CN114837613A - Sand control fracturing ball injection sliding sleeve - Google Patents

Abstract

The present application provides a ball sliding sleeve for sand control and fracturing. Wherein, the sand control fracturing ball-throwing sliding sleeve includes an outer shell, and the outer wall of the outer shell is provided with a sand control production channel and a fracturing channel at intervals, and the sand control production channel includes a plurality of sand control channels distributed in the circumferential direction of the outer shell. Each of the sand control through-holes is provided with a sand control screen, the fracturing channel includes a plurality of fracturing channels distributed in the circumferential direction of the outer shell; the sliding sleeve in the fracturing ball seat and the fracturing ball The inner sliding sleeve of the fracturing ball seat is sealed and connected to the inside of the outer casing, and is fixed with the outer casing through a first shearing connector, so that the inner sliding sleeve of the fracturing ball seat is located in the shelter. The first position of the fracturing channel; the inner sliding sleeve of the sand control ball seat and the sand control ball seat, the inner sliding sleeve of the sand control ball seat is sealingly connected to the inside of the outer casing, and is connected to the outer casing through a second shearing connector The body is fixed, so that the inner sliding sleeve of the sand control ball seat is located at a second position that shields the sand control production channel.

Description

Sand control fracturing ball sliding sleeve

technical field

The present application relates to the technical field of oil wells, in particular to a ball sliding sleeve for sand control and fracturing.

Background technique

At present, for the stimulation and reconstruction of unconventional oil and gas wells such as low permeability and tight oil and gas, shale gas, etc., techniques such as graded ball sliding sleeve, full-bore sliding sleeve or combined casing + bridge plug perforation are mostly used. However, in the production process of many wells, phenomena such as sand production are often encountered, causing the wellbore to be blocked and unable to produce normally.

Therefore, there is an urgent need to provide a ball sliding sleeve for sand control and fracturing, so as to provide the sand control function during production while implementing stimulation measures such as fracturing.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present application is to provide a ball sliding sleeve for sand control and fracturing, so as to realize the sand control function during production while implementing stimulation measures such as fracturing.

In order to solve the above-mentioned technical problems, the embodiments of the present application provide the following technical solutions:

The present application provides a ball sliding sleeve for sand control and fracturing. The ball sliding sleeve for sand control and fracturing includes: an outer casing, and opposite first ends and second ends of the outer casing are sealed and fixedly connected with a female joint and a male joint, respectively, The outer wall of the outer casing is provided with sand control production channels and fracturing channels at intervals along the first direction, the sand control production channel includes a plurality of sand control through holes distributed in the circumferential direction of the outer casing, each of the sand control through holes Sand control screens are respectively arranged inside, and the fracturing channel includes a plurality of fracturing channels distributed in the circumferential direction of the outer casing;

The inner sliding sleeve of the fracturing ball seat and the fracturing ball seat, the inner sliding sleeve of the fracturing ball seat is sealed and connected to the inside of the outer casing, and is fixed with the outer casing through a first shearing connector, so that all the The inner sliding sleeve of the fracturing ball seat is located at a first position blocking the fracturing channel, and the fracturing ball seat is sealed and fixedly installed in the inner sliding sleeve of the fracturing ball seat;

The inner sliding sleeve of the sand control ball seat and the sand control ball seat, the inner sliding sleeve of the sand control ball seat is sealed and connected to the inside of the outer casing, and is fixed with the outer casing through a second shearing connector, so that the sand control ball The inner sliding sleeve of the seat is located at a second position to block the sand control production channel, and the sand control ball seat is sealed and fixedly installed in the inner sliding sleeve of the sand control ball seat;

When the first shear connecting piece is disconnected, the sliding sleeve in the fracturing ball seat slides to a third position away from the fracturing tunnel and in contact with the male joint, and then when the second shearing When the connecting piece is disconnected, the inner sliding sleeve of the sand control ball seat slides to a fourth position away from the sand control production channel, shielding the fracturing channel, and in contact with the inner sliding sleeve of the fracturing ball seat;

Wherein, the first direction is a direction from the first end to the second end.

In some variant embodiments of the first aspect of the present application, the sand control screen includes:

an installation ring, adapted and fixed to the sand control through hole;

The main body of the sieve is fixed to the inner hole of the installation ring, and the main body of the sieve is at least one filter beads which are arranged in sequence in at least one section of the inner hole according to the shape of the section and fixed to each other. Layer screen structure, pores are formed between adjacent filter beads.

In some modified embodiments of the first aspect of the present application, the mounting ring is threadedly connected to the sand control through hole, and a plurality of mounting holes are uniformly distributed on the outer end surface of the mounting ring in the circumferential direction.

In some modified embodiments of the first aspect of the present application, while the plurality of sand control channels are distributed in the circumferential direction of the outer casing, they are arranged in multiple rows in the axial direction of the outer casing, and any two adjacent rows of shafts are arranged in multiple rows. Stagger in position.

In some modified embodiments of the first aspect of the present application, a first annular groove is provided on the outer wall of the inner sliding sleeve of the sand control ball seat and at one end close to the male joint, and an elastic limit ring is sleeved in the annular groove. , the elastic limit ring is provided with an axially through opening in the circumferential direction;

A second annular groove is provided on the inner wall of the outer casing and close to the second end;

Wherein, when the inner sliding sleeve of the fracturing ball seat is in the first position, the elastic limiting ring is in a compressed state, and when the inner sliding sleeve of the fracturing ball seat is in the third position, the The elastic limiting ring is located in the second ring groove and is expanded to fit in the second ring groove.

In some modified embodiments of the first aspect of the present application, the end face of the second annular groove away from the male joint is a first tapered surface, and the diameter thereof is equal to the inner diameter of the outer casing along the first direction The size gradually increases to a size equal to the diameter of the second ring groove.

In some modified implementations of the first aspect of the present application, two first anti-rotation lugs are symmetrically arranged on the end surface of the inner sliding sleeve of the fracturing ball seat toward the second sliding sleeve, and the inner sliding sleeve of the sand control ball seat is oriented toward the end surface of the second sliding sleeve. Two second anti-rotation lugs staggered with circumferential positions of the two first anti-rotation lugs are symmetrically arranged on the end face of the sliding sleeve in the fracturing ball seat;

Two third anti-rotation lugs are symmetrically arranged on the end face of the first sliding sleeve facing the male joint, and two third anti-rotation lugs are symmetrically arranged on the end face of the male joint facing the inner sliding sleeve of the fracturing ball seat. Two fourth anti-rotating lugs with staggered circumferential positions of the rotating lugs;

When the inner sliding sleeve of the fracturing ball seat is in the third position, the two third anti-rotation lugs are respectively inserted between the gaps on both sides of the two fourth anti-rotation lugs;

When the inner sliding sleeve of the sand control ball seat is in the fourth position, the two second anti-rotation lugs are respectively inserted between the two side gaps of the two first anti-rotation lugs.

In some modified embodiments of the first aspect of the present application, a first keyway is provided on the inner wall of the inner sliding sleeve of the fracturing ball seat and one end close to the female joint, and the inner sliding sleeve of the sand control ball seat is inside and close to the inner wall of the sliding sleeve. One end of the female connector is provided with a second keyway, and the first keyway and the second keyway are respectively used to cooperate with a sliding sleeve switch tool.

In some modified embodiments of the first aspect of the present application, the inner holes of the inner sliding sleeve of the fracturing ball seat and the inner sliding sleeve of the sand control ball seat are respectively provided with a second conical surface at one end facing the first end, The diameter of the second conical surface is gradually increased along the opposite direction of the first direction from the size equal to the inner sliding sleeve of the fracturing ball seat or the inner sliding sleeve of the sand control ball seat;

The end faces of the first keyway and the second keyway close to the second end are a third tapered surface, and the diameter of the first keyway along the first direction is equal to the size of the inner diameter of the first keyway or the second keyway Gradually reduce to the size equal to the inner sliding sleeve of the fracturing ball seat or the inner sliding sleeve of the sand control ball seat.

In some modified embodiments of the first aspect of the present application, the sand control ball seat and the fracturing ball seat are made of drillable cast iron or soluble metal materials.

Compared with the prior art, the sand control fracturing ball casting sliding sleeve provided by the present application is provided by arranging a sand control production channel and a fracturing channel on the outer casing, and arranging a fracturing ball seat inner sliding sleeve and a fracturing ball seat inside the outer casing. combination, and the combination of the inner sliding sleeve of the sand control ball seat and the sand control ball seat, so that the sand control fracturing ball sliding sleeve provided in this embodiment can throw the sand control ball into the sand control ball seat while having the function of ball shooting and fracturing. Opening the sand control production channel and producing through the sand control production channel can play a role in sand control.

Description of drawings

The above and other objects, features and advantages of exemplary embodiments of the present application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown by way of example and not limitation, and like or corresponding reference numerals refer to like or corresponding parts, wherein:

Fig. 1 schematically shows a half-section structure of the sand control fracturing ball-throwing sliding sleeve provided in an embodiment of the present invention in an initial state, wherein the inner sliding sleeve of the fracturing ball seat is in the first position, and the inner sliding sleeve of the sand control ball seat is in the first position. in the second position;

Fig. 2 schematically shows a half-section structure diagram of a part of the sand control fracturing ball sliding sleeve provided in an embodiment of the present invention in an initial state;

3 schematically shows a half-section structure diagram of another part of the sand control fracturing ball-throwing sleeve provided in an embodiment of the present invention in an initial state;

Figure 4 schematically shows a half-section structure of the sand control fracturing ball-throwing sleeve provided by the embodiment of the present invention under the fracturing construction state, wherein the inner sliding sleeve of the fracturing ball seat is in the third position, and the inner sliding sleeve of the sand control ball seat is in the third position. The sliding sleeve is in the second position;

Fig. 5 schematically shows a half-section structure diagram of the sand control fracturing ball-throwing sleeve provided in the embodiment of the present invention in the fracturing construction displacement stage, wherein the inner sliding sleeve of the fracturing ball seat is in the third position, and the sand control ball is in the third position. The sliding sleeve in the seat is in the fourth position;

Fig. 6 schematically shows a schematic front view of the structure of the outer casing of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

FIG. 7 schematically shows a left-view structural diagram of the outer casing of the sand control fracturing ball sliding sleeve provided by an embodiment of the present invention;

FIG. 8 schematically shows a cross-sectional structure diagram of the A-A section in FIG. 7;

Fig. 9 schematically shows the front view of the structure of the sand control screen of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

FIG. 10 schematically shows a left-view structural diagram of the sand control screen for sand control fracturing ball sliding sleeve provided by the embodiment of the present invention

FIG. 11 schematically shows a cross-sectional structure diagram of the A-A section in FIG. 10;

Fig. 12 schematically shows the front view of the sliding sleeve in the fracturing ball seat of the sand control fracturing ball casting sliding sleeve provided by the embodiment of the present invention;

Fig. 13 schematically shows a cross-sectional structure diagram of the A-A section in Fig. 12;

FIG. 14 schematically shows a schematic cross-sectional structure diagram of the B-B section in FIG. 13;

FIG. 15 schematically shows a cross-sectional structure diagram of the C-C section in FIG. 13;

Fig. 16 schematically shows a left-view structural diagram of the fracturing ball seat of the sand-control fracturing ball-throwing sliding sleeve provided by the embodiment of the present invention;

Fig. 17 schematically shows a cross-sectional structure diagram of the A-A section in Fig. 16;

Fig. 18 schematically shows the right side structural diagram of the fracturing ball seat of the sand control fracturing ball throwing sliding sleeve provided by the embodiment of the present invention;

Fig. 19 schematically shows a schematic front view of the structure of the inner sliding sleeve of the sand control ball seat of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

FIG. 20 schematically shows a cross-sectional structure diagram of the A-A section in FIG. 19;

FIG. 21 schematically shows a cross-sectional structure diagram of the B-B section in FIG. 19;

FIG. 22 schematically shows a left-view structural schematic diagram of the sand control ball seat of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

Fig. 23 schematically shows the cross-sectional structure diagram of the A-A section in Fig. 22;

Fig. 24 schematically shows a schematic view of the structure of the right side of the sand control ball seat of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

Fig. 25 schematically shows a schematic front view of the structure of the male joint of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

Fig. 26 schematically shows a left view structural diagram of the male joint of the sand control fracturing ball sliding sleeve provided by the embodiment of the present invention;

Fig. 27 schematically shows a cross-sectional structure diagram of the A-A section in Fig. 26;

Description of reference numbers:

Outer shell 1, first end 1a, second end 1b, sand control through hole 101, fracturing channel 102, first trapezoidal thread 103, second trapezoidal thread 104, first shear hole 105, second shear hole 106, The first tightening hole 107, the second tightening hole 108, the female joint 2, the male joint 3, the sand control screen 4, the inner sliding sleeve of the fracturing ball seat 5, the first shearing installation hole 501, the third trapezoidal thread 502, The fracturing ball seat 6, the first shear connector 7, the inner sliding sleeve of the sand control ball seat 8, the second shear mounting hole 801, the fourth trapezoidal thread 802, the sand control ball seat 9, the second shear connector 10, the first A set screw 11, a first seal 12, a second set screw 13, a second seal 14, a third seal 15, a fourth seal 16, a fifth seal 17, a sixth seal 18, a ball The seat cone hole 19, the first installation hole 20, the installation ring 21, the filter beads 22, the second installation hole 23, the first ring groove 24, the elastic limit ring 25, the second ring groove 26, the first cone surface 26a, the first An anti-rotation lug 27, a second anti-rotation lug 28, a third anti-rotation lug 29, a first keyway 30, a second keyway 31, a fracturing ball 32, a sand control ball 33, a third sealing groove 34, a fourth The sealing groove 35 , the fourth anti-rotation lug 36 , the fifth sealing groove 37 , the sixth sealing groove 38 , and the first direction X.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the usual meanings understood by those skilled in the art to which this application belongs.

In the prior art, due to the requirement of fracturing displacement (generally the minimum requirement is more than 3 m ³ /min) for conventional fracturing sliding sleeves, the opening of the fracturing channel cannot be too small. To play the role of sand control; if in order to play the role of sand control, the sand control screen, slotted tube and other products are directly used to complete the well, because the screen itself is connected inside and outside, the stimulation measures such as fracturing cannot be implemented; there is also a kind of The solution is to use the sand control screen welded on the outer side of the outer casing to control the sand, but this will inevitably increase the maximum outer diameter of the tool, which will cause the problem of difficulty in running the tool into the wellbore. , it will cause the problem of reducing the number of segments in a wellbore of the same size. Therefore, there is an urgent need to develop a tool that can provide sand control during production while implementing stimulation measures such as fracturing.

Example

In order to solve the problems in the prior art, please refer to the accompanying drawings 1 to 27. As shown in the figures, an embodiment of the present invention proposes a sand control fracturing ball sliding sleeve, the sand control fracturing ball sliding sleeve includes: The outer casing 1, the opposite first end 1a and the second end 1b of the outer casing 1 are sealed and fixedly connected with the female connector 2 and the male connector 3 respectively, and the outer wall of the outer casing 1 is spaced along the first direction X. Sand control production channel and fracturing channel, the sand control production channel includes a plurality of sand control through holes 101 distributed in the circumferential direction of the outer casing 1, and each sand control through hole 101 is respectively provided with a sand control screen 4, so The fracturing channel includes a plurality of fracturing holes 102 distributed in the circumferential direction of the outer casing 1; the inner sliding sleeve 5 of the fracturing ball seat and the fracturing ball seat 6, and the inner sliding sleeve 5 of the fracturing ball seat is sealed and connected inside the outer casing 1, and is fixed with the outer casing 1 through the first shear connector 7, so that the inner sliding sleeve 5 of the fracturing ball seat is located at the first position to block the fracturing channel, The fracturing ball seat 6 is sealed and fixedly installed in the inner sliding sleeve 5 of the fracturing ball seat; the inner sliding sleeve 8 of the sand control ball seat and the sand control ball seat 9 are sealed and connected to the inner sliding sleeve 8 of the sand control ball seat. The inner part of the outer casing 1 is fixed to the outer casing 1 through the second shear connector 10, so that the inner sliding sleeve 8 of the sand control ball seat is located at the second position to block the sand control production channel, and the sand control ball seat The ball seat 9 is sealed and fixedly installed in the inner sliding sleeve 8 of the sand control ball seat; when the first shear connecting piece 7 is disconnected, the inner sliding sleeve 5 of the fracturing ball seat slides away from the fracturing The third position where the channel 102 is in contact with the male joint 3, and when the second shear connector 10 is disconnected, the inner sliding sleeve 8 of the sand control ball seat slides away from the sand control production channel and shields the The fourth position where the fracturing channel is in contact with the sliding sleeve 5 in the fracturing ball seat; wherein, the first direction X is the direction from the first end 1a to the second end 1b.

The sand control fracturing ball sliding sleeve provided in this embodiment can be used, but not limited to, in the multi-stage fracturing process of vertical wells and horizontal wells in unconventional oil and gas wells such as low permeability, tight oil and gas, and shale oil and gas, and can also be used for selective production of near and Stimulation measures wells; in the specific implementation, the reservoir is divided into several sections according to the requirements of geology and technology, the packer is installed in the corresponding position, and the sand control fracturing ball slip provided in this embodiment is installed in the corresponding position that needs to be reformed. The casing, the packer and the sand control fracturing ball sliding casing are connected to form a string of pipe strings. After the completion pipe string is lowered to the design position, the packer is set by pressing and other operations; please refer to Figure 4, as shown in the figure, During the fracturing operation, the fracturing ball 32 corresponding to the fracturing ball seat 6 in the sliding sleeve 5 of the fracturing ball seat is put into the fracturing ball seat from the wellhead, and reaches the position of the fracturing ball seat 6 after pumping. The fracturing ball seat 6 is sealed by line contact, and then the first shear connector 7 is disconnected after holding down the pressure, and the sliding sleeve 5 in the fracturing ball seat is slid from the first position to the third position, and the fracturing channel is connected. , the fracturing construction can be carried out; please refer to Figure 5, as shown in the figure, in the replacement stage of fracturing construction in this section, put the sand control ball 33 corresponding to the sand control ball seat 9 in the sand control ball seat inner sliding sleeve 8, and After pumping, the position of the sand control ball seat 9 is reached, the sand control ball 33 and the sand control ball seat 9 are sealed by line contact, and then the second shear connector 10 is disconnected after pressing down, and the inner sliding sleeve 8 of the sand control ball seat is made by Slide the second position to the fourth position, and close the fracturing channel while opening the sand control production channel. The formation oil and gas can enter the wellbore for production through the sand control production channel, and the sand control screen 4 passing through the sand control production channel can effectively play the role of sand control; After the fracturing construction is completed, after the fracturing ball seat 6 and the sand control ball seat 9 are drilled or dissolved, the sliding sleeve switch tool can be used to switch the inner sliding sleeve 5 of the fracturing ball seat and the inner sliding sleeve 8 of the sand control ball seat.

Specifically, please refer to Figures 6 to 8. As shown in the figures, the outer casing 1 can be made of 42CrMo/35CrMo alloy steel material, which has opposite first ends 1a and second ends 1b. The inner wall of the first end 1a of the Set the screw 11 to further fix the outer casing 1 and the female connector 2. The first tightening hole 107 on the outer casing 1 can be located on the side of the first trapezoidal thread 103 away from the second end 1b, and the female connector 2 is located on the outer casing. The outer wall of the inner end of the 1 is provided with a first sealing groove for installing the first sealing member 12. The first sealing groove can be located on the side of the first trapezoidal thread 103 close to the second end 1b. The outer casing 1 and the female connector 2 The first sealing member 12 is used for sealing connection; the second end 1b of the outer casing 1 is provided with a second trapezoidal thread 104 for connecting the male joint 3, and the outer casing 1 and the male joint 3 are correspondingly provided with four second tightening screws. The hole 108 is used to connect the second set screw 13 to realize the further fixing of the outer casing 1 and the male joint 3. The inner wall of the outer casing 1 and the second trapezoidal thread 104 located on the side close to the first end 1a are provided for installation In the second sealing groove of the second sealing member 14, the outer casing 1 and the male joint 3 are sealedly connected through the second sealing member 14; There are sand control production channels and fracturing channels. The sand control production channel includes a plurality of axial sand control through holes 101 distributed in the casing. The sand control through holes 101 are connected to the production layer. The sand control through holes 101 are installed with sand control screens 4, which can be used in the sand control through holes 101. It plays the role of sand control in production, and will not affect the maximum outer diameter and inner diameter of the sand control fracturing ball sliding sleeve provided in this embodiment; The pore channel 102, the fracturing pore channel 102 can be specifically set as long strip holes, the number of which can be but not limited to 8, and the fracturing pore channel 102 is communicated with the production layer. During the fracturing construction, the fracturing fluid and proppant can be used. The pay zone is entered through the fracturing tunnel 102 .

Specifically, please refer to Figures 12 to 13. As shown in the figures, the inner sliding sleeve 5 of the fracturing ball seat can be made of 42CrMo/35CrMo alloy steel material; the middle part of the outer wall of the inner sliding sleeve 5 of the fracturing ball seat There are 8 first shear mounting holes 501 evenly distributed in the circumferential direction, and the depth of the first shear mounting holes 501 can be 4 mm. There are 8 first shear holes 105 correspondingly opened on the sides, which are used to cooperate with the first shear installation holes 501 to connect the first shear connector 7 to fix the inner sliding sleeve 5 of the fracturing ball seat to the first shear hole in the outer shell 1. Position, as shown in Figures 1 and 3, when the sliding sleeve 5 in the fracturing ball seat is in the first position, the sliding sleeve 5 in the fracturing ball seat corresponds to and blocks the fracturing channel; the sliding sleeve in the fracturing ball seat The inner wall of 5 and the side close to the second end 1b are provided with a third trapezoidal thread 502, which is used to connect the fracturing ball seat 6; during the fracturing operation, the fracturing ball 32 is put into the wellhead to make the fracturing ball 32 and the fracturing ball 32 and the fracturing ball 32. The fracturing ball seat 6 is sealed, and the first shear connector 7 is disconnected after holding down the pressure. As shown in FIG. 4 , the sliding sleeve 5 in the fracturing ball seat can slide in the direction away from the fracturing hole 102 to connect with the male joint 3 . At the third position of contact, the fracturing channel is in communication with the production layer at this time; the outer wall of the sliding sleeve 5 in the fracturing ball seat and both ends of the first end 1a and the second end 1b are respectively provided with a third seal for installing the third seal. The third sealing groove 34 of the fracturing ball seat 15, the inner sliding sleeve 5 of the fracturing ball seat is sealed with the outer casing 1 through the third sealing element 15; the inner wall of the inner sliding sleeve 5 of the fracturing ball seat is located at the third trapezoidal thread 502 close to the first One side of the end 1a is provided with a fourth sealing groove 35 for installing the fourth sealing member 16 , and the inner sliding sleeve 5 of the fracturing ball seat is sealedly connected to the fracturing ball seat 6 through the fourth sealing member 16 .

Specifically, please refer to accompanying drawings 19 to 21. As shown in the figures, the inner sliding sleeve 8 of the sand control ball seat can be made of 42CrMo/35CrMo alloy steel material; the middle part of the outer wall of the inner sliding sleeve 8 of the sand control ball seat is axially There are 8 second shear installation holes 801 evenly distributed, and the depth of the second shear installation holes 801 can be 4mm. There are 8 second shear holes 106 corresponding to the sides, which are used to cooperate with the second shear mounting holes 801 to connect the second shear connector 10 to fix the inner sliding sleeve 8 of the sand control ball seat to the second position in the outer casing 1 , as shown in Figures 1 and 2, when the inner sliding sleeve 8 of the sand control ball seat is in the second position, the inner sliding sleeve 8 of the sand control ball seat corresponds to and blocks the sand control production channel; the inner wall of the inner sliding sleeve 8 of the sand control ball seat and The side close to the second end 1b is provided with a fourth trapezoidal thread 802, which is used to connect the sand control ball seat 9; in the replacement stage of fracturing construction, the sand control ball 33 is put into the wellhead to seal the sand control ball 33 and the sand control ball seat 9, and the pressure is suppressed. After disconnecting the second shear connector 10, as shown in FIG. 5, the sliding sleeve 8 in the sand control ball seat can slide from the second position to the direction away from the sand control production channel to block the fracturing channel and connect with the fracturing ball seat. The fourth position where the inner sliding sleeve 5 is in contact, the sand control production channel is open at this time; the outer wall of the inner sliding sleeve 8 of the sand control ball seat and the two ends near the first end 1a and the second end 1b are respectively provided with a fifth seal for installing The fifth sealing groove 37 of 17, the inner sliding sleeve 8 of the sand-proof ball seat is sealedly connected with the outer casing 1 through the fifth seal 17; A sixth sealing groove 38 for installing the sixth sealing member 18 is provided on one side, and the inner sliding sleeve 8 of the sand-proof ball seat is sealedly connected to the sand-proof ball seat 9 through the sixth sealing member 18 .

Specifically, referring to Figures 16 to 18 and Figures 22 to 24, the fracturing ball seat 6 and the sand control ball seat 9 can be processed with drillable cast iron or soluble metal materials, and the fracturing ball seat 6 and the sand control ball seat 9 can be processed with drillable cast iron or soluble metal materials. The side of the ball seat 9 facing the first end 1a is provided with a 60° ball seat tapered hole 19 for the seating of the corresponding fracturing ball 32 or sand control ball 33; the fracturing ball seat 6 and the sand control ball seat 9 face the first. There are four first installation holes 20 evenly distributed on one side of the two ends 1b, so that the ball seat can be installed into the corresponding inner sliding sleeve 5 of the fracturing ball seat or the inner sliding sleeve 8 of the sand control ball seat by using tools; the fracturing ball seat The side of the outer wall of 6 close to the second end 1b is provided with a thread that cooperates with the third trapezoidal thread 502 to realize the connection with the inner sliding sleeve 5 of the fracturing ball seat; the outer wall of the sand control ball seat 9 is close to the second end 1b. The side is provided with a thread that cooperates with the fourth trapezoidal thread 802 to realize the connection with the inner sliding sleeve 8 of the sand control ball seat; wherein, the sand control ball seat 9 and the fracturing ball seat 6 can adopt a 1/16 step difference, that is, the sand control ball seat 9 Compared with the size of the fracturing ball seat 6, it is 1/16 inch larger, and this design can improve the grading capacity.

It should be noted that, the descriptions of the positions of each structure relative to the first end 1a and the second end 1b above and below are all defined by the relative position of the structure and the outer casing 1 after installation; The cutting and connecting pieces can all be shear pins, and each of the above-mentioned seals can be O-rings, or a combination of two retaining rings and O-rings, and it is necessary to ensure that the grooves of the retaining rings face the O-rings.

According to the above list, the embodiment of the present invention proposes a sand control fracturing ball throwing sliding sleeve, by setting the sand control production channel and the fracturing channel on the outer casing 1, and setting the inner sliding sleeve 5 and the fracturing ball seat inside the outer casing 1 The combination of the fracturing ball seat 6 and the combination of the inner sliding sleeve 8 of the sand control ball seat and the sand control ball seat 9 can enable the sand control fracturing ball sliding sleeve provided in this embodiment to have the function of ball shooting and fracturing, and can also provide sand control and fracturing. The ball seat 9 is put into the sand control ball to open the sand control production channel, and the production through the sand control production channel can play the role of sand control.

Further, referring to FIG. 1 , in the technical solution adopted in the present invention, the structure of the above-mentioned sand control screen 4 specifically includes: an installation ring 21 and a screen main body, wherein the installation ring 21 is an annular structure, and its outer shape is suitable for Matching the shape of the sand control through hole 101, the shape of the sand control through hole 101 may be a circle, the corresponding mounting ring 21 is set as a circular ring structure, and the outer wall of the mounting ring 21 and the inner wall of the sand control through hole 101 are correspondingly provided with threads to The mounting ring 21 is threadedly connected with the sand control through hole 101, and the outer end face of the mounting ring 21 is provided with a plurality of second mounting holes 23, so that the mounting ring 21 can be easily installed in the sand control through hole 101 of the outer casing 1 by using a tool; The main body of the screen is fixed to the inner hole of the installation ring 21. The main body of the screen is formed by sintering or welding a plurality of filter beads 22 to form at least one layer of screen mesh structure. The pores between the adjacent filter beads 22 can allow the formation of oil and gas to pass through to enter the wellbore The production is carried out internally. The multiple filter beads 22 of the screen main body can achieve sand control through blocking. The filter beads 22 can be made of stainless steel or nickel alloy materials. The outer diameter of the filter beads 22 can be selected according to the sand control needs. 10, 12, 14 , 16, 22, 30 meshes, etc.; it should be noted that after the sand control screen 4 is installed in the sand control through hole 101, the outer end surface of the sand control screen 4 does not protrude from the outer wall of the outer casing 1, and does not occupy the interior of the outer casing 1. , the outer installation space, that is, it will not cause the increase of the maximum outer diameter of the sand control fracturing ball sliding sleeve tool, and has no effect on the number of segments of the inner cylinder.

Further, referring to FIG. 6 and FIG. 8 , in the technical solution adopted in the present invention, while the plurality of sand control channels 101 are evenly distributed in the circumferential direction of the outer casing 1, they can also be distributed in multiple rows in the axial direction of the outer casing 1. Each row may include 4 sand control channels 101 arranged at intervals, and two adjacent rows of sand control channels 101 are staggered by 45°. The specific number of rows of sand control channels 101 can be determined according to the equivalent area of the inner hole, which is not specifically limited here. .

Further, referring to FIG. 3 , FIG. 4 , FIG. 8 and FIG. 12 , in order to realize the limit of the sliding sleeve 5 in the fracturing ball seat when the sliding sleeve 5 in the fracturing ball seat slides to the third position , in the technical solution adopted in the present invention, a first ring groove 24 is provided on the outer wall of the sliding sleeve 5 in the fracturing ball seat and near the first end 1a, and the first ring groove 24 is used for installing the elastic limit ring 25 , the elastic limit ring 25 is provided with an axial through opening in the axial direction, that is, the cross-sectional shape of the elastic limit ring 25 is "C" shape, and the cross section here refers to the axis perpendicular to the sliding sleeve 5 in the fracturing ball seat By setting the opening, it is convenient to set the elastic limit ring 25 in the first ring groove 24. Correspondingly, a second ring groove 26 is provided on the inner wall of the outer casing 1 and close to the second end 1b. The second annular groove 26 is located on the side of the second trapezoidal thread 104 close to the first end 1a, and the second sealing groove can be disposed in the second annular groove 26 and located on the side close to the second trapezoidal thread 104; elastic limit The ring 25 has a certain elasticity. When the sliding sleeve 5 in the fracturing ball seat is in the first position, the elastic limit ring 25 is in a compressed state, and when the sliding sleeve 8 in the sand control ball seat is in the third position, the elastic limit ring 26 Located in the second ring groove 26, since the diameter of the second ring groove 26 is larger than the diameter of the outer casing 1, the elastic limit ring 26 can be expanded to a certain extent, and is adapted to the second ring groove 26, so that it can be pressed against The position of the sliding sleeve 5 in the fracturing ball seat is limited, and when the fracturing ball seat 6 is drilled or dissolved, when the sliding sleeve in the fracturing ball seat is switched by the sliding sleeve switching tool, only a certain force needs to be applied. It can overcome the holding force of the elastic limit ring 26 and the second ring groove 24; in order to prevent the second ring groove 24 from jamming the elastic limit piece 26, as shown in FIG. The end surface of one end 1a is set as a first conical surface 26a, and the diameter of the first conical surface 26a gradually increases along the first direction X from the size equal to the diameter of the inner hole of the outer casing 1 to equal to the diameter of the second annular groove 24 size, so that the first tapered surface 26a can be used to play a transitional role between the second annular groove 24 and the inner hole of the outer casing 1 on the side of the second annular groove 24 close to the first end 1a, which can realize the second annular groove 24. The elastic limiting ring 25 and the inner sliding sleeve 5 of the fracturing ball seat can be restrained from the position of the elastic limiting ring 25 and the inner sliding sleeve 5 of the fracturing ball seat can be released under the condition of applying a certain force.

Further, in the technical solution adopted in the present invention, two mutually symmetrical first anti-rotation lugs 27 are respectively provided on the end face of the sliding sleeve 5 in the fracturing ball seat toward the inner sliding sleeve 8 of the sand-control ball seat. The lugs 27 can be two arc-shaped lugs with the same diameter as the inner sliding sleeve 5 of the fracturing ball seat, and correspondingly, two symmetrical lugs are arranged on the end face of the sliding sleeve 8 in the sand control ball seat toward the inner sliding sleeve 5 of the fracturing ball seat. The second anti-rotation lugs 28, the second anti-rotation lugs 28 can be two arc-shaped lugs with the same diameter as the inner sliding sleeve 8 of the sand-proof ball seat, and the two second anti-rotation lugs 28 and the two third The circumferential positions of an anti-rotation lug 27 are staggered, and the axial dimensions of the first anti-rotation lug 27 and the second direction lug 28 can be set to be equal, when the inner sliding sleeve 8 of the sand control ball seat is in the fourth position , the two second anti-rotation lugs 28 are respectively inserted between the gaps on both sides of the two first anti-rotation lugs 27, so that when the sand-proof ball seat 9 is drilled and removed, it can limit the sliding sleeve in the sand-proof ball seat 8. The effect of rotation, more specifically, the circumferential size of the two second anti-rotation lugs 28 can be adapted to the circumferential size of the gap between the two first anti-rotation lugs 27; Two symmetrical third anti-rotation lugs 29 are provided on the end face of the inner sliding sleeve 5 of the fracturing ball seat toward the male joint 3 , and the third anti-rotation lugs 29 may be two equal in diameter to the inner sliding sleeve 5 of the fracturing ball seat. Arc-shaped lugs, and correspondingly, two symmetrical fourth anti-rotation lugs 36 can be provided on the end face of the male joint 3 facing the inner sliding sleeve 5 of the fracturing ball seat. The fourth anti-rotation lugs 36 can be connected to the male joint 3 Two arc-shaped lugs of equal diameter, and the circumferential positions of the two third anti-rotation lugs 29 and the two fourth anti-rotation lugs 36 are staggered, and the third anti-rotation lugs 29 and the fourth anti-rotation lugs The axial dimensions of the pieces 36 can be set to be equal in size. When the sliding sleeve 5 in the fracturing ball seat is in the third position, the two third anti-rotation lugs 29 are respectively inserted into the two fourth anti-rotation lugs 36 . between the two sides of the gap, so that when the fracturing ball seat 6 is drilled and removed, it can limit the rotation of the sliding sleeve 5 in the fracturing ball seat. More specifically, the circumferential size of the two third anti-rotation lugs 29 The circumferential dimensions of the gap between the two fourth anti-rotation lugs 36 can be adapted, respectively.

Further, referring to Figure 13 and Figure 20, in order to use the sliding sleeve switch tool to slide the inner sliding sleeve 5 of the fracturing ball seat and the sand control ball seat 9 after the fracturing ball seat 6 and the sand control ball seat 9 are drilled or dissolved. The sleeve 8 is switched on and off. In the technical solution adopted in the present invention, a first keyway 30 is provided on the inner wall of the sliding sleeve 5 in the fracturing ball seat and at one end close to the female joint 2, and inside the sliding sleeve 6 in the sand control ball seat and A second keyway 31 is provided at one end close to the female joint 2, and the first keyway 30 and the second keyway 31 can be respectively used to cooperate with the sliding sleeve switch tool; 5 and the inner hole of the sand control ball seat inner sliding sleeve 8 and one end facing the first end 1a are respectively provided with a second conical surface, and the diameter of the second conical surface is reversed along the first direction X by sliding with the fracturing ball seat. The size of the sleeve 5 or the sliding sleeve 8 in the sand-proof ball seat is gradually increased, which can be used to guide the sliding sleeve switch tool, and at the same time can reduce the effect of liquid erosion; the first keyway 30 and the second keyway 31 can be close to the second end 1b The end face is set as a third conical surface, and the diameter of the third conical surface is gradually reduced along the first direction X due to the equal size of the inner diameter of the first keyway 30 or the second keyway 31 to the same size as the sliding sleeve 5 or the inner diameter of the fracturing ball seat. Sand control ball seat inner sliding sleeve 8 equal dimensions.

Specifically, the assembly process of the sand control fracturing ball sliding sleeve provided in this embodiment is as follows:

Install the sixth sealing member 18 into the sixth sealing groove 38 on the inner wall of the sand control ball seat inner sliding sleeve 8, install the sand control ball seat 9 to the end of the sand control ball seat inner sliding sleeve 8 close to the second end 1b, and connect with the first end of the sand control ball seat inner sliding sleeve 8. The four trapezoidal threads 802 are screwed together, and the two fifth seals 17 are respectively installed in the two fifth sealing grooves 37 on the outer wall of the inner sliding sleeve 8 of the sand-proof ball seat and the two ends are respectively set, and then the inner sliding sleeve 8 of the sand-proof ball seat is installed. To the inner hole of the second end 1b of the outer casing 1, align the eight second shear mounting holes 801 of the inner sliding sleeve 8 of the sand control ball seat with the eight second shear holes 106 at the corresponding positions of the outer casing 1, And connected and fixed by 8 second shear connectors 10;

Install the first sealing member 12 into the first sealing groove of the outer wall of the female connector 2, connect the female connector 2 with the first trapezoidal thread 103 of the first end 1a of the outer casing 1, and fasten the four first The screws 11 are installed into the corresponding first fastening holes 107 on the outer casing 1 and the female connector 2, and the sand control screen 4 is installed into the sand control through hole 101 of the outer casing 1 by a tool. Sand control through hole 101 screw connection and fix;

Install the fourth seal 16 into the fourth sealing groove 35 on the inner wall of the inner wall of the fracturing ball seat 5, and connect the fracturing ball seat 6 and the inner sliding sleeve 5 of the fracturing ball seat to the third trapezoid of the second end 1b. The thread 502 is threaded, and the two third seals 15 are respectively installed in the two third sealing grooves 34 on the outside of the inner sliding sleeve 5 of the fracturing ball seat and at two ends respectively, and then the inner sliding sleeve 5 in the fracturing ball seat is installed to In the inner hole of the second end 1b of the outer casing 1, during installation, it is required that the two first anti-rotation lugs 27 on the fracturing ball seat inner sliding sleeve 5 near the first end 1a and the sand-proof ball seat inner sliding sleeve 8 are separated. The two second anti-rotation lugs 28 are staggered in the circumferential direction, and then the eight first shear mounting holes 501 of the sliding sleeve 5 in the fracturing ball seat and the corresponding eight first shear holes 105 on the outer shell 1 are one by one. Correspondingly, and fixedly connected by the first shear connector 7;

Install the second sealing member 14 into the second sealing groove on the inner wall of the outer casing 1, and connect the male joint 3 with the second trapezoidal thread 104 of the second end 1b of the outer casing 1. When installing, it is required to fracturing the ball seat. The two third anti-rotation lugs 29 on the sliding sleeve 5 near the second end 1b are circumferentially staggered with the two fourth anti-rotation lugs 36 of the male connector 3, and then install the four second set screws 13 to the housing The four second fixing holes 108 corresponding to the body 1 and the male connector 3 are used to fix the male connector 3 . The tool assembly is now complete.

It should be noted that, in the description of this specification, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description. Rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present invention; the terms "connecting", "installing", "fixing", etc. should all be In a broad sense, for example, "connection" may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a ball sliding sleeve for sand control fracturing is characterized in that, comprising: an outer casing, the opposite first and second ends of the outer casing are sealed and fixedly connected with the female joint and the male joint, respectively, the outer wall of the outer casing is provided with sand control production channels and fracturing channels at intervals along the first direction, The sand control production channel includes a plurality of sand control through holes distributed in the circumferential direction of the outer casing, each sand control through hole is respectively provided with a sand control screen, and the fracturing channel includes a plurality of sand control through holes distributed in the outer casing. Circumferential fracturing channels of the body; The inner sliding sleeve of the fracturing ball seat and the fracturing ball seat, the inner sliding sleeve of the fracturing ball seat is sealed and connected to the inside of the outer casing, and is fixed with the outer casing through a first shearing connector, so that all the The inner sliding sleeve of the fracturing ball seat is located at a first position blocking the fracturing channel, and the fracturing ball seat is sealed and fixedly installed in the inner sliding sleeve of the fracturing ball seat; The inner sliding sleeve of the sand control ball seat and the sand control ball seat, the inner sliding sleeve of the sand control ball seat is sealed and connected to the inside of the outer casing, and is fixed with the outer casing through a second shearing connector, so that the sand control ball The inner sliding sleeve of the seat is located at a second position to block the sand control production channel, and the sand control ball seat is sealed and fixedly installed in the inner sliding sleeve of the sand control ball seat; When the first shear connecting piece is disconnected, the sliding sleeve in the fracturing ball seat slides to a third position away from the fracturing tunnel and in contact with the male joint, and then when the second shearing When the connecting piece is disconnected, the inner sliding sleeve of the sand control ball seat slides to a fourth position away from the sand control production channel, shielding the fracturing channel, and in contact with the inner sliding sleeve of the fracturing ball seat; Wherein, the first direction is a direction from the first end to the second end. 2. The sand control fracturing ball sliding sleeve according to claim 1 is characterized in that, The sand control screen includes: an installation ring, adapted and fixed to the sand control through hole; The main body of the sieve is fixed to the inner hole of the installation ring, and the main body of the sieve is at least one filter beads which are arranged in sequence in at least one section of the inner hole according to the shape of the section and fixed to each other. Layer screen structure, pores are formed between adjacent filter beads. 3. The sand control fracturing ball sliding sleeve according to claim 2 is characterized in that, The mounting ring is threadedly connected to the sand control through hole, and a plurality of mounting holes are uniformly distributed on the outer end surface of the mounting ring in the circumferential direction. 4. The sand control fracturing ball sliding sleeve according to claim 1, characterized in that, While the plurality of sand control channels are distributed in the circumferential direction of the outer casing, they are arranged in multiple rows in the axial direction of the outer casing, and the axial positions of any two adjacent rows are staggered. 5. The sand control fracturing ball sliding sleeve according to claim 1, characterized in that, A first ring groove is arranged on the outer wall of the inner sliding sleeve of the sand control ball seat and at one end close to the male joint, and an elastic limit ring is sleeved inside the ring groove, and the elastic limit ring is provided with a shaft in the circumferential direction. an opening to a penetration; A second annular groove is provided on the inner wall of the outer casing and close to the second end; Wherein, when the inner sliding sleeve of the fracturing ball seat is in the first position, the elastic limiting ring is in a compressed state, and when the inner sliding sleeve of the fracturing ball seat is in the third position, the The elastic limiting ring is located in the second ring groove and is expanded to fit in the second ring groove. 6. The sand control fracturing ball sliding sleeve according to claim 5, characterized in that, The end face of the second annular groove away from the male joint is a first conical surface, and its diameter gradually increases from the size equal to the inner diameter of the outer casing to the second annular groove along the first direction. diameters of equal size. 7. The sand control fracturing ball sliding sleeve according to claim 1, characterized in that, Two first anti-rotation lugs are symmetrically arranged on the end face of the inner sliding sleeve of the fracturing ball seat toward the second sliding sleeve, and the inner sliding sleeve of the sand control ball seat is symmetrically arranged toward the end face of the inner sliding sleeve of the fracturing ball seat There are two second anti-rotation lugs staggered with the circumferential positions of the two first anti-rotation lugs; Two third anti-rotation lugs are symmetrically arranged on the end face of the first sliding sleeve facing the male joint, and two third anti-rotation lugs are symmetrically arranged on the end face of the male joint facing the inner sliding sleeve of the fracturing ball seat. Two fourth anti-rotating lugs with staggered circumferential positions of the rotating lugs; When the inner sliding sleeve of the fracturing ball seat is in the third position, the two third anti-rotation lugs are respectively inserted between the gaps on both sides of the two fourth anti-rotation lugs; When the inner sliding sleeve of the sand control ball seat is in the fourth position, the two second anti-rotation lugs are respectively inserted between the two side gaps of the two first anti-rotation lugs. 8. The sand control fracturing ball sliding sleeve according to claim 1, characterized in that, The inner wall of the inner sliding sleeve of the fracturing ball seat and one end close to the female joint is provided with a first keyway, and the inner sliding sleeve of the sand control ball seat is provided with a second keyway at the end close to the female joint, so The first keyway and the second keyway are respectively used for matching the sliding sleeve switch tool. 9. The sand control fracturing ball sliding sleeve according to claim 8, characterized in that, One end of the inner hole of the inner sliding sleeve of the fracturing ball seat and the inner sliding sleeve of the sand control ball seat facing the first end is respectively provided with a second conical surface, and the diameter of the second conical surface is along the first The reversal of the direction is gradually increased by the same size as the sliding sleeve in the fracturing ball seat or the sliding sleeve in the sand control ball seat; The end faces of the first keyway and the second keyway close to the second end are a third tapered surface, and the diameter of the first keyway along the first direction is equal to the size of the inner diameter of the first keyway or the second keyway Gradually reduce to the size equal to the inner sliding sleeve of the fracturing ball seat or the inner sliding sleeve of the sand control ball seat. 10. The sand control fracturing ball sliding sleeve according to claim 1, characterized in that, The sand control ball seat and the fracturing ball seat are made of drillable cast iron or soluble metal materials.

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