Sand control packer assembly

Abstract

The application relates to the technical field of sand prevention and filling of oil production wells, and discloses a novel sand prevention and filling device which comprises an upper joint assembly and a hydraulic movable assembly. A hydraulic movable assembly is arranged below the upper joint assembly. The hydraulic movable assembly comprises a hydraulic cylinder outer sleeve, a seat sealing pipe and a piston ring. The piston ring is arranged between the inner wall of the hydraulic cylinder outer sleeve and the outer wall of the seat sealing pipe. A seat sealing water eye is arranged on the seat sealing pipe. The seat sealing water eye is in communication with the space between the piston ring and the upper joint assembly. A sand prevention sleeve is arranged in the inner cavity of the seat sealing pipe. The sand prevention sleeve can move up and down along the inner cavity of the seat sealing pipe and can close or open the communication between the seat sealing water eye and the inner cavity of the seat sealing pipe. In the sand washing operation process, the sand prevention sleeve can effectively prevent sand from entering the inner part of the hydraulic cylinder, avoid the blockage of the seat sealing channel and ensure the smooth implementation of the subsequent seat sealing operation.

Description

Technical Field

[0001] This invention relates to the field of sand control and backfilling technology for oil wells, and in particular to a novel sand control and backfilling device. Background Technology

[0002] In oil and gas extraction, especially when extracting from loose sandstone reservoirs using horizontal wells, large amounts of sand often accumulate in the wellbore when sand production is severe. When running sand control tubing into the well, the tubing tip is highly susceptible to obstruction at these sand-accumulated 'sand beds' or 'sand bridges,' a phenomenon known as 'sand blockage.' Sand blockage can directly prevent the sand control tubing from reaching the intended design layer. Forcing its entry under pressure can easily cause tubing bending, screen rupture, or even sand jamming in the tubing, severely impacting the construction progress and well completion quality.

[0003] To address the sand resistance problem, existing processes commonly employ a "flush-and-run" method. This involves pumping flushing fluid to the bottom of the well via reverse circulation to impact and carry sand back to the surface while simultaneously lowering the tubing string. However, during backflushing, sand particles carried by the flushing fluid repeatedly scour the well and can easily enter the gap between the setting water hole and the hydraulic cylinder of the sand-control packing tool, causing blockage of the hydraulic setting channel. Once the setting channel is blocked by sand particles, even if the sand resistance is successfully broken, the packer cannot complete the setting, ultimately leading to packing failure. Furthermore, after the setting is lost, the setting components are susceptible to the effects of continuous impacts and vibrations generated during packing and production due to the withdrawal of downward pressure. This can result in a decrease in slip preload and loosening. Over prolonged use, the resilience of the rubber sleeve also decreases, leading to insufficient sealing pressure and affecting the setting effect.

[0004] In summary, there is an urgent need for a new type of sand-proof filling device that can effectively prevent sand from entering the liquid cylinder during sand flushing operations, avoid blockage of the sealing channel, ensure smooth subsequent sealing operations, and continue to provide pre-tightening force to the sealing assembly after the operation is stopped, thereby extending the effective time of the sealing. Summary of the Invention

[0005] In view of the problem that sand and gravel can easily cause blockage of hydraulic sealing channels during sand flushing operations in existing technologies, a new type of sand-proof filling device is proposed. This device can effectively prevent sand from entering the hydraulic cylinder during sand flushing operations, avoid blockage of the sealing channels, ensure smooth sealing operations, and continue to provide pre-tightening force to the sealing components after the operation is stopped, thus extending the effective time of the sealing.

[0006] To solve the above problems, the technical solution of the present invention is as follows: A novel sand-proof filling device includes an upper connector assembly and a hydraulic movable assembly. The hydraulic movable assembly is located below the upper connector assembly. The hydraulic movable assembly includes a hydraulic cylinder outer sleeve, a seat seal tube, a piston ring, and a pressure sleeve. The piston ring is positioned between the inner wall of the hydraulic cylinder outer sleeve and the outer wall of the seat seal tube. The pressure sleeve is located below the piston ring. The seat seal tube has a seat seal water eye that communicates with the space between the piston ring and the upper connector assembly. A sand-proof sleeve is located within the inner cavity of the seat seal tube. The sand-proof sleeve can move up and down along the inner cavity of the seat seal tube and can seal or... The connection between the sealing water eye and the inner cavity of the sealing tube is opened; the pressure sleeve includes a sliding tube string, a locking anchor, a first collar, a second collar, and a drive sleeve; a sealing assembly is provided under the second collar, a portion of the upper end face of the second collar is connected to the first collar via a spring, a plurality of the locking anchors are provided on the first collar, and the sliding tube string is connected above the locking anchors, wherein the drive sleeve causes the sealing assembly to complete the sealing under the push of the piston ring, and compresses the spring to cause the locking anchor to move radially, and the compressed spring provides downward pressure to the sealing assembly after being released.

[0007] As a preferred technical solution, the sandproof sleeve is provided with a spare ball seat, which can be sealed by a sealing ball adapted to the spare ball seat.

[0008] As a preferred technical solution, the setting assembly includes a setting rubber sleeve and an anchoring mechanism. The anchoring mechanism is fixed between the setting rubber sleeve and the well wall under the downward pressure of the pressure sleeve, and the setting rubber sleeve expands under the downward pressure of the pressure sleeve.

[0009] As a preferred technical solution, the seat sealing assembly is sleeved on the central sleeve, and the central sleeve is sleeved on the release assembly.

[0010] As a preferred technical solution, the release assembly includes a reverse thread provided on the seated tube, through which the outer wall of the seated tube is connected to the inner wall of the central sleeve, and the seated tube is sleeved on the inner central tube.

[0011] As a preferred technical solution, a release sleeve is provided between the seat seal tube and the inner center tube. The release sleeve is connected to the inner center tube by a release scissor pin, wherein the release sleeve ensures that the seat seal tube and the center sleeve are tightly connected.

[0012] As a preferred technical solution, the driving sleeve includes a lower connecting part, a driving wedge, and an upper connecting part. The upper connecting part is connected to the inner wall of the sliding tube column through a locking shear pin, which can be cut under pressure. The driving wedge is adapted to and connected to the locking anchor, and the up-and-down movement of the driving wedge drives the radial movement of the locking anchor. The lower connecting part is connected to the upper end face of the first collar.

[0013] As a preferred technical solution, the locking anchor includes sidewall anchor teeth, a driving inclined surface, and a connecting bottom surface. The driving inclined surface is adapted to the driving wedge block. The lower end surface of the connecting bottom surface is always in contact with the upper end surface of the second sleeve ring. The sidewall anchor teeth are used for anchoring to the well wall.

[0014] The beneficial effects of this invention are: During the sand flushing operation, the flushing fluid impacts the sand-blocking area from the annulus between the wellbore and the sand-control filling device. The flushed sand fluid eventually flows upward and is discharged through the inner cavity of the inner central tube, the inner cavity of the upper end of the setting pipe, the inner cavity of the sand-control casing, and the inner cavity of the upper connector assembly. During this process, the setting water hole is blocked by the sand-control casing, preventing the sand fluid from entering and clogging the setting water hole, ensuring the smooth progress of subsequent setting operations. Furthermore, the sand-control casing can be lowered under pressure to expose the setting water hole, meeting the requirements of the setting operation and fully guaranteeing the reliability of subsequent sand-control filling construction.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a half-sectional schematic diagram of the novel sand-proof filling device of the present invention; Figure 2 for Figure 1 A partially enlarged schematic diagram of the upper connector assembly and hydraulic moving assembly shown in Figure A; Figure 3 for Figure 1 A partially enlarged schematic diagram of the seat assembly and release assembly shown in Figure B; Figure 4 Schematic diagram showing the repositioning of the lower section of the rear seat seal after the slip sleeve disengages from the release mechanism; Figure 5 This is a three-dimensional schematic diagram of another novel sand-proof filling device of the present invention; Figure 6 for Figure 5 Schematic diagram of the new sand-proof filling device shown. Figure 1 ; Figure 7 for Figure 6 A partially enlarged schematic diagram of the pressure sleeve of the new sand-proof filling device shown in C; Figure 8 for Figure 5 Schematic diagram of the new sand-proof filling device shown. Figure 2 ; Figure 9 for Figure 8 A partially enlarged schematic diagram of the pressure sleeve of the new sand-proof filling device shown in Figure D; Figure 10 for Figure 9 The cross-sectional view in section E shows a schematic diagram of the anti-slip serrations and anti-detachment rod.

[0017] The reference numerals and components involved in the accompanying drawings are shown below: 1. Upper connector assembly; 2. Hydraulic moving assembly; 3. Inner center tube; 4. Sealing seal water eye; 5. Sandproof sleeve; 6. Sealing ball; 7. Sealing assembly; 8. Center sleeve; 9. Release assembly; 10. Spring; 11. Upper cylindrical sleeve; 12. Conical sleeve; 13. Lower cylindrical sleeve; 21. Hydraulic cylinder outer sleeve; 22. Sealing tube; 23. Piston ring; 24. Pressure sleeve; 25. Sliding tube string; 26. Locking anchor; 27. First collar; 28. Second collar; 29. Drive sleeve; 51. Spare ball seat; 71. Sealing rubber sleeve; 72. Anchoring mechanism; 91. Reverse thread; 92. Release slip sleeve; 93. Release shear pin; 261. Side wall anchor teeth; 262. Drive inclined surface; 263. Connecting bottom surface; 264. Anti-slip serrations; 265. Anti-disengagement rod; 266. Guide groove; 291. Drive wedge block; 292. Upper connecting part; 293. Lower connecting part; 294. Locking shear pin; 721. Wedge-shaped guide block; 722. Anchor claw. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To better understand the novel sand control and filling device provided in this embodiment, a brief introduction to existing sand control and filling tools is given below. The existing sand control and filling tools refer to the horizontal well sealing and filling combined production process tubing and method disclosed in Chinese patent application No. 2021111324790, which includes an upper connector, hydraulic cylinder, central tube, seat seal shear pin, rubber sleeve, slips, filling return fluid and backwash well channel, filling port pin, filling channel, filling port sliding sleeve, external filling port closing mechanism, backwash interlayer tube, internal filling port closing mechanism, flushing pipe, safety joint, screen pipe, backwash valve, rubber sleeve, bottom packer, and external sand flushing device. This solution completes sand flushing, two-stage sealing, and filling functions in one tubing run. First, it can perform reverse circulation well washing, allowing the tubing to be flushed and lowered simultaneously during the tubing lowering process, solving the problem of difficulty in lowering process tubing in horizontal wells due to sand production. However, the connection hole between the central tube and the hydraulic cylinder is exposed inside the central tube, making it easy to be blocked by sand and gravel during the sand flushing process, causing the hydraulic cylinder to be unable to move and thus preventing the smooth completion of subsequent operations.

[0020] To resolve the above issues, please refer to the appendix. Figure 1 Appendix Figure 2 , Figure 1 This is a half-sectional schematic diagram of the novel sand-control and filling device of the present invention. Figure 2 for Figure 1 A partially enlarged schematic diagram of the upper connector assembly and hydraulic movable assembly shown in Figure A; the novel sand-proof filling device of the present invention includes an upper connector assembly 1 and a hydraulic movable assembly 2; the upper connector assembly 1 is composed of an upper cylindrical sleeve 11, a conical sleeve 12, and a lower cylindrical sleeve 13, and the hydraulic movable assembly 2 is provided below the upper connector assembly 1. The hydraulic movable assembly 2 includes a hydraulic cylinder outer sleeve 21, a seat seal tube 22, and a piston ring 23. The hydraulic cylinder outer sleeve 21 is sleeved on the outer wall of the lower cylindrical sleeve 13 and is engaged below the conical sleeve 12; the upper section of the outer wall of the seat seal tube 22 is in close contact with the inner wall of the lower cylindrical sleeve 13, and similarly... A piston ring 23 is provided in the annular cavity between the inner wall of the hydraulic cylinder outer sleeve 21 and the outer wall of the upper section of the seat seal tube 22. The piston ring 23 can move in the cavity. The middle section of the seat seal tube 22 is sleeved on the inner central tube 3. The inner cavity of the inner central tube 3 is connected to the inner cavity of the upper connector assembly 1. Preferably, the hydraulic moving assembly 2 also includes a pressure sleeve 24. The upper section of the pressure sleeve 24 is located in the annular cavity where the piston ring 23 is located, and the upper end face of the pressure sleeve 24 is in contact with the lower end face of the piston ring 23. When the piston ring 23 moves down, it pushes the pressure sleeve 24 to move down synchronously.

[0021] In the novel sand-proof filling device of the present invention, a sealing pipe 22 is provided with a sealing water eye 4. The sealing water eye 4 is at least one through hole provided on the sealing pipe 22. The sealing water eye 4 connects the hollow inner cavity of the sealing pipe 22 with the space between the upper connector assembly 1 and the piston ring 23. That is, the high-pressure liquid in the inner cavity of the sealing pipe 22 can enter the space between the piston ring 23 and the upper connector assembly 1 through the sealing water eye 4. Preferably, in order to prevent the sealing water eye 4 from being blocked before normal operation, a sand-proof sleeve 5 is provided in the upper section of the inner cavity of the sealing pipe 22. The outer wall of the sand-proof sleeve 5 is in close contact with the inner wall of the sealing pipe 22 where the sealing water eye 4 is located, which is used to block the communication between the sealing water eye 4 and the inner cavity of the sealing pipe 22. The sand-proof sleeve 5 can be pressed to make the inner wall of the sealing pipe 22 move down and finally expose the sealing water eye 4. Preferably, in some embodiments, the top of the sand-proof casing 5 is provided with a spare ball seat 51. The spare ball seat 51 is an inverted frustum-shaped groove structure with a large diameter opening facing the wellhead. The spare ball seat 51 can be sealed by a sealing ball 6 that is compatible with the spare ball seat 51.

[0022] Below the hydraulic movable assembly 2 is a setting assembly 7, which includes a setting rubber sleeve 71 and an anchoring mechanism 72. During setting, the setting rubber sleeve 71 is subjected to radial force through the pressure sleeve 24, causing it to expand radially and fit tightly against the well wall, forming a seal; please refer to the appendix. Figure 3 , Figure 3 for Figure 1 The enlarged schematic diagram of the sealing assembly and release assembly shown in Figure B shows that the anchoring mechanism 72 includes a wedge-shaped guide block 721, on which an anchor claw 722 is connected. Through the relative movement of the wedge-shaped guide block 721, the anchor claw 722 is engaged with the well wall.

[0023] The setting assembly 7 is sleeved on the central casing 8. The setting assembly 7 can achieve wellbore retention of the corresponding tool by separating the release assembly 9. In this embodiment, please refer to the appendix again. Figure 3 The release component 9 is a reverse thread 91 provided on the seated pipe 22 and the central sleeve 8. The central sleeve 8 is threadedly connected to the lower section of the seated pipe 22 through the reverse thread 91. When the seated pipe 22 and the central sleeve 8 rotate relative to each other and disengage, the release operation is achieved. It should be noted that the reverse thread 91 enables the novel sand-controlling filling device of the present invention to achieve the release operation through forward rotation. In some preferred embodiments, in order to cope with the difficult forward rotation release conditions such as horizontal wells, the release component 9 also includes a release sliding sleeve 92. The release sliding sleeve 92 is provided between the lower section of the seated pipe 22 and the outer wall of the inner central pipe 3, and is used to expand the lower section of the seated pipe 22 with the reverse thread 91, and to make it mesh with the reverse thread 91 on the central sleeve 8, that is, as shown in the figure. Figure 4 As shown, Figure 4The diagram illustrates the repositioning of the lower section of the seated tube after the release sleeve disengages. The lower section of the seated tube 22 is an internally forced expansion tube with external threads and restorative elasticity. Several gaps are evenly distributed along the circumference of the internally forced expansion tube. Initially, the reverse thread 91 on the outside of the internally forced expansion tube is in a gradually decreasing diameter inward-facing state. A release scissor 93 is provided on the release sleeve 92, connected to the inner central tube 3 via the release scissor 93, positioning the release sleeve 92 at the location of the reverse thread 91. Supported by the release sleeve 92, the lower section of the seated tube 22 is fixed to the central sleeve 8 via the reverse thread 91. In this embodiment, the release scissor 93 breaks under shearing force, allowing the release sleeve 92 to move relative to the inner central tube 3 and the seated tube 22, causing the lower section of the seated tube 22 to lose support and separate from the central sleeve 8, thus completing the release operation.

[0024] The novel sand-control and filling device of this invention is used as follows: During the sand flushing operation, the flushing liquid impacts the sand-control area from the annulus between the well wall and the filling device. The flushed sand liquid is discharged upward through the inner cavity of the inner central tube 3, the inner cavity of the upper end of the sealing tube 22, the inner cavity of the sand-control sleeve 5, and the inner cavity of the upper connector assembly 1. During this process, the sealing water hole 4 is blocked by the sand-control sleeve 5, preventing the sand liquid from entering and blocking the sealing water hole 4, ensuring the smooth progress of subsequent sealing operations. During sealing, the bottom filling valve is closed, and the sand-control sleeve 5 moves downward under pressure, exposing the sealing water hole 4. The liquid is pressed through the sealing water hole 4 to the top of the piston ring 23, pushing the piston ring 23 downward, thereby pushing the anchor claw 722 of the anchoring mechanism 72 to move towards the well wall and engage. After the anchor claw 722 is fixed, the sealing rubber sleeve 71 expands under pressure and seals the well wall and the filling device. The annular area between them is used to complete the setting; preferably, if the bottom filling valve is accidentally opened and the setting is insufficient, the spare ball seat 51 set on the upper part of the sand control casing 5 can be put into the sealing ball 6, i.e., the spare steel ball, to achieve re-setting by sealing the spare ball seat 51, avoiding the risk of setting failure and ensuring the reliability of sand control filling construction; when performing the release operation, the reverse thread 91 between the central casing 8 and the setting pipe 22 is disengaged by forward rotation to complete the release. However, when it is difficult to release the release by forward rotation due to working conditions such as horizontal wells, the release sleeve 92 can be sheared by pressure operation under pressure and the release shear nail 93 is moved down. After the lower section of the setting pipe 22 loses support, it shrinks in diameter, i.e., the diameter of the lower section of the setting pipe 22 becomes smaller, so that the reverse thread 91 connected to the central casing 8 moves away from each other and disengages, thereby achieving reverse disengagement and completing the release, effectively solving the release problem under complex working conditions. It should be noted that the bottom of the novel sand-control filling device of this invention can be connected to a filling tool for corresponding filling operations. The connected tool does not change the final flow path of the sand liquid during sand flushing; therefore, it does not affect the sand-control and anchoring functions of this invention. Figure 1The white squares on the contact surfaces between the various components indicate the installation positions of the sealing rings. The sealing method is existing technology and will not be described or illustrated further below.

[0025] Please see the appendix Figure 5 , Figure 6 , Figure 5 This is a three-dimensional schematic diagram of another novel sand-controlling filling device of the present invention. Figure 6 for Figure 5 Schematic diagram of the new sand-proof filling device shown. Figure 1 To prevent premature failure of the sealing effect of the wellhead seal due to high temperatures, vibrations, and other environmental factors after the well is abandoned, and to enable the well-keeping tool to have an adaptive sealing locking function to extend the service life of the wellhead seal structure, please refer to the appendix in this embodiment. Figure 7 , Figure 7 for Figure 6 The enlarged schematic diagram of the pressure sleeve of the novel sand-control filling device shown in Figure C is shown. The pressure sleeve 24 includes a sliding tube 25, a locking anchor 26, a first collar 27, a second collar 28, and a drive sleeve 29. The outer wall of the sliding tube 25 is fitted with the inner wall of the hydraulic cylinder outer sleeve 21, and its upper end face is fitted with the lower end face of the piston ring 23. The lower end face is connected to the locking anchor 26. (See attached diagram for details.) Figure 8 Appendix Figure 9 , Figure 8 for Figure 5 Schematic diagram of the new sand-proof filling device shown. Figure 2 , Figure 9 for Figure 8 The enlarged schematic diagram of the pressure sleeve of the novel sand-proof filling device shown in Figure D shows that the locking anchor 26 includes side wall anchor teeth 261 for anchoring and engaging. A driving inclined surface 262 is provided on the inner side of the side wall anchor teeth 261. A connecting bottom surface 263 is provided at the bottom of the side wall anchor teeth 261. A driving wedge block 291 on the driving sleeve 29 is placed in the gap between the connecting bottom surface 263 and the driving inclined surface 262. The connecting bottom surface 263 is connected to the upper end face of the first collar 27. The first collar 27 is connected to the second collar 28 through the spring 10. The second collar 28 is connected to the upper surface of the sealing rubber cylinder 71. The driving sleeve 29 includes an upper connecting part 29. 2. The driving wedge 291 and the lower connecting part 293, the upper connecting part 292 of the driving sleeve 29 is located inside the sliding column 25, and the upper connecting part 292 is engaged with the lower inner wall of the sliding column 25 by a number of locking shear pins 294. The locking shear pins 294 can withstand a certain pressure. The driving wedge 291 on the driving sleeve 29 is adapted to and fits the driving inclined surface 262 through the upper inclined surface. When the driving wedge 291 and the locking anchor 26 are relatively displaced, the side wall anchor teeth 261 move away from the driving sleeve 29. The lower connecting part 293 of the driving sleeve 29 is located inside the spring 10 and is also connected to the second collar 28.

[0026] In the setting operation of the novel sand-control filling device of this embodiment, when the piston ring 23 moves downward to apply downward pressure to the sliding tube string 25, initially, since the drive sleeve 29 is connected to the sliding tube string 25 through the locking shear pin 294, its downward pressure is directly transmitted to the second sleeve ring 28 through the drive sleeve 29 and causes the setting assembly 7 to complete the setting. During this process, the locking anchor 26 and the drive wedge 291 remain relatively stationary. When the setting assembly 7 completes the setting, the force on the sliding guide gradually increases, and when the pressure exceeds a certain threshold... When the locking shear pin 294 is sheared by the shearing force, the spring 10 is compressed. The locking anchor 26 begins to move downward relative to the driving wedge 291. Guided by the inclined plane, the locking anchor 26 begins to move radially towards the well wall and forms an anchor with the well wall through the side wall anchor teeth 261. After the operation is released, the compressed spring 10 generates a continuous preload force on the second ring 28 and the setting assembly 7 below it, such as the setting sleeve 71, to prevent the sleeve from rebounding, thereby ensuring the stability of the seal and extending the working time of the setting assembly. It should be noted that after the locking anchor 26 is translated, the connecting bottom surface 263 remains connected to the second ring 28. Similarly, the upper end face of the locking anchor 26 remains connected to the bottom of the sliding tube column 25. Interlocking anti-slip serrations 264 can be provided between the connecting surfaces of the driving inclined surface 262 and the driving wedge block 291, and between the contact surfaces of the wedge-shaped guide block 721 and the anchor claw 722, to prevent relative movement under the action of the elastic force after release, thereby ensuring the effectiveness of the elastic force on the sealing rubber cylinder 71. In some preferred embodiments, please refer to the appendix. Figure 10 , Figure 10 for Figure 9 The cross-sectional view in section E shows a schematic diagram of the anti-slip serrations and anti-detachment rods. Anti-detachment rods 265 can be installed on the upper and lower end faces of the locking anchor 26. Correspondingly, guide grooves 266 are provided on the adjacent connecting surfaces to allow the anti-detachment rods 265 to move, which is used to prevent the locking anchor 26 from falling off from the side. Similarly, corresponding anti-detachment mechanisms can be installed on the upper and lower surfaces of the anchor claws 722 of the anchoring structure.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and additions without departing from the principle of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention.

Claims

1. A sand-controlling and filling device, comprising an upper connector assembly and a hydraulically movable assembly; the hydraulically movable assembly is disposed below the upper connector assembly, the hydraulically movable assembly comprising a hydraulic cylinder outer sleeve, a seat seal tube, a piston ring, and a pressure sleeve, wherein the piston ring is disposed between the inner wall of the hydraulic cylinder outer sleeve and the outer wall of the seat seal tube, the pressure sleeve is disposed below the piston ring, and the seat seal tube is provided with a seat seal water hole, the seat seal water hole communicating with the space between the piston ring and the upper connector assembly, characterized in that... A sand-proof sleeve is provided in the inner cavity of the setting tube. The sand-proof sleeve can move up and down along the inner cavity of the setting tube and can close or open the communication between the setting water eye and the inner cavity of the setting tube. The pressure sleeve includes a sliding tube string, a locking anchor, a first collar, a second collar, and a driving sleeve. A setting assembly is provided under the second collar. A portion of the upper end face of the second collar is connected to the first collar by a spring. A plurality of the locking anchors are provided on the first collar. The sliding tube string is connected above the locking anchors. The driving sleeve causes the setting assembly to complete the setting under the push of the piston ring and compresses the spring to make the locking anchor move radially. After the compressed spring is released, it provides downward pressure to the setting assembly.

2. The sand-control and backfilling device according to claim 1, characterized in that, The sandproof sleeve is equipped with a spare ball seat, which can be sealed by a sealing ball that is compatible with the spare ball seat.

3. The sand-control and backfilling device according to claim 1, characterized in that, The setting assembly includes a setting rubber sleeve and an anchoring mechanism. The anchoring mechanism is fixed between the setting rubber sleeve and the well wall under the downward pressure of the pressure sleeve, and the setting rubber sleeve expands under the downward pressure of the pressure sleeve.

4. The sand-control and backfilling device according to claim 1, characterized in that, The seat sealing assembly is fitted onto the central sleeve, and the central sleeve is fitted onto the release assembly.

5. The sand-control and backfilling device according to claim 4, characterized in that, The release assembly includes a reverse thread on the seated tube, through which the outer wall of the seated tube is connected to the inner wall of the central sleeve, and the seated tube is sleeved on the inner central tube.

6. The sand-control and backfilling device according to claim 5, characterized in that, A release sleeve is provided between the seat seal tube and the inner center tube. The release sleeve is connected to the inner center tube by a release scissor pin. The release sleeve ensures that the seat seal tube and the center sleeve are tightly connected.

7. The sand-control and backfilling device according to claim 1, characterized in that, The drive sleeve includes a lower connecting part, a drive wedge, and an upper connecting part. The upper connecting part is connected to the inner wall of the sliding tube column through a locking shear pin, which can be cut under pressure. The drive wedge is adapted to and connected to the locking anchor. The up and down movement of the drive wedge drives the radial movement of the locking anchor. The lower connecting part is connected to the upper end face of the first collar.

8. The sand-control and backfilling device according to claim 7, characterized in that, The locking anchor includes sidewall anchor teeth, a driving inclined surface, and a connecting bottom surface. The driving inclined surface is adapted to the driving wedge block. The lower end surface of the connecting bottom surface is always in contact with the upper end surface of the second sleeve ring. The sidewall anchor teeth are used to anchor to the well wall.

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