CN115680574A - Layered filling sand prevention tool - Google Patents

Abstract

The invention discloses a sand control tool for layered filling. An upper joint, an upper central pipe, an inner central pipe, a lower central pipe and a lower joint are fixedly connected by threads in sequence; an upper spring, an upper valve seat and a sliding sleeve are installed on the outer periphery of the upper central pipe. , upper spool, sealing sheath; a sliding sleeve is installed in the upper central tube; the upper central tube and the sliding sleeve are fixed by shear nails; the outer circumference of the inner central tube is installed with an expansion rubber tube assembly; The installed sliding sleeve can cut the shear nails and move to the limit step inside the inner central tube; the lower central tube is equipped with a lower spring, a lower valve seat, and a lower valve core; the upper central tube has a radially upper filling port, and the lower central tube has a diameter The filling port is downward, and the inner central pipe has a liquid hole, and the expansion rubber cylinder assembly moves upward under the action of the pressure difference to compress the upper compression rubber cylinder, and then moves downward to compress the lower compression rubber cylinder. It can realize two-stage to multi-stage gravel filling, solve the problem of uneven filling in each layer due to differences between layers, and improve the sand control effect.

Description

A layered filling sand control tool

technical field

The invention belongs to the technical field of oil well stimulation measures, and in particular relates to a layered filling sand control tool.

Background technique

In the unconsolidated sandstone reservoirs of the Eastern Oilfield, most blocks face different degrees of sand production problems, which greatly affects the development of the oilfield. The sand production problem of multi-layer wells with long well intervals with interlayer spans greater than 50m is the current production problem. A common form of sand production. At present, the mechanical or chemical comprehensive sand control technology is mainly used for this kind of multi-layer wells at home and abroad. For foreign mechanical multi-stage and segmented sand control, the sand control effect is good, but there are High cost, complex pipe string, high construction risk, and difficult post-processing problems; chemical cage combined prevention, although the construction process is simple, but it is difficult to control the gravel filling of the main sand production layer, the integrity of the artificial well wall is poor, and there is a validity period short question. At present, the sand control countermeasures for multi-layer wells with long well sections mainly adopt the sand control technology of layer shedding, combined prevention or layer selection, but there are certain deficiencies in all of them. The sand control difficulties of multi-layer sand producing wells with long well sections are mainly reflected in:

(1) The well section is long, and the mechanical sand control pipe string is long. After the sand control fails, the pipe string is not easy to handle and requires overhaul;

(2) Large span, many layers, large differences in physical properties of each layer, and serious interlayer heterogeneity, resulting in the inability to uniformly fill sand in each layer when sand control measures are carried out, affecting the long-term and stable production of sand control wells.

Aiming at the problem that the late-stage pipe strings in multi-layer wells with long well sections are not easy to handle, research has been carried out, and the easy-to-handle sand control pipe strings for long well sections have been developed. Adaptability of mechanical sand control. However, the filling effect of multi-layer wells in long well sections has not been considered too much. Since multi-layer wells in long well sections have large interlayer spans, many layers, large differences in physical properties of each layer, and serious interlayer heterogeneity, sand control measures should be carried out. It affects the uniform sand filling of each layer, thus affecting the long-term and stable production of sand control wells.

Layered packing technology has been widely used in fracturing measures, but the fracturing layered filling section is relatively long, the construction pressure is relatively high, and the packer has problems such as high cost and high construction risk. It is necessary to study low-cost and low-risk layered tools suitable for sand control to solve the problem of poor filling effect in multi-layer wells with long well sections, which is of great significance for ensuring long-term and stable production of multi-layer wells with long well sections.

Contents of the invention

The technical problem to be solved by the present invention is to provide a sand control tool for layered filling, which has the functions of no slips, anti-pipe string creep, and anti-sand jamming. It can solve the problem of uneven layer filling and further improve the sand control effect of long well section sand control wells.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a layered filling sand control tool, including an upper joint, an upper center pipe, an upper spring, an upper valve seat, shear nails, a sliding sleeve, an upper valve core, and a sealing sheath , pin, inner central tube, upper compression rubber cylinder, expansion rubber cylinder assembly, lower compression rubber cylinder, lower central tube, lower spring, lower valve seat, lower filling port, lower valve core, lower joint;

The upper joint, the upper center pipe, the inner center pipe, the lower center pipe and the lower joint are fixedly connected by threads in sequence;

An upper spring, an upper valve seat, a sliding sleeve, an upper valve core and a sealing sheath are installed on the outer periphery of the upper central tube; a sliding sleeve is installed inside the upper central tube; the upper central tube and the sliding sleeve are fixed by shear nails;

The expansion rubber tube assembly is installed on the outer periphery of the inner central tube, and the expansion rubber tube assembly and the upper central tube are fixed by pins. The sliding sleeve installed in the tube can cut the shear pin and move to the limit step inside the inner central tube;

A lower spring, a lower valve seat and a lower valve core are installed on the outer periphery of the lower central tube;

The upper central tube has a radially upward filling port, the lower central tube has a radially downward filling port, and the inner central tube has a liquid passage hole. The expansion rubber tube assembly moves upwards under the action of the pressure difference and cuts off the pins to compress the upper compression rubber tube and expand the rubber tube. The assembly can move downward under the action of differential pressure to compress the rubber cartridge.

The pins are copper pins.

The beneficial effect of the present invention is: to realize the sand control of segmented gravel packing in the long well section, and develop a layered filling sand control tool with the functions of no slips, prevent pipe string creep and prevent sand sticking, which can realize two-stage to multi-stage gravel packing, Solve the problem of uneven filling of each layer due to the difference between layers, and further improve the sand control effect of the long section sand control well.

Description of drawings

Fig. 1 is the structural diagram of layered filling sand control tool of the present invention;

Fig. 2 is a schematic diagram of the local structure of the first section of the layered filling sand control tool of the present invention;

Fig. 3 is a schematic diagram of the partial structure of the second section of the layered filling sand control tool of the present invention;

Fig. 4 is a schematic diagram of the filling superstructure of the layered filling sand control tool of the present invention;

Fig. 5 is a schematic structural view of the expansion rubber cartridge assembly of the present invention;

In the figure, 1-upper joint, 2-upper central tube, 3-upper spring, 4-upper valve seat, 5-shear pin, 7-sliding sleeve, 8-upper valve core, 9-sealing sheath, 12-pin , 13-inner central tube, 14-upper compression rubber cylinder, 15-expansion rubber cylinder assembly, 16-lower compression rubber cylinder, 17-lower central tube, 18-lower spring, 19-lower valve seat, 20-lower filling port , 21-lower spool, 22-lower connector.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only part of the embodiments of the present invention, not all embodiments, based on The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom" etc. are based on the orientations shown in the drawings Or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "set with", "sleeved/connected", "connected", etc. should be understood in a broad sense, such as " Connection" 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 an indirect connection through an intermediary, and it can be an internal connection between two components. connectivity. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Figures 1-5, the layered filling sand control tool of the present invention includes an upper joint 1, an upper center pipe 2, an upper spring 3, an upper valve seat 4, shear nails 5, a sliding sleeve 7, an upper valve core 8, a sealing Sheath 9, pin 12, inner central tube 13, upper compression rubber cylinder 14, expansion rubber cylinder assembly 15, lower compression rubber cylinder 16, lower central tube 17, lower spring 18, lower valve seat 19, lower filling port 20, lower Spool 21, lower joint 22;

The upper joint 1, the upper central pipe 2, the inner central pipe 13, the lower central pipe 17, and the lower joint 22 are fixedly connected by threads in sequence;

Upper central tube 2 is equipped with upper spring 3, upper valve seat 4, sliding sleeve 7, upper valve core 8, sealing sheath 9; upper central tube 2 is equipped with sliding sleeve 7; upper central tube 2 and sliding sleeve 7 are formed The shear pin 5 is fixed;

An expansion rubber tube assembly 15 is installed on the outer periphery of the inner central tube 13, and the expansion rubber tube assembly 15 and the upper central tube 2 are fixed by pins 12. The upper compression rubber tube 14 and the lower compression rubber tube 16 are respectively installed on the upper and lower sides of the expansion rubber tube assembly 15; There is a limit step inside the tube 13, and the sliding sleeve 7 installed in the upper central tube 2 can cut the shear pin 5 and move to the limit step inside the inner central tube 13;

A lower spring 18, a lower valve seat 19, and a lower valve core 21 are installed on the outer periphery of the lower central tube 17;

The upper central tube 2 has a radially upper filling port 6, the lower central tube 17 has a radially lower filling port 20, the inner central tube 13 has a liquid hole 11, and the expansion rubber tube assembly 15 moves upward under the action of the pressure difference and then compresses the shear pin 12 The upper compression rubber cylinder 14 and the expansion rubber cylinder assembly 15 can move downward to compress the lower compression rubber cylinder 16 under the action of the pressure difference.

Preferably, the pin 12 is a copper pin.

The specific steps of using the layered filling sand control tool of the present invention are as follows:

(1) Downhole: The lower joint 22 of a layered filling sand control tool is connected with a plug to run into a predetermined well depth, and the layered filling sand control tool is located between the upper and lower layers.

(2) Fill the lower layer: use a pump truck on the ground to pressurize the sand-carrying liquid, and the sand-carrying liquid flows out from the lower filling port 20, and the lower spring 18 compresses the lower valve seat 19 and the lower valve core 21, and the inside and outside of the sand control tool are filled in layers to generate throttling pressure. Poor, under the action of throttling pressure difference, the expansion rubber tube assembly 15 expands radially and contacts with the casing wall to seal. Since the pressure of the lower layer is greater than the pressure of the upper layer, the piston effect of layered filling sand control tools further pushes the expansion rubber tube assembly 15 upward to move the shear pin 12 and then compress the upper compression rubber cylinder 14. The upper compression rubber cylinder 14 is in contact with the casing wall for sealing.

(3) Filling the upper layer: After filling the upper layer, push the ball to push the sliding sleeve 7 installed in the upper central tube 2 to cut the shear pin 5 and move to the limit step inside the inner central tube 13 . The sand-carrying liquid enters between the expansion rubber tube assembly 15 and the inner central tube 13 through the tolerance fit gap between the upper central tube 2 and the sliding sleeve 7, and the liquid passage hole 11, and the expansion and expansion rubber tube assembly 15 seals the casing, and the expansion rubber tube The pressure in the annular space at the upper part of the assembly 15 is greater than the pressure in the annular space at the lower part of the expansion rubber cylinder assembly 15, and the expansion rubber cylinder assembly 15 can move downwards and compress the lower compression rubber cylinder 16 under the action of the pressure difference.

The technical solution adopted in the present invention is: a layered filling sand control tool, including an upper joint 1, an upper central pipe 2, an upper spring 3, an upper valve seat 4, shear nails 5, a sliding sleeve 7, an upper valve core 8, a sealing Sheath 9, pin 12, inner central tube 13, upper compression rubber cylinder 14, expansion rubber cylinder assembly 15, lower compression rubber cylinder 16, lower central tube 17, lower spring 18, lower valve seat 19, lower filling port 20, lower The spool 21 and the lower joint 22 are composed;

The upper joint 1, the upper central pipe 2, the inner central pipe 13, the lower central pipe 17, and the lower joint 22 are fixedly connected by threads;

Upper central tube 2 is equipped with upper spring 3, upper valve seat 4, sliding sleeve 7, upper valve core 8, sealing sheath 9; upper central tube 2 is equipped with sliding sleeve 7; upper central tube 2 and sliding sleeve 7 are formed The shear pin 5 is fixed;

An expansion rubber tube assembly 15 is installed on the outer periphery of the inner central tube 13, and the expansion rubber tube assembly 15 and the upper central tube 2 are fixed by pins 12, and the upper compression rubber tube 14 and the lower compression rubber tube 16 are installed on the upper and lower sides of the expansion rubber tube assembly 15;

A lower spring 18, a lower valve seat 19, and a lower valve core 21 are installed on the outer periphery of the lower central tube 17;

The upper central tube 2 has a radially upper filling port 6, the lower central tube 17 has a radially lower filling port 20, the inner central tube 13 has a liquid hole 11, and the expansion rubber tube assembly 15 can be moved upward under the action of pressure difference and cut The pin 12 further compresses the upper compression rubber tube 14 , and the expansion rubber tube assembly 15 can move downwards and compress the lower compression rubber tube 16 under the action of the pressure difference.

The inside of the inner central tube 13 has a limiting step, and the sliding sleeve 7 installed in the upper central tube 2 can cut the shear pin 5 and move to the limiting step on the inner side of the inner central tube 13 .

When filling the lower layer, there is a throttling pressure difference inside and outside the sand control tool when filling the lower layer. Under the action of the throttling pressure difference, the expansion rubber sleeve assembly 15 radially expands to contact and seal with the casing wall. Since the lower layer pressure is greater than the upper layer pressure, the layered sand control tool The piston effect further pushes the expansion rubber cylinder assembly 15 upward to move the shear pin 12 to compress the upper compression rubber cylinder 14 . The upper compression rubber cylinder 14 is in contact with the casing wall for sealing.

After filling the upper layer, throwing a ball presses and pushes the sliding sleeve 7 installed in the upper center tube 2 to cut the shear nails 5 and move to the limit steps on the inside of the inner center tube 13 . The sand-carrying liquid enters between the expansion rubber tube assembly 15 and the inner central tube 13 through the tolerance fit gap between the upper central tube 2 and the sliding sleeve 7, and the liquid passage hole 11, and the expansion and expansion rubber tube assembly 15 seals the casing, and the expansion rubber tube The annular space pressure in the upper part of the assembly 15 is greater than the pressure in the lower annular space of the expansion rubber cartridge assembly 15, and the expansion rubber cartridge assembly 15 can move downwards and compress the lower compression rubber cartridge 16 under the action of the pressure difference, so that the lower layer is not disturbed when the upper layer is filled.

In summary, the content of the present invention is not limited to the above-mentioned embodiments, people of insight in the same field can easily propose other embodiments within the technical guidance of the present invention, but this embodiment All are included within the scope of the present invention.

Claims (2)

1. A layered filling sand control tool is characterized in that it comprises an upper joint (1), an upper center pipe (2), an upper spring (3), an upper valve seat (4), shear nails (5), a sliding sleeve ( 7), upper spool (8), sealing sheath (9), pin (12), inner central tube (13), upper compression rubber cylinder (14), expansion rubber cylinder assembly (15), lower compression rubber cylinder ( 16), lower central tube (17), lower spring (18), lower valve seat (19), lower filling port (20), lower valve core (21), lower joint (22); The upper joint (1), the upper center pipe (2), the inner center pipe (13), the lower center pipe (17), and the lower joint (22) are fixedly connected by threads in turn; Upper central tube (2) is equipped with upper spring (3), upper valve seat (4), sliding sleeve (7), upper valve core (8), sealing sheath (9); There is a sliding sleeve (7); the upper central tube (2) and the sliding sleeve (7) are fixed by shear nails (5); An expansion rubber tube assembly (15) is installed on the outer periphery of the inner center tube (13), the expansion rubber tube assembly (15) and the upper center tube (2) are fixed by pins (12), and the expansion rubber tube assembly (15) is respectively installed on the upper and lower The rubber cylinder (14), the lower compression rubber cylinder (16); the inner side of the inner central tube (13) has a limited step, and the sliding sleeve (7) installed in the upper central tube (2) can cut the shear nails (5) and move to the inner center The limiting step on the inside of the pipe (13); A lower spring (18), a lower valve seat (19), and a lower spool (21) are installed on the outer periphery of the lower center pipe (17); The upper central tube (2) has a radially upper filling port (6), the lower central tube (17) has a radially lower filling port (20), the inner central tube (13) has a liquid hole (11), and the expansion rubber cartridge assembly ( 15) Move the shearing pin (12) upwards under the action of differential pressure to compress the upper compression rubber tube (14), and the expansion rubber tube assembly (15) can move downward under the action of differential pressure to compress the lower compression rubber tube (16). 2. The layered filling sand control tool according to claim 1, characterized in that, the pins (12) are copper pins.

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