Packer matched with continuous chemical water plugging and acidification

Abstract

When the continuous chemical water plugging and acidification matched packer is used, the top of a release pipe shell is connected with an oil pipe, then the whole packer is lowered into a well, reaches a set depth position and is rotated to a center pipe in place, an annular driving disc pushes the front end of a clamping sleeve to expand outwards, and a tooth-shaped structure and a well wall are clamped and positioned; the central pipe is pressed, the pressure enables the sealing ball to block the front end of the central pipe, the pressure continues to be increased, the two annular blocking plugs are pushed to communicate the annular capsule and the central pipe, the annular capsule expands to make close contact with the well wall, and setting is completed. Under the state, chemical water plugging or acidification is carried out on the underground through the guide pipe, the one-way valve, the third radial hole, the second radial hole and the first radial hole in sequence. The whole packer is simple in structure, high in integration level and convenient to operate.

Description

Technical Field

[0001] The utility model relates to a packer for oil field production, in particular to a packer for continuous chemical water plugging and acidification. Background Art

[0002] The packer is a production device for oil field production, and is a special tool used to isolate oil, gas, and water layers in downhole casing or open hole. When in use, the packer needs to be lowered to the target layer, and after the external force is applied, the packer is released to seal the packer, separating the oil (gas, water) layers above and below the packer, and then the target layer is constructed. After the construction is completed, the packer is unsealed to complete the entire construction process.

[0003] At present, when continuous chemical water plugging or acidizing is performed on the formation, it is also necessary to use a packer for pre-plugging. However, there are the following problems: the integration of existing chemical water plugging or acidizing facilities and packers needs to be improved, and another part of the existing highly concentrated integrated supporting equipment has a complex structure. Utility Model Content

[0004] The utility model aims to provide a packer for continuous chemical water plugging and acidification matching, which has a simple structure and reliable use, solves the above problems, has high integration and is easy to operate.

[0005] The technical solution of the utility model is:

[0006] A continuous chemical water plugging and acidizing packer, comprising a release tube shell, a center tube arranged in the release tube shell, and a clamping structure arranged at the front end of the release tube shell, the front end of the center tube leads to the front end of the release tube shell and has a sealing ball built in, and its technical highlights are: the outer wall of the center tube is in contact with the inner wall of the release tube shell, the front end of the release tube shell is provided with a reduced diameter section and the inner surface of the reduced diameter section is provided with an internal thread, and the outer wall of the front part of the center tube is provided with an external thread matching the internal thread; the release tube shell is provided with an axial hollow cavity on the tube wall near the clamping structure, two annular stoppers are arranged oppositely in the axial hollow cavity, a compression spring is arranged between the opposite ends of the two annular stoppers and the corresponding cavity bottom surface, and the outer wall of the release tube shell is provided with an annular stopper at the position corresponding to the annular stopper shaped groove, an annular capsule is embedded in the annular groove, a first through hole which can be communicated with the axial hollow cavity is provided at the position of the annular plug at the bottom of the annular groove, a second through hole is provided on the inner wall of the release tube shell at a position corresponding to the two annular plugs, and a third through hole corresponding to the second through hole is provided on the center tube; a plurality of first radial holes are evenly provided on the tube wall of the release tube shell at a position close to the axial hollow cavity, a second radial hole corresponding to the first radial hole is provided on the center tube, a one-way valve is threadedly connected to the center tube at the pipe section where the second radial hole is located, a conduit is connected to the inlet of the one-way valve, a third radial hole which is communicated with the second radial hole is provided on the outer peripheral wall of the one-way valve, and an axial hole which is communicated with the center tube is provided on the shell of the one-way valve.

[0007] In the above-mentioned continuous chemical water plugging and acidizing packer, axial guide rods are fixed to the opposite back surfaces of the two annular stoppers respectively, and the bottom surface of the axial hollow cavity of the release tube shell is provided with a guide hole matching the axial guide rod.

[0008] The above-mentioned continuous chemical water plugging and acidizing matching seal, the fixing structure includes a fixing sleeve wrapped around the outside of the reduced diameter section, and an annular drive disk fixed to the outer side wall of the front port of the center pipe. The front part of the fixing sleeve is a two-petal structure, and its inner wall is provided with a conical contact surface that cooperates with the outer ring surface of the annular drive disk. The front outer wall of the fixing sleeve is provided with a tooth-shaped structure.

[0009] In the above-mentioned continuous chemical water plugging and acidizing packer, the number of the first through holes in each annular groove is multiple and evenly distributed around the annular stopper.

[0010] In the above-mentioned continuous chemical water plugging and acidizing packer, the number of the second through holes and the number of the third through holes are respectively multiple and equal.

[0011] In the above-mentioned continuous chemical water plugging and acidizing packer, the number of the first radial holes, the second radial holes and the third radial holes are multiple and equal.

[0012] The beneficial effects of the utility model are:

[0013] When in use, release the top of the tube shell to connect with the oil pipe, then lower the entire packer into the well, reach the set depth, rotate the center pipe in place, so that the annular drive disc pushes the front end of the clamping sleeve to expand outward, and the tooth-shaped structure is clamped and positioned with the well wall; pressurize the center pipe, the pressure makes the sealing ball block the front end of the center pipe, continue to increase the pressure, the two annular plugs are pushed to connect the annular capsule and the center pipe, the annular capsule expands and is in close contact with the well wall, and the sealing is completed. In this state, chemical water plugging or acidification is carried out in the well through the catheter, the one-way valve, the third radial hole, the second radial hole and the first radial hole in turn. The entire packer has a simple structure and high integration, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the external structure of the one-way valve of the utility model.

[0016] In the figure: 1. release tube shell, 2. center tube, 3. one-way valve, 4. axial guide rod, 5. compression spring, 6. annular capsule, 7. annular stopper, 8. clamping sleeve, 9. tooth-shaped structure, 10. annular drive disk, 11. sealing ball, 12. internal thread, 13. guide hole, 14. axial hollow cavity, 15. second through hole, 16. third through hole, 17. first through hole, 18. second radial hole, 19. first radial hole, 20. catheter, 21. axial hole. DETAILED DESCRIPTION

[0017] The utility model is described in detail according to the accompanying drawings of the specification.

[0018] like Figure 1 , Figure 2 As shown, the continuous chemical water plugging and acidizing packer comprises a release shell 1, a central pipe 2 arranged in the release shell 1, and a clamping structure arranged at the front end of the release shell 1. The front end of the central pipe 2 leads out of the front end of the release shell 1 and has a sealing ball 11 built in it.

[0019] The outer wall of the central tube 2 is attached to the inner wall of the release tube shell 1, the front end of the release tube shell 1 is provided with a reduced diameter section and the inner surface of the reduced diameter section is provided with an internal thread 12, and the front outer wall of the central tube 2 is provided with an external thread matching the internal thread 12. In this embodiment, the clamping structure includes a clamping sleeve 8 wrapped around the outer side of the reduced diameter section, and an annular driving disk 10 fixed to the outer side wall of the front port of the central tube 2. The front part of the clamping sleeve 8 is a two-petal structure, and its inner wall is provided with a conical contact surface matching the outer ring surface of the annular driving disk 10, and the front outer wall of the clamping sleeve 8 is provided with a tooth-shaped structure 9.

[0020] The release tube shell 1 is provided with an axial hollow cavity 14 on the tube wall near the clamping structure, and two annular stoppers 7 are arranged oppositely in the axial hollow cavity 14. A compression spring 5 is arranged between the opposite ends of the two annular stoppers 7 and the corresponding cavity bottom surface. The outer wall of the release tube shell 1 is provided with an annular groove at the position corresponding to the annular stopper 7, and an annular capsule 6 is embedded in the annular groove. The groove bottom of the annular groove is provided with a first through hole 17 that can communicate with the axial hollow cavity 14 at the position corresponding to the annular stopper 7. The inner wall of the release tube shell 1 is provided with a second through hole 15 at the position corresponding to the position between the two annular stoppers 7, and the central tube 2 is provided with a third through hole 16 corresponding to the second through hole 15. In this embodiment, axial guide rods 4 are fixed to the opposite back surfaces of the two annular stoppers 7, and the cavity bottom surface of the axial hollow cavity 14 of the release tube shell 1 is provided with a guide hole 13 that cooperates with the axial guide rod 4. The number of the first through holes 17 of each annular groove is multiple and evenly distributed around the annular stopper 7. The number of the second through holes 15 and the third through holes 16 are multiple and equal.

[0021] The tube wall of the release tube shell 1 is evenly provided with a plurality of first radial holes 19 at a position close to the axial hollow cavity 14, the central tube 2 is provided with a second radial hole 18 corresponding to the first radial hole 19, the central tube 2 is threadedly connected with a check valve 3 at the tube section where the second radial hole 18 is located, the inlet of the check valve 3 is connected with a conduit 20, the outer peripheral wall of the check valve 3 is provided with a third radial hole connected with the second radial hole 18, and the housing of the check valve 3 is provided with an axial hole 21 connected with the central tube 2. The number of the first radial holes 19, the second radial holes 18 and the third radial holes are respectively multiple and equal.

[0022] Working principle:

[0023] 1. When in use, release the free end of the tube shell 1 to connect with the oil pipe, then lower the entire packer into the well, reach the set depth position, rotate the center pipe 2 in place, so that the annular drive disc 10 pushes the front end of the clamping sleeve 8 to expand outward, and the tooth-shaped structure 9 is clamped and positioned with the well wall; pressurize the center pipe 2, the pressure makes the sealing ball 11 block the front end of the center pipe 2, continue to increase the pressure, the two annular stoppers 7 overcome the force of the compression spring 5 and are pushed to connect the annular capsule 9 and the center pipe 2, the annular capsule 9 expands and is in close contact with the well wall, and the setting is completed. In this state, chemical water plugging or acidification is carried out in the well through the guide tube 20, the one-way valve 3, the third radial hole, the second radial hole 18 and the first radial hole 19 in turn.

[0024] 2. After the work is completed, the pressure applied to the central tube 2 is released, and the central tube 2 is rotated in the opposite direction, the annular drive disc 10 retreats, the front end of the clamping sleeve 8 retracts, the tooth-shaped structure 9 is separated from the well wall, and the packer can be lifted out.

[0025] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A continuous chemical water plugging and acidizing packer, comprising a release shell, a central tube arranged in the release shell, and a clamping structure arranged at the front end of the release shell, wherein the front end of the central tube leads out of the front end of the release shell and has a sealing ball built in, characterized in that: The outer wall of the center tube is in contact with the inner wall of the release tube shell, the front end of the release tube shell is provided with a reduced diameter section and the inner surface of the reduced diameter section is provided with an internal thread, and the outer wall of the front part of the center tube is provided with an external thread matching the internal thread; the release tube shell is provided with an axial hollow cavity on the tube wall near the clamping structure, and two annular plugs are relatively provided in the axial hollow cavity, and a compression spring is provided between the opposite ends of the two annular plugs and the corresponding cavity bottom surfaces, and the outer wall of the release tube shell is provided with an annular groove at the position corresponding to the annular plug, and an annular capsule is embedded in the annular groove, and the groove bottom of the annular groove is provided with a position corresponding to the annular plug that can be engaged with the axial hollow The release tube shell is provided with a first through hole connected to the cavity, the inner wall of the release tube shell is provided with a second through hole at a position corresponding to the two annular plugs, and the center tube is provided with a third through hole corresponding to the second through hole; the tube wall of the release tube shell is evenly provided with a plurality of first radial holes at a position close to the axial hollow cavity, the center tube is provided with a second radial hole corresponding to the first radial hole, the center tube is threadedly connected with a one-way valve in the pipe section where the second radial hole is located, the inlet of the one-way valve is connected to a conduit, the outer peripheral wall of the one-way valve is provided with a third radial hole connected to the second radial hole, and the shell of the one-way valve is provided with an axial hole connected to the center tube.

2. The continuous chemical water plugging and acidizing packer according to claim 1 is characterized by: Axial guide rods are fixed to the opposite back surfaces of the two annular stoppers respectively, and the bottom surface of the axial hollow cavity of the release tube shell is provided with guide holes matched with the axial guide rods.

3. The continuous chemical water plugging and acidizing packer according to claim 1 is characterized by: The clamping structure includes a clamping sleeve wrapped around the outside of the reduced diameter section and an annular drive disk fixed to the outer side wall of the front port of the center tube. The front part of the clamping sleeve is a two-petal structure, and its inner wall is provided with a conical contact surface that cooperates with the outer ring surface of the annular drive disk. The front outer wall of the clamping sleeve is provided with a tooth-shaped structure.

4. The continuous chemical water plugging and acidizing packer according to claim 1 is characterized by: The number of the first through holes in each annular groove is multiple and evenly distributed around the annular stopper.

5. The continuous chemical water plugging and acidizing packer according to claim 1 is characterized by: The number of the second through holes and the number of the third through holes are respectively plural and equal.

6. The continuous chemical water plugging and acidizing packer according to claim 1 is characterized by: The number of the first radial holes, the second radial holes and the third radial holes is plural and equal.

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