CN210134892U - Sand-proof screen pipe - Google Patents

Abstract

The utility model provides a sand control screen pipe, include: the wall of the sleeve is provided with a slot for the circulation of produced gas and formation sand, and the side wall of the ceramic ring is provided with a sand prevention gap; the ceramic ring is fixedly arranged in the sleeve, and an annular cavity is arranged between the outer wall of the ceramic ring and the inner wall of the sleeve. Through the utility model discloses, it is relatively poor to have alleviated the erosion resistance that the sand control screen pipe among the prior art existed, erodees the technical problem who damages easily in high-pressure high yield gas well.

Description

Sand-proof screen pipe

Technical Field

The utility model relates to an oil gas well exploitation field, in particular to sand control screen pipe.

Background

In the production process of a gas well, the produced gas has obvious erosion effect on a gas production pipe column; particularly, in a sand production well, produced gas carries formation sand to erode a gas production pipe column seriously. In the production process of a sand production well, the screen pipe sand control technology is a widely applied sand control means. At present, the sand control screen pipe applied to a gas well lacks effective measures aiming at gas erosion, and has the technical problems of poor erosion resistance and easy erosion damage in a high-pressure high-yield gas well.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sand control screen pipe for the anti erosion performance that the sand control screen pipe among the solution prior art exists is relatively poor, erodees the technical problem who damages easily in high-pressure high yield gas well.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a sand control screen pipe, include: the wall of the sleeve is provided with a slot for the circulation of produced gas and formation sand, and the side wall of the ceramic ring is provided with a sand prevention gap; the ceramic ring is fixedly arranged in the sleeve, and an annular cavity is arranged between the outer wall of the ceramic ring and the inner wall of the sleeve.

In a preferred embodiment, the slot extends in an axial direction of the sleeve, and the wall of the sleeve is provided with a plurality of slots circumferentially spaced around the axis of the sleeve.

In a preferred embodiment, the wall of the casing is provided with a plurality of slots spaced axially along the casing.

In a preferred embodiment, the sand control gaps extend in an axial direction of the ceramic ring, and the side wall of the ceramic ring is provided with a plurality of sand control gaps circumferentially spaced around an axis of the ceramic ring.

In a preferred embodiment, each of the slots is offset from each of the sand control slots.

In a preferred embodiment, the ceramic ring is a plurality of ceramic rings, and the ceramic rings are adjacently distributed along the axial direction of the sleeve.

In a preferred embodiment, one of two adjacent ceramic rings is provided with a protrusion, and the other ceramic ring is provided with a groove matched with the protrusion.

In a preferred embodiment, the protrusions are V-shaped protrusions and the grooves are V-shaped grooves.

In a preferred embodiment, the sand screen includes a plurality of support ribs disposed in the annular cavity, the plurality of support ribs being circumferentially spaced about the axis of the casing.

In a preferred embodiment, the sand control screen comprises an upper pressing cap and a lower retaining ring, the upper pressing cap and the lower retaining ring are respectively connected to two ends of the casing, and the ceramic rings are located between the upper pressing cap and the lower retaining ring and respectively abut against the upper pressing cap and the lower retaining ring.

In a preferred embodiment, an axial hole is formed in the lower retaining ring, a protruding portion is formed at a first end of the support rib, the support rib is arranged in the axial hole in a penetrating manner, and the protruding portion abuts against an end face, far away from the upper pressure cap, of the lower retaining ring.

In a preferred embodiment, the inner wall of the sleeve is provided with a step portion, the second end of the support rib is provided with a bending portion abutting against the step portion, and the acting force applied by the step portion to the bending portion points to a direction away from the lower retaining ring.

In a preferred embodiment, the sand control screen comprises a universal joint, the universal joint comprises an upper joint and a lower joint which are communicated, and the upper joint can rotate universally relative to the lower joint; the upper joint is connected with one end of the sleeve, and/or the lower joint is connected with one end of the sleeve.

In a preferred embodiment, the universal joint comprises a ball joint, the lower joint is connected to one end of the ball joint, and the other end of the ball joint is spherically fitted with the upper joint.

In a preferred embodiment, the upper joint is provided with a first inner spherical surface, and the ball joint is provided with an outer spherical surface that is fitted with the first inner spherical surface.

In a preferred embodiment, the universal joint comprises an external pressing cap connected to the upper joint for pressing the ball joint against the upper joint.

In a preferred embodiment, the outer pressure cap is provided with a second inner spherical surface cooperating with the outer spherical surface.

The utility model discloses a characteristics and advantage are: during production, stratum produced gas carries stratum sand and enters the annular cavity through the slot; the produced gas continuously passes through the sand prevention gap and enters the ceramic ring. The sand prevention gap can play a role in blocking formation sand, so that the formation sand is blocked in the annular cavity, a stable sand bridge is formed along with the gradual accumulation of the formation sand in the annular cavity, and the sand bridge blocks the formation sand outside the sleeve from further entering. The ceramic ring in the utility model is made of ceramic material, and has good erosion resistance; and, in the production process, the output gas need pass the sand bridge that is formed in the toroidal cavity, then reentrant ceramic ring, and the sand bridge can play the cushioning effect to the erosion effect of output gas, in order to further strengthen the utility model provides a sand control screen pipe's erosion resistance ability, increase of service life.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a first embodiment of a sand screen according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of a first perspective view of a ceramic ring of the sand control screen of FIG. 1;

FIG. 3 is a schematic illustration of a second perspective view of a ceramic ring of the sand control screen of FIG. 1;

FIG. 4 is a schematic illustration of a first perspective view of a lower retainer ring in the sand screen of FIG. 1;

FIG. 5 is a schematic illustration of a second perspective view of a lower retainer ring of the sand screen of FIG. 1;

FIG. 6 is an enlarged view of a portion of FIG. 1 at A;

fig. 7 is a partial enlarged view at B in fig. 1;

FIG. 8 is a schematic structural view illustrating a first state of a universal joint in a sand control screen according to an embodiment of the present invention;

fig. 9 is a schematic structural view showing a second state of the universal joint in the sand control screen according to the embodiment of the present invention.

The reference numbers illustrate: 10. a sleeve; 11. slotting; 12. an annular cavity; 13. a step portion; 20. a ceramic ring; 21. sand control gaps; 22. a protrusion; 23. a groove; 30. supporting ribs; 301. a first end of a support bar; 302. a second end of the support bar; 31. a boss portion; 32. a bending section; 40. a lower baffle ring; 41. an axial bore; 50. pressing the cap upwards; 60. an upper joint; 61. a first inner spherical surface; 70. a lower joint; 80. a ball joint; 81. an outer spherical surface; 90. externally pressing the cap; 91. a second inner spherical surface; 100. universal connector.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a sand control screen, including: the sand-proof sleeve comprises a sleeve 10 and a ceramic ring 20, wherein a slot 11 for communicating produced gas and formation sand is formed in the wall of the sleeve 10, and a sand-proof gap 21 is formed in the side wall of the ceramic ring 20; the ceramic ring 20 is fixedly arranged in the casing 10, and the outer diameter of the ceramic ring 20 is smaller than the inner diameter of the casing 10, so that an annular cavity 12 is formed between the outer wall of the ceramic ring 20 and the inner wall of the casing 10.

During production, stratum produced gas carries stratum sand and enters the annular cavity 12 through the slots 11; the produced gas continues to pass through the sand control slots 21, enters the ceramic rings 20, and circulates through the ceramic rings 20 for gas production.

The sand control gaps 21 can block formation sand, so that the formation sand is trapped in the annular cavity 12 and gradually accumulated in the annular cavity 12 to form a stable sand bridge, and the formation sand outside the casing 10 is blocked from further entering. The ceramic ring 20 in the embodiment of the present invention is made of ceramic material, and has good erosion resistance; and, in the production process, the output gas need pass the sand bridge that is formed in toroidal cavity 12, then reentrant ceramic ring 20, and the sand bridge can play the cushioning effect to the erosion effect of output gas, in order to further strengthen the utility model discloses the erosion resistance performance of the sand control screen pipe that the embodiment provides, increase of service life.

The shape of the slot 11 may be various, for example, it may be a circular hole or a polygonal hole. Referring to fig. 1, in the present embodiment, in order to facilitate passage of the produced gas and reduce formation sand carried by the produced gas, the inventor sets the slots 11 to be strip-shaped, a cross section of the strip-shaped slots 11 along a tangent plane direction of the casing 10 is rectangular, and the length of the strip-shaped slots 11 is greater than the width of the strip-shaped slots, and the length direction of the strip-shaped slots 11 is along an axial direction of the casing 10. The wall of the casing 10 is provided with a plurality of slots 11 spaced circumferentially around the axis of the casing 10 (the circumferential direction being in a plane perpendicular to the axis of the casing 10 and extending around the axis of the casing 10) to improve the efficiency of the flow of the produced gas into the casing 10. Further, the length of the slit 11 is smaller than that of the casing 10, and the wall of the casing 10 is provided with a plurality of slits 11 spaced apart in the axial direction of the casing 10.

The shape of the sand control slits 21 may be various, and may be, for example, a circular hole or a polygonal hole. In this embodiment, the inventors set the sand control slits 21 to be long, the cross section of the long sand control slits 21 along the tangent plane direction of the ceramic ring 20 is rectangular, the length is greater than the width, and the length direction is set along the axial direction of the ceramic ring 20. Long banding sand control gap 21 utilizes the less size of width direction to realize the effect of blockking to the stratum sand, simultaneously through setting up to great size at length direction, makes single sand control gap 21 have great cross sectional area, is convenient for produce the gas and passes through.

The formation sand enters the annular cavity 12 along with the produced gas and has the tendency of continuously moving towards the outer wall of the ceramic ring 20, and in order to reduce the impact of the formation sand on the outline of the sand-prevention gaps 21, the slots 11 and the sand-prevention gaps 21 are staggered, so that the formation sand is prevented from directly impacting the sand-prevention gaps 21 after passing through the slots 11.

The embodiment for achieving the offset of each slot 11 from each sand control gap 21 is not limited to one. For example: along the circumferential direction of the casing 10, each slit 11 is staggered with each sand control gap 21; alternatively, the slots 11 are offset from the sand control slots 21 in the axial direction of the casing 10.

In some embodiments, the ceramic ring 20 in the bushing 10 extends from one end of the bushing 10 to the other. In the present embodiment, a plurality of ceramic rings 20 are disposed in one casing 10, the plurality of ceramic rings 20 are adjacently distributed along the axial direction of the casing 10, so as to reduce the length of a single ceramic ring 20, which is convenient for processing, and because the ceramic rings 20 have a relatively high rigidity, they are not easy to deform, and two adjacent ceramic rings 20 can be relatively displaced, so as to realize adjustment of the overall shape, which is convenient for fine adjustment along with the shape of the wellbore during the process of running into the wellbore.

Referring to fig. 1, one ceramic ring 20 of two adjacent ceramic rings 20 is provided with a protrusion 22, the other ceramic ring 20 is provided with a groove 23 matching with the protrusion 22, and the protrusion 22 is clamped in the groove 23, so that on one hand, the contact area between the two adjacent ceramic rings 20 is increased, the connection reliability is improved, on the other hand, the two ceramic rings 20 can be limited from rotating relatively around the axis, and the relative position of the sand-prevention gap on each ceramic ring 20 is kept stable. In the gas production process, the produced gas can impact the ceramic ring 20, and the protrusion 22 and the groove 23 limit the position of the ceramic ring 20, so that the stability of the position of the ceramic ring 20 can be improved, and the vibration can be avoided.

The shape of the projections 22 and the recesses 23 can be variously embodied, for example: the protrusion 22 and the groove 23 may be both elongated or both semicircular. Referring to fig. 2 and 3, in the embodiment, the inventor sets the protrusion 22 as a V-shaped protrusion, and sets the groove 23 as a V-shaped groove matching with the V-shaped protrusion, and during the assembling process, the inclined surface on the V-shaped protrusion can play a guiding role so as to facilitate the V-shaped protrusion to be installed in the V-shaped groove.

The utility model discloses an in the embodiment, be equipped with a plurality of brace rods 30 between ceramic ring 20 and the sleeve pipe 10, also be equipped with a plurality of brace rods 30 in toroidal cavity 12, a plurality of brace rods 30 are around the axis circumference interval distribution of sleeve pipe 10, the inner wall of brace rod 30 and the outer wall contact of ceramic ring 20, the outer wall of brace rod 30 and the inner wall contact of sleeve pipe 10, a plurality of cavities are separated into with toroidal cavity 12 to brace rod 30, the radial thickness of each cavity equals the thickness of brace rod 30. The support ribs 30 limit the position of the ceramic ring 20 in the sleeve 10, so as to prevent the ceramic ring 20 from radially shaking in the sleeve 10, which is beneficial to keeping the radial thickness of each position of the annular cavity 12 uniform and consistent.

Referring to fig. 1, the sand control screen includes an upper press cap 50 and a lower retainer ring 40, wherein the upper press cap 50 and the lower retainer ring 40 are respectively connected to two ends of the casing 10 and respectively abut against the ceramic rings 20 to block two ends of the annular cavity 12. The upper gland 50 is threaded into the bushing 10 and the lower retainer ring 40 is threaded into the bushing 10 to clamp the ceramic ring 20 in the bushing 10.

Referring to fig. 1, 4-6, an axial hole 41 is formed in the lower retaining ring 40, a protruding portion 31 is formed at a first end 301 of the support rib, the support rib 30 is inserted into the axial hole 41, and the protruding portion 31 abuts against an end surface of the lower retaining ring 40 away from the upper pressure cap 50; referring to fig. 1, at the joint of the upper pressing cap 50 and the sleeve 10, the inner diameter of the left end of the sleeve 10 is larger than that of the right end, forming a step 13. Referring to fig. 1 and 7, the second end 302 of the support rib is provided with a bending portion 32, the bending portion 32 abuts against the step portion 13, and the acting force applied by the step portion 13 to the bending portion 32 points to a direction away from the lower retaining ring 40, so that the support rib 30 is kept tight in the sleeve 10, and the position of the support rib 30 is firmer.

The lower baffle ring 40 is provided with a plurality of axial holes 41 distributed at intervals along the circumference, and the plurality of support ribs 30 correspond to the plurality of axial holes 41 one by one, so that the circumferential distribution mode of the support ribs 30 is controlled.

In some embodiments, the support bar 30 is made of steel, and one end of the support bar 30 has a protrusion 31 and the other end is kept straight. During assembly, the support rib 30 is firstly inserted into the axial hole 41; then, the upper pressing cap 50 is rotated, so that the upper pressing cap 50 moves in the direction pointing to the lower retaining ring 40 under the action of the screw threads, the upper pressing cap 50 pushes the support rib 30 to bend to form a bent part 32, and the bent part 32 is abutted to the step part 13; and then the lower retaining ring 40 is rotated to enable the lower retaining ring 40 to move in the direction away from the upper pressing cap 50 under the action of the screw threads, so that the support rib 30 is tensioned, and the support rib 30 is kept tight.

The wellbore typically presents a curved section. In the process of putting the gas production pipe column into the well hole, if the gas production pipe column meets the bent part of the well hole, the gas production pipe column is easy to be damaged by collision. In order to alleviate the above technical problems, the sand control screen provided in this embodiment includes a universal joint 100, please refer to fig. 8 and 9, the universal joint 100 includes an upper joint 60 and a lower joint 70, both the upper joint 60 and the lower joint 70 are provided with a channel, and the channel of the upper joint 60 is communicated with the channel of the lower joint 70; the upper joint 60 is universally rotatable with respect to the lower joint 70; the upper joint 60 is threadedly coupled to one end of the casing 10, and/or the lower joint 70 is threadedly coupled to one end of the casing 10, and the upper joint 60, the lower joint 70 and the casing 10 form a communicating passage for the flow of the generated gas. The casing 10 is connected to the gas production string through the universal connector 100, so that the casing 10 can freely and universally rotate, and in the running process, if the casing 10 meets the bent part of the well hole, the casing 10 can deflect along with the shape of the well hole, so that collision is reduced, and the casing is not damaged.

Specifically, the sand control screen according to the present embodiment includes a plurality of casings 10, and a ceramic ring 20 is fixed in each casing 10. Two adjacent sleeves 10 are connected through a universal connector 100, and a plurality of sleeves 10 and the universal connector 100 form a communicated channel. Under the action of the universal connector 100, the plurality of casings 10 can rotate in a universal manner relatively, so that the flexibility of deflection along with the shape of the borehole is improved.

The universal connector 100 comprises a spherical joint 80, the lower joint 70 is in threaded connection with one end of the spherical joint 80, and the other end of the spherical joint 80 is in spherical fit with the upper joint 60; the ball joint 80 is provided with a passage, and both ends of the passage communicate with the upper joint 60 and the lower joint 70, respectively. The spherical joint 80 and the upper joint 60 can rotate relatively around the spherical center of the spherical surface fit, and the spherical surface on the spherical joint 80 and the spherical surface on the upper joint 60 are kept attached in the rotating process, so that the spherical joint has a large fit surface, and the smoothness and the stationarity of the relative rotation are guaranteed.

There are a variety of ways to achieve a spherical fit of the ball joint 80 with the upper joint 60. For example, in some embodiments, the upper joint 60 is provided with an outer spherical surface, and the ball joint 80 is provided with an inner spherical surface matched with the outer spherical surface, the outer spherical surface is embedded in the inner spherical surface, and the spherical center of the outer spherical surface and the spherical center of the inner spherical surface are located at the same point, so that the upper joint 60 rotates around the point relative to the ball joint 80.

In the present embodiment, the upper joint 60 is provided with the first inner spherical surface 61, the ball joint 80 is provided with the outer spherical surface 81 that is fitted with the first inner spherical surface 61, the outer spherical surface 81 is embedded in the first inner spherical surface 61, and the spherical center of the outer spherical surface 81 and the spherical center of the first inner spherical surface 61 are located at the same point to realize the rotation of the upper joint 60 relative to the ball joint 80 about the point.

The universal joint 100 includes an outer pressing cap 90 connected to the upper joint 60, and the outer pressing cap 90 is used to press the ball joint 80 against the upper joint 60. One end of the outer pressing cap 90 is provided with a screw thread through which it is connected to the upper joint 60; the other end of outer pressure cap 90 is provided with sphere 91 in the second, and sphere 91 and the cooperation of spherical surface 81 in the second for when spherical joint 80 rotated for top connection 60, sphere 91 and the laminating of spherical surface are kept in the second, are convenient for compress tightly spherical joint 80, avoid spherical joint 80 to break away from top connection 60.

The above description is only for the embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims (17)

1. A sand control screen, comprising: the wall of the sleeve is provided with a slot for the circulation of produced gas and formation sand, and the side wall of the ceramic ring is provided with a sand prevention gap;

the ceramic ring is fixedly arranged in the sleeve, and an annular cavity is arranged between the outer wall of the ceramic ring and the inner wall of the sleeve.

2. The sand control screen of claim 1, wherein the slots extend axially of the casing, and the wall of the casing is provided with a plurality of slots circumferentially spaced about the axis of the casing.

3. The sand control screen of claim 2, wherein the wall of the casing is provided with a plurality of slots spaced axially along the casing.

4. The sand control screen of claim 2, wherein the sand control slots extend axially of the ceramic rings, and wherein the sidewalls of the ceramic rings are provided with a plurality of sand control slots circumferentially spaced about the axis of the ceramic rings.

5. The sand control screen of claim 4, wherein each of the slots is offset from each of the sand control slots.

6. The sand control screen of any one of claims 1-5, wherein the ceramic rings are a plurality of ceramic rings, the plurality of ceramic rings being adjacently disposed along an axial direction of the casing.

7. The sand control screen of claim 6, wherein two adjacent ceramic rings, one of the ceramic rings being provided with protrusions and the other ceramic ring being provided with grooves that mate with the protrusions.

8. The sand control screen of claim 7, wherein the protrusions are V-shaped protrusions and the grooves are V-shaped grooves.

9. The sand control screen of any one of claims 1-5, comprising a plurality of support ribs disposed in the annular cavity, the plurality of support ribs being circumferentially spaced about the axis of the casing.

10. The sand control screen of claim 9, wherein the sand control screen comprises an upper pressure cap and a lower retainer ring, the upper pressure cap and the lower retainer ring are connected to both ends of the casing, respectively, and the ceramic rings are positioned between the upper pressure cap and the lower retainer ring and abut against the upper pressure cap and the lower retainer ring, respectively.

11. The sand control screen of claim 10, wherein the lower retainer ring has an axial hole formed therein, the support ribs have first ends provided with protrusions, the support ribs are inserted into the axial hole, and the protrusions abut against an end surface of the lower retainer ring remote from the upper gland.

12. The sand control screen of claim 10, wherein the inner wall of the sleeve is provided with a stepped portion, the second end of the support rib is provided with a bent portion abutting against the stepped portion, and the acting force applied by the stepped portion to the bent portion is directed in a direction away from the lower retainer ring.

13. The sand control screen of any one of claims 1 to 5, wherein the sand control screen comprises a universal joint, the universal joint comprising an upper joint and a lower joint in communication, the upper joint being universally rotatable with respect to the lower joint;

the upper joint is connected with one end of the sleeve, and/or the lower joint is connected with one end of the sleeve.

14. The sand control screen of claim 13, wherein the universal joint comprises a ball joint, the lower joint being connected to one end of the ball joint, the other end of the ball joint being spherically engaged with the upper joint.

15. The sand control screen of claim 14, wherein the upper joint is provided with a first inner spherical surface and the ball joint is provided with an outer spherical surface that mates with the first inner spherical surface.

16. The sand control screen of claim 15, wherein the universal joint includes an outer compression cap coupled to the upper joint for compressing the ball joint to the upper joint.

17. The sand control screen of claim 16, wherein the outer compression cap is provided with a second inner spherical surface that mates with the outer spherical surface.

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