CN112081563B - Petroleum sand control screen pipe - Google Patents

Abstract

The present invention provides a petroleum sand control screen, and the technical field of sand control devices for oil and gas wells; it includes a screen body and a ceramic ring, a plurality of ceramic rings are sleeved on the screen body, and a support structure is provided between the screen body and the ceramic rings; the support structure includes a connecting ring and a support body connected to each other; one side of the support body abuts against the screen body, and the other side abuts against two adjacent ceramic rings, so that the screen body and the ceramic form a first flow gap; a barrier is provided on the side of the support body abutting against the ceramic ring, and the barrier is located between two adjacent ceramic rings, so that a second flow gap is formed between the two adjacent ceramic rings. The present invention forms a gap fit between the screen body and the ceramic ring and between two adjacent ceramic rings through the support structure, and there is no need to process ribs on the screen body and a protruding structure on the ceramic ring, which is convenient for production and processing, while avoiding the problem of excessive gap between two adjacent ceramic rings.

Description

Oil sand control screen

Technical Field

The invention relates to the technical field of oil and gas well sand control devices, in particular to a petroleum sand control screen pipe.

Background Art

In the process of oil and gas reservoir development, the sand control screen is the core component of sand control. The existing petroleum sand control screen mainly includes a screen body and a plurality of ceramic rings installed on the screen body. A gap for oil liquid circulation is formed between the ceramic rings and the screen body, and a gap for oil liquid circulation is also formed between two adjacent ceramic rings.

The gap between the existing ceramic ring and the screen tube body is formed by welding ribs on the screen tube body, which is difficult to process and affects the production efficiency. The gap between two adjacent ceramic rings is achieved by setting protrusions on both sides of the ceramic rings. However, during assembly, the two adjacent protrusions are prone to offset each other, thereby increasing the gap between the two ceramic rings and affecting the filtration accuracy.

Summary of the invention

The object of the present invention is to provide a petroleum sand control screen pipe to solve the problems of the existing sand control screen pipe having a difficult processing of the screen pipe body ribs and a large gap between two adjacent ceramic rings.

In order to solve the above technical problems, the present invention provides a petroleum sand control screen pipe, and the specific technical solution is as follows:

A petroleum sand control screen comprises a screen body and ceramic rings, wherein a plurality of the ceramic rings are sleeved on the screen body, and a plurality of support structures are arranged between the screen body and the ceramic rings; the support structure comprises a connecting ring and a supporting body connected to each other, wherein the width of the connecting ring is smaller than the width of the supporting body; one side of the supporting body abuts against the screen body, and the other side abuts against two adjacent ceramic rings, so that a first flow gap is formed between the screen body and the ceramic; a blocking portion is provided on one side of the supporting body abutting against the ceramic rings, and the blocking portion is located between two adjacent ceramic rings, so that a second flow gap is formed between the two adjacent ceramic rings.

Furthermore, there are multiple support bodies, and the multiple support bodies are arranged at intervals along the circumference of the connecting ring.

Furthermore, a third flow gap is provided between the connecting ring and the ceramic ring.

Furthermore, the support bodies of two adjacent support structures are spaced apart to form a fourth flow gap.

Furthermore, the support body includes a first support portion and a second support portion located on opposite sides of the connecting ring, and the barrier portion is located between the first support portion and the second support portion; one side of the first support portion and the second support portion are both abutted against the outer wall of the screen tube body, the other side of the first support portion is abutted against one of the two adjacent ceramic rings, and the other side of the second support portion is abutted against the other of the two adjacent ceramic rings.

Furthermore, the width of the ceramic ring gradually increases from the inside to the outside, so that two first inclined surfaces are formed on both sides of the ceramic ring; and second inclined surfaces matching the first inclined surfaces are provided on opposite sides of the blocking portion.

Furthermore, it also includes a sheath, which is arranged outside the ceramic ring and is gap-matched with the ceramic ring, and the sheath is provided with a plurality of through holes.

Furthermore, it also includes a fastening mechanism for limiting and fixing the sleeve and the ceramic ring, and the fastening mechanism includes a first fastening component and a second fastening component installed on the screen tube body; the first fastening component and the second fastening component are respectively located at two ends of the sleeve, the first fastening component is used to fix the sleeve and the ceramic ring on one side, and the second fastening component is used to fix the sleeve and the ceramic ring on the other side.

Furthermore, the first fastening assembly includes a first fixing ring, a first clamping ring and a disc spring; the first fixing ring is installed and fixed on the screen tube body; one end of the disc spring is connected to the ceramic ring, and the other end is connected to the first clamping ring; the first clamping ring is installed on the first fixing ring, and the first limiting wall and the second limiting wall are respectively provided on opposite sides of the first clamping ring; the first limiting wall is located between the disc spring and the fixing ring, the first limiting wall is connected to the disc spring, and is limitedly matched with the first fixing ring; the second limiting wall is located between the sleeve and the first fixing ring, and there is a preset interval between the second limiting wall and the sleeve, and when the first clamping ring moves to a preset position in the direction of the ceramic ring, the second limiting wall is limitedly matched with the end of the sleeve.

Furthermore, the second fastening assembly includes a second fixing ring and a second clamping ring; the second fixing ring is installed and fixed on the screen tube body; the second clamping ring is installed on the second fixing ring, and the second clamping ring is provided with a third limiting wall and a fourth limiting wall on opposite sides thereof; the third limiting wall is located between the ceramic ring and the second fixing ring, and is respectively limitedly matched with the ceramic ring and the second fixing ring; the fourth limiting wall is limitedly matched with the sleeve.

According to the petroleum sand control screen provided by the present invention, a clearance fit is formed between the screen body and the ceramic ring and between two adjacent ceramic rings through a supporting structure. There is no need to process ribs on the screen body, and there is no need to process a protruding structure on the ceramic ring. While facilitating production and processing, the problem of excessive gap between two adjacent ceramic rings is avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a petroleum sand control screen provided by an embodiment of the present invention;

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1;

FIG3 is a schematic diagram of the cooperation between the ceramic ring and the support structure provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of the structure of a support structure provided by an embodiment of the present invention.

icon:

1-Screen tube body;

2- Ceramic ring;

3-support structure; 31-connecting ring; 32-support body; 321-blocking part; 322-first supporting part; 323-second supporting part;

4-sheath; 41-through hole;

5-first fastening assembly; 51-first fixing ring; 52-first clamping ring; 521-first limiting wall; 522-second limiting wall; 53-disc spring;

6-second fastening assembly; 61-second fixing ring; 62-second clamping ring; 621-third limiting wall; 622-fourth limiting wall.

DETAILED DESCRIPTION

The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In order to achieve the filtering function and the oil circulation function, a gap needs to be formed between the ceramic ring 2 of the sand control screen and the screen body 1, and a gap also needs to be formed between two adjacent ceramic rings 2. Although machining ribs on the screen body 1 can achieve the clearance fit between the ceramic ring 2 and the screen body 1, it is difficult to weld the ribs on the screen body 1, which will affect the production efficiency; although protrusions are set on both sides of the ceramic ring 2 to achieve the clearance fit between the two adjacent ceramic rings 2, it is easy for the protrusions of the two adjacent ceramic rings 2 to offset each other during installation, increasing the gap between the two adjacent ceramic rings 2 and affecting the filtering accuracy. Therefore, this embodiment provides a petroleum sand control screen.

Specifically, as shown in Figures 1 and 2, similar to the existing sand control screen, a petroleum sand control screen of the present embodiment also includes a screen body 1 and a ceramic ring 2. Preferably, the ceramic ring 2 of the present embodiment adopts alumina ceramics with high conductivity, mechanical strength and high temperature resistance. A plurality of ceramic rings 2 are sleeved on the screen body 1 along the axial direction of the screen body 1. In addition, the petroleum sand control screen of the present embodiment also includes a plurality of support structures 3 arranged between the screen body 1 and the ceramic ring 2. The support structure 3 supports and fixes the ceramic ring 2 to achieve a clearance fit between the ceramic ring 2 and the screen body 1, and the support structure 3 can also limit and block two adjacent ceramic rings 2 to achieve a clearance fit between the two adjacent ceramic rings 2. This structure does not require processing ribs on the screen body 1, nor does it require processing a protruding structure on the ceramic ring 2. While facilitating production and processing, it also avoids the problem of excessive gap between two adjacent ceramic rings 2.

As shown in Figures 3 and 4, the support structure 3 of this embodiment includes a connecting ring 31 and a supporting body 32 connected to each other. It can be understood that the supporting body 32 is connected to the connecting ring 31, or that the connecting ring 31 is connected to both sides of the supporting body 32. The width of the connecting ring 31 of this embodiment is much smaller than the width of the supporting body 32, or the width of the supporting body 32 is larger, so as to support the ceramic ring 2. After assembly, one side of the supporting body 32 of this embodiment abuts against the sieve tube body 1, and the other side abuts against two adjacent ceramic rings 2, so that the sieve tube body 1 and the ceramic form a first flow gap. And a barrier portion 321 is provided on the side of the supporting body 32 abutting against the ceramic ring 2. The barrier portion 321 can be a convex structure. The barrier portion 321 is located between two adjacent ceramic rings 2, and the opposite sides of the barrier portion 321 abut against the side portions of the two adjacent ceramic rings 2 respectively. The barrier portion 321 can form a second flow gap between the two adjacent ceramic rings 2, and the filtering accuracy of the ceramic ring 2 can be adjusted by adjusting the size of the barrier portion 321.

In addition, the inventors have found that the number of protrusions processed on the existing ceramic ring 2 is generally one or two. During assembly, since the ceramic ring 2 has only one or two fulcrums in the axial direction of the screen tube body 1, it is easy to have a problem of tilting. The gap between the tilted ceramic ring 2 and its adjacent ceramic ring 2 is larger on one side and smaller on the other side, which affects the filtering effect. Therefore, this embodiment makes further improvements to the support structure 3, and designs the number of support bodies 32 to be multiple. The multiple support bodies 32 are arranged at intervals along the circumference of the connecting ring 31, which can play a good supporting and fixing role for the ceramic ring 2 and prevent the tilting phenomenon.

In order to prevent the support structure 3 from affecting the flow of oil, the connecting ring 31 in this embodiment is processed into a flat ring structure. Compared with the support body 32, the width and thickness of the connecting ring 31 in this embodiment are smaller, so that there is a third flow gap or flow interval between the connecting ring 31 and the ceramic ring 2.

Similarly, this embodiment also optimizes the structural shape and size of the support body 32. The support body 32 of this embodiment is a rectangular block structure, and the support bodies 32 of two adjacent support structures 3 are spaced apart so that there are two planes between the two adjacent support bodies 32 to form a fourth flow gap for facilitating the passage of fluid.

Specifically, the rectangular block-shaped support body 32 includes a first support portion 322 and a second support portion 323 located on opposite sides of the connecting ring 31. The barrier portion 321 of this embodiment is located between the first support portion 322 and the second support portion 323; one side of the first support portion 322 abuts against the outer wall of the sieve tube body 1, and the other side of the first support portion 322 abuts against one of the two adjacent ceramic rings 2; one side of the second support portion 323 also abuts against the outer wall of the sieve tube body 1, and the other side of the second support portion 323 abuts against the other of the two adjacent ceramic rings 2. The support of the two ceramic rings 2 is achieved through a support structure 3, and the structure is more compact. Preferably, the side where the first support portion 322 of this embodiment abuts against the sieve tube body 1 and the side where the second support portion 323 abuts against the sieve tube body 1 can be optimized and designed as arc surfaces to improve the fit with the sieve tube body 1.

In addition, in order to facilitate the assembly and self-cleaning of the screen tube, the width of the ceramic ring 2 of this embodiment gradually increases in the direction from the inside to the outside, so that the cross section of the ceramic ring 2 can be approximated to an isosceles trapezoid, so that two first inclined surfaces are formed on both sides of the ceramic ring 2; accordingly, the opposite sides of the barrier portion of this embodiment are provided with second inclined surfaces adapted to the first inclined surfaces. The first inclined surface and the second inclined surface can not only cooperate with the second inclined surface of the barrier portion during assembly to achieve a certain guiding effect to improve the assembly positioning efficiency, but also in other areas except the barrier portion, a second flow gap similar to a triangle can be formed between two adjacent ceramic rings 2, and the expansion rate of the second flow gap between two adjacent ceramic rings 2 gradually increases. This structure is not conducive to the accumulation of impurities such as fine sand inside the gap. When the oil passes through the second flow gap, it can take away impurities such as fine sand, which is conducive to faster penetration of the oil to obtain a better filtering effect.

Based on the above structure, the inventors found that when the above petroleum ceramic screen is transported or lowered into the oil well, it is easy to be bumped, so that the ceramic ring 2 is broken, which directly affects the filtering accuracy. If the damaged sand filter pipe is continued to be lowered into the well without knowing it, it will cause serious sand leakage and sand carrying accidents, which will directly affect the oil production quality; therefore, combined with Figure 2, the petroleum ceramic screen of this embodiment is also provided with a sheath 4, the sheath 4 is preferably made of metal or alloy material, the sheath 4 is covered outside the ceramic ring 2, and is in gap with the ceramic ring 2. The sheath 4 is provided with a plurality of through holes 41 for unfiltered oil to flow into the screen body 1. Based on the structure of the sheath 4, the oil ceramic screen of this embodiment also includes a fastening mechanism for limiting and fixing the sheath 4 and the ceramic ring 2, and the sheath 4 and the ceramic ring 2 are limited and fixed by the fastening mechanism, so as to achieve multi-purpose integration and simplify the structure.

Specifically, the fastening mechanism of this embodiment includes a first fastening assembly 5 and a second fastening assembly 6 installed on the screen body 1; the first fastening assembly 5 and the second fastening assembly 6 are respectively located at both ends of the jacket 4, the first fastening assembly 5 is used to fix the jacket 4 and the ceramic ring 2 on one side, and the second fastening assembly 6 is used to fix the jacket 4 and the ceramic ring 2 on the other side.

Based on the above-mentioned fastening mechanism, the inventors found that when the oil sand control screen is bent and deformed underground, since the position of the fastening mechanism cannot be adjusted, the fastening mechanism will be unable to fix the limiting ceramic ring 2 due to the deformation of the screen body 1, resulting in the two sides of the ceramic body composed of the ceramic rings 2 being unconstrained, thereby causing the gap between the two adjacent ceramic rings 2 to change. Therefore, this embodiment proposes an adjustable fastening mechanism.

Specifically, the first fastening assembly 5 of the present embodiment includes a first fixing ring 51, a first clamping ring 52 and a disc spring 53; the first fixing ring 51 is installed and fixed on the screen tube body 1, and the fixing method can be welding or the like; one end of the disc spring 53 is connected to the ceramic ring 2, and the other end is connected to the first clamping ring 52; the first clamping ring 52 is installed on the first fixing ring 51, and the first limiting wall 521 and the second limiting wall 522 are respectively provided on the opposite sides of the first clamping ring 52; the first limiting wall 521 is located between the disc spring 53 and the first fixing ring 51, the first limiting wall 521 is connected to the disc spring 53, and is limitedly matched with the first fixing ring 51; the second limiting wall 522 is located between the sleeve 4 and the first fixing ring 51, and there is a preset interval between the second limiting wall 522 and the sleeve 4. When the clamping ring moves to a preset position in the direction of the ceramic ring 2, the second limiting wall 522 is limitedly matched with the end of the sleeve 4. When the screen tube body 1 bends, the structure can compensate and tighten the ceramic ring 2 through the elasticity of the disc spring 53 to prevent the gap between two adjacent ceramic rings 2 from changing.

The second fastening assembly 6 of this embodiment may have the same structure as the first fastening assembly 5, or may be as shown in FIG. 2 without the disc spring 53 structure, and elastic compensation cannot be achieved, that is, when the second fastening assembly 6 of this structure is adopted, elastic compensation is achieved only through the first fastening assembly 5. Specifically, the second fastening assembly 6 of this embodiment includes a second fixing ring 61 and a second clamping ring 62; the second fixing ring 61 of this embodiment is installed and fixed on the screen tube body 1; the second clamping ring 62 is installed on the second fixing ring 61, and the second clamping ring 62 is provided with a third limiting wall 621 and a fourth limiting wall 622 on opposite sides thereof; the third limiting wall 621 is located between the ceramic ring 2 and the fixing ring, and is respectively limited with the ceramic ring 2 and the second fixing ring 61; the fourth limiting wall 622 is limited with the sleeve 4.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. The petroleum sand control screen comprises a screen body and ceramic rings, wherein a plurality of ceramic rings are sleeved on the screen body, and the petroleum sand control screen is characterized by further comprising a plurality of support structures arranged between the screen body and the ceramic rings;

the support structure comprises a connecting ring and a support body which are connected, and the width of the connecting ring is smaller than that of the support body;

One side of the support body is propped against the screen pipe body, and the other side of the support body is propped against two adjacent ceramic rings, so that a first overflow gap is formed between the screen pipe body and the ceramic rings;

A blocking part is arranged on one side of the support body, which is propped against the ceramic rings, and the blocking part is positioned between two adjacent ceramic rings so as to form a second overflow gap between the two adjacent ceramic rings;

The supporting body comprises a first supporting part and a second supporting part which are positioned on two opposite sides of the connecting ring, and the blocking part is positioned between the first supporting part and the second supporting part; one side of each of the first supporting part and the second supporting part is abutted against the outer wall of the screen pipe body, the other side of each of the first supporting parts is abutted against one of the two adjacent ceramic rings, and the other side of each of the second supporting parts is abutted against the other of the two adjacent ceramic rings;

The width of the ceramic ring is gradually increased along the direction from inside to outside, so that two first inclined surfaces are formed on two sides of the ceramic ring; the opposite sides of the blocking part are provided with second inclined planes which are matched with the first inclined planes.

2. The oil sand control screen of claim 1, wherein the number of support bodies is a plurality, the plurality of support bodies being circumferentially spaced along the connection ring.

3. The oil sand control screen of claim 1, wherein a third flow gap is provided between the connection ring and the ceramic ring.

4. The oil sand control screen of claim 1, wherein the support bodies of adjacent two of the support structures are spaced apart to form a fourth flow gap.

5. The oil sand control screen as recited in any one of claims 1-4 further comprising a jacket, the jacket being disposed over the ceramic ring and in clearance fit with the ceramic ring, the jacket being provided with a plurality of through holes.

6. The oil sand control screen of claim 5, further comprising a fastening mechanism for positively securing the jacket and the ceramic rings, the fastening mechanism comprising a first fastening assembly and a second fastening assembly mounted on the screen body;

The first fastening component and the second fastening component are respectively positioned at two ends of the sheath, the first fastening component is used for fixing the sheath and the ceramic ring positioned at one side, and the second fastening component is used for fixing the sheath and the ceramic ring positioned at the other side.

7. The oil sand control screen of claim 6, wherein the first fastening assembly comprises a first securing ring, a first clamp ring, and a disc spring;

the first fixing ring is fixedly arranged on the screen pipe body;

one end of the disc spring is connected with the ceramic ring, and the other end of the disc spring is connected with the first compression ring;

The first compression ring is arranged on the first fixed ring, and a first limiting wall and a second limiting wall are respectively arranged on two opposite sides of the first compression ring; the first limiting wall is positioned between the disc spring and the first fixed ring, connected with the disc spring and in limiting fit with the first fixed ring; the second limiting wall is located between the sheath and the first fixing ring, a preset interval is reserved between the second limiting wall and the sheath, and when the first compression ring moves to a preset position in the direction of the ceramic ring, the second limiting wall is in limiting fit with the end part of the sheath.

8. The oil sand control screen of claim 6, wherein the second fastening assembly comprises a second securing ring and a second clamp ring;

The second fixing ring is fixedly arranged on the screen pipe body;

The second compression ring is arranged on the second fixed ring, and a third limiting wall and a fourth limiting wall are respectively arranged on two opposite sides of the second compression ring; the third limiting wall is positioned between the ceramic ring and the second fixing ring and is in limiting fit with the ceramic ring and the second fixing ring respectively; the fourth limiting wall is in limiting fit with the sheath.