Injection and prevention integrated packing device for horizontal well

Abstract

The invention discloses a horizontal well injection and prevention integrated packing device, and relates to the technical field of oil field oil extraction technology downhole tools. An upper connector of the device is arranged on the upper portion of the device and sequentially provided with a hydraulic part, a locking part, a high-temperature-resistant sealing part, a slip anchoring part, a filling part, a closing part, a sealing seat part, a steam injection part and a sand supplementing part from top to bottom, and a lower connector is arranged on the lower portion of the device. The method is suitable for heavy oil thermal recovery of the horizontal section of the horizontal well, and after filling operation is completed, steam injection operation can be carried out without descending a steam injection packer; the stratum can be effectively blocked, and during inverse well flushing, well flushing fluid cannot flow into the stratum to cause cold damage to the stratum; when rotary pumping operation is carried out after flowing oil extraction, if the stratum is empty again and gravel needs to be filled for sand prevention operation, the sand supplementing insertion pipe is inserted, and sand supplementing operation can be carried out; the sealing effect is good, and steam injection loss is reduced; energy is saved, operation well occupation time is shortened by 6-8 days, the oil well production time rate is increased, and the oil extraction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools for oilfield production processes, in particular to an injection-prevention integrated isolation device for a horizontal well. Background Art

[0002] Heavy oil (also called heavy oil) is an important component of petroleum hydrocarbon energy, with a huge potential several times higher than conventional crude oil resources. In order to increase oil production, heavy oil and super-heavy oil wells are often equipped with horizontal well sections, which have low formation pressure, poor flow performance, high viscosity and high density of heavy oil, low displacement efficiency and low oil sweeping volume efficiency, resulting in insufficient wellbore fluid supply, difficulty in pumping, and a sharp drop in single well production.

[0003] Steam huff and puff technology for heavy oil production is widely used. The existing heavy oil steam production well technology has the following shortcomings and deficiencies: First, after steam is injected, the well needs to be sealed for 3 to 9 days before operations can be started, resulting in a long well occupancy period and low well opening efficiency; second, brine is needed to pressurize the well during operations, which causes cold damage to thermal wells and blocks the near-well formation channels with cold oil; third, during production, sand control tools are first lowered to prevent sand, and after sand control is completed, steam seals are lowered to inject steam, and the process is relatively cumbersome; fourth, when the transfer pumping operation is carried out after self-flowing oil production, it is impossible to fill the formation deficit with sand again; fifth, the sealing performance is poor and the heat energy loss is large. Summary of the invention

[0004] The purpose of the present invention is to provide a horizontal well injection and prevention integrated isolation device in view of the above-mentioned deficiencies.

[0005] The objective of the present invention is achieved by the following technical solutions: The present invention comprises: an upper joint and a lower joint; the upper joint is arranged on the upper part of a horizontal well injection and prevention integrated isolation device, and is provided with a hydraulic part, a locking part, a high temperature resistant sealing part, a slip anchoring part, a filling part, a closing part, a sealing seat part, a steam injection part and a sand replenishing part in sequence from top to bottom, and a lower joint is provided at the bottom.

[0006] Furthermore, the hydraulic part includes a sealing ring, a sealing seat is provided at the lower part of the sealing ring, an upper joint is provided at the upper part of the sealing ring, an inner center pipe upper short circuit is provided in the center hole of the sealing ring, and the lower part of the sealing seat is threadedly connected to the disconnecting body.

[0007] Furthermore, the locking part includes a retaining spring, which is sleeved on the outer central tube. A disconnecting body is provided on the upper part of the outer central tube. A copper shear nail is provided between the disconnecting body and the short circuit on the central tube. The lower part of the disconnecting body is connected to the high temperature resistant seal.

[0008] Furthermore, the high temperature resistant sealing part includes a high temperature resistant sealing member, a pressure seat is provided on the upper part of the high temperature resistant sealing member, a sealing copper pad is provided on the upper part of the pressure seat, a sealing seat is provided on the lower part, and the lower part of the sealing seat is connected to the upper cone.

[0009] Furthermore, the slip anchoring part includes an upper cone, a slip tube, a slip, and a lower cone are sequentially arranged at the lower part of the upper cone, a spring sheet is arranged in the slip groove, and an outer sleeve is arranged on the outside of the lower cone, and the lower part of the outer sleeve is threadedly connected to the inner sleeve.

[0010] Furthermore, the filling part includes an inner center tube, the lower part of the inner center tube is connected to the inner sleeve through an external thread, and the lower part of the inner center tube is connected to the upper part of the ball seat I through an internal thread of the center hole.

[0011] Furthermore, a positioning pin is provided between the inner center tube and the ball seat I.

[0012] Furthermore, the closing part includes a floating body, at the lower part of which a spring V is provided, the spring V sitting on a spring seat III, the upper part of the spring seat III being threadedly connected to the connecting sleeve, the lower external thread of the spring seat III being threadedly connected to the upper part of the lower joint, and the lower internal threaded hole of the spring seat III being threadedly connected to the upper part of the ball seat II.

[0013] Furthermore, the sealing seat part includes a ball seat I, a steel ball I is provided on the upper part of the ball seat I, a spring I is provided on the upper part of the steel ball I, a spring seat I is provided on the upper part of the spring I, a ball seat II is connected to the lower part of the ball seat I, a steel ball II is provided on the upper part of the ball seat II, a spring II is provided on the upper part of the steel ball II, a connecting sleeve II is provided on the upper part of the spring II, and a lower joint is provided on the outside of the ball seat II.

[0014] Furthermore, the steam injection part includes a coupling, a threaded steam injection pipe is provided at the lower part of the coupling, a spring claw structure is provided at the front end of the steam injection pipe, and a steel sleeve, a copper sleeve and a hot-embedded brass high-temperature resistant sealing sleeve are provided on the outside of the steam injection pipe from top to bottom.

[0015] Furthermore, the sand replenishing part is provided with a load-bearing seat on the upper part of the sand replenishing center tube, a straightening body is provided on the upper part of the load-bearing seat, a straightening block is provided in the middle part of the straightening body, a straightening spring is provided between the straightening block and the straightening body, the lower part of the straightening block is embedded in the load-bearing seat, the upper part of the straightening block is fitted with the outer circle of the straightening body through a limiting sleeve, the lower part of the center tube is threadedly connected with the ball seat III, the ball seat III is provided with a steel ball III, the lower part of the ball seat III is threadedly connected with the ball seat IV, and the ball seat IV is provided with a steel ball IV.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention is suitable for thermal recovery of heavy oil in the horizontal section of a horizontal well. After the filling operation is completed, there is no need to inject a steam packer, and steam injection operation can be carried out directly. The formation can be effectively sealed, and when the well is backwashed, the well washing fluid will not flow into the formation to cause cold damage to the formation. When the pumping operation is carried out after the self-flowing oil production, if the formation is depleted again, it is necessary to further fill gravel for sand prevention operation, and the sand replenishment operation can be carried out directly by inserting a sand replenishment cannula. The sealing effect is good, and the steam injection loss is reduced. Energy is saved, the well occupation time is reduced by 6 to 8 days, the production time rate of the oil well is improved, and the oil production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 - A schematic diagram of the full cross-section structure of the present invention from the front view.

[0018] Figure 2 - A schematic diagram of the full cross-section structure of the steam injection part of the present invention.

[0019] Figure 3 - Schematic diagram of the full cross-section structure of the sand filling part of the present invention.

[0020] Figure 4 -Schematic diagram of the field application structure of the present invention.

[0021] In the attached figure, 0. upper joint, 1. sealing ring, 2. sealing seat, 3. short-circuit on inner center tube, 4. disconnect body, 5. Pressure seat, 6. Circlip, 7. Outer center tube, 8. Sealing seat, 9. Upper cone, 10. Slip tube, 11. Bow spring sheet, 12. Outer jacket, 13. Spring seat I, 14. Floating body, 15. Positioning pin, 16. Connecting sleeve, 17. Spring seat II, 18. Lower joint, 19. Ball seat II, 20. Pressure seat, 21. High temperature resistant seal, 22. Pressure seat wire ring, 23. Inner center tube, 24. Slip, 25. Lower cone, 26. Inner sleeve, 27. Spring I, 28. Spring V, 29. Ball seat I, 30. Spring seat III, 31. Spring II, 32. Steel ball II, 33. Positioning key, 34. Copper shear nail, 35. Copper sealing pad, 36. Steel ball I, 3 7. Coupling, 38. Steel sleeve, 39. Copper sleeve, 40. High temperature resistant sealing sleeve, 41. Steam injection plug, 42. Straightening body, 43. Limiting sleeve, 44. Straightening block, 45. Straightening spring, 46. Bearing seat, 47. Sand replenishment center pipe, 48. Steel ball III, 49. Ball seat III, 50. Steel ball IV, 51. Ball seat IV, 52. Wellbore, 53. Tube, 54. Insulation pipe, 55. Compensator, 56. Well washing check valve, 57. Oil drain valve, 58. Thermosensitive packer, 59. Horizontal well injection and prevention integrated packing device, 60. Sealing joint, 61. Wire wrapped sand control pipe, 62. Oil layer, 63. Wire plug, 64. Artificial well bottom, 65. Sand control upper limit, 66. Sand control lower limit. DETAILED DESCRIPTION

[0022] The present invention is further described with reference to the accompanying drawings: like Figure 1-3 As shown, a horizontal well injection and protection integrated isolation device comprises: an upper joint 0 and a lower joint 18; the upper joint 0 is arranged at the upper part of the horizontal well injection and protection integrated isolation device, and is provided with a hydraulic part, a locking part, a high temperature resistant sealing part, a slip anchoring part, a filling part, a closing part, a sealing seat part, a steam injection part and a sand replenishing part from top to bottom, and the lower part is provided with a lower joint 18.

[0023] Specifically, the hydraulic part includes a sealing ring 1, a sealing seat 2 is provided at the lower part of the sealing ring 1, an upper joint 0 is provided at the upper part of the sealing ring 1, an inner center tube upper short circuit 3 is provided in the center hole of the sealing ring 1, and the lower part of the sealing seat 2 is threadedly connected to the disconnecting body 4.

[0024] Specifically, the locking part includes a retaining spring 6, which is sleeved on the outer center tube 7. A disconnecting body 4 is provided on the upper part of the outer center tube 7. A copper shear nail 34 is provided between the disconnecting body 4 and the short circuit 3 on the center tube. The lower part of the disconnecting body 4 is connected to the high temperature resistant seal 21.

[0025] Specifically, the high temperature resistant sealing part includes a high temperature resistant sealing member 21 , a pressure seat 5 is provided on the upper part of the high temperature resistant sealing member 21 , a sealing copper pad 35 is provided on the upper part of the pressure seat 5 , a sealing seat 8 is provided on the lower part, and the lower part of the sealing seat 8 is connected to the upper cone 9 .

[0026] Specifically, the slip anchoring part includes an upper cone 9, at the lower part of which a slip tube 10, a slip 24 and a lower cone 25 are arranged in sequence, in the slip groove a spring sheet 11 is arranged, and on the outside of the lower cone 25 an outer sleeve 12 is arranged, and the lower part of the outer sleeve 12 is threadedly connected to the inner sleeve 26.

[0027] Specifically, the filling part includes an inner center tube 23, the lower part of the inner center tube 23 is connected to the inner sleeve 26 through an external thread, and the lower part of the inner center tube 23 is connected to the upper part of the ball seat I 29 through an internal thread of the center hole.

[0028] Specifically, a positioning pin 15 is provided between the inner center tube 23 and the ball seat Ⅰ29.

[0029] Specifically, the closing part includes a floating body 14, at the lower part of which a spring V28 is provided, and the spring V28 sits on a spring seat III30, the upper part of the spring seat III30 is threadedly connected to the connecting sleeve 16, the lower external thread of the spring seat III30 is threadedly connected to the upper part of the lower joint 18, and the lower internal threaded hole of the spring seat III30 is threadedly connected to the upper part of the ball seat II19.

[0030] Specifically, the sealing seat part includes a ball seat Ⅰ29, a steel ball Ⅰ36 is provided on the upper part of the ball seat Ⅰ29, a spring Ⅰ27 is provided on the upper part of the steel ball Ⅰ36, a spring seat Ⅰ13 is provided on the upper part of the spring Ⅰ27, a ball seat Ⅱ19 is connected to the lower part of the ball seat Ⅰ29, a steel ball Ⅱ32 is provided on the upper part of the ball seat Ⅱ19, a spring Ⅱ31 is provided on the upper part of the steel ball Ⅱ32, a spring seat Ⅱ is provided on the upper part of the spring Ⅱ31, and a lower joint 18 is provided on the outside of the ball seat Ⅱ19.

[0031] Specifically, the steam injection part includes a coupling 37, a threaded steam injection pipe 41 is provided at the lower part of the coupling 37, a spring claw structure is provided at the front end of the steam injection pipe 41, and a steel sleeve 38, a copper sleeve 39 and a heat-embedded brass high-temperature resistant sealing sleeve 40 are provided on the outside of the steam injection pipe 41 from top to bottom.

[0032] Specifically, the sand replenishing part is provided with a load-bearing seat 46 on the upper part of the sand replenishing center tube 47, a straightening body 42 is provided on the upper part of the load-bearing seat 46, a straightening block 44 is provided in the middle part of the straightening body 42, a straightening spring 45 is provided between the straightening block 44 and the straightening body 42, the lower part of the straightening block 44 is embedded in the load-bearing seat 46, the upper part of the straightening block 44 is fitted with the outer circle of the straightening body 42 through a limiting sleeve 43, the lower part of the sand replenishing center tube 47 is threadedly connected with the ball seat III 49, the ball seat III 49 is provided with a steel ball III 48, the lower part of the ball seat III 49 is threadedly connected with the ball seat IV 51, and the ball seat IV 51 is provided with a steel ball IV 50. Embodiment 1

[0033] A method for using a horizontal well injection and prevention integrated isolation device: First, the production tubing string is connected from bottom to top as follows: thread plug 63 + sand control pipe 61 + sealing joint 60 + horizontal well injection and prevention integrated isolation device 59 + thermal sensitive packer 58 + oil drain valve 57 + well washing check valve 56 + compensator 55 + insulation pipe 54 + tubing string 53.

[0034] Secondly, a horizontal well injection and prevention integrated isolation device 59 is lowered to the designed position of the horizontal section of the oil well.

[0035] Third, a high-pressure pump truck is used to pressurize and inject water into a horizontal well injection and prevention integrated isolation device 29 to cut the copper shear nails 34, the upper cone 9 expands the slip 24, and the pressure seat 20 compresses the high-temperature resistant seal 21, causing the high-temperature resistant seal 21 to expand, thereby achieving seat sealing.

[0036] Fourth, continue to pressurize to 20MPa, cut off the lower positioning pin 15, and the ball seat I 29 moves down quickly, the filling channel is opened, and the gravel filling operation can be carried out. Fourth, after the gravel filling is completed, the filling channel is used for backwashing operations, and then the pipe column 53 is lifted up for 20-25 turns to release the hand, and the filling channel is automatically closed. Then connect the steam injection plug 41 to carry out steam injection operations.

[0037] Fifth, a spring claw structure is provided at the front end of the steam injection plug 41. The spring claw is compressed during the insertion into the sealing seat 8. When the steam injection plug 41 is fully inserted into the sealing seat 8, the spring claw expands and is stuck in the retaining ring groove in the sealing seat 8. The steam injection plug 41 is relatively fixed to the sealing seat 8. A heat-inserted brass high-temperature resistant sealing sleeve 40 is provided on the periphery of the steam injection plug 41 to achieve the double sealing effect of metal sealing and high-temperature resistant sealing between the steam injection plug 41 and the sealing seat 8. After the steam injection is completed, the steam injection plug 41 is lifted up. When the tension of the steam injection plug 41 reaches 90-100KN, the spring claw of the steam injection plug 41 contracts and exits the retaining ring groove, and the steam injection plug 41 is lifted out of the sealing seat 8.

[0038] Sixth, when the pumping operation is carried out after the oil production operation, if the formation is depleted again and further gravel filling is required for sand prevention operation, the sand replenishment center pipe 47 only needs to be inserted again into the horizontal well injection and prevention integrated isolation device 59 left in the well, and the secondary gravel filling operation can be carried out. Since the lower part of the horizontal well injection and prevention integrated isolation device has a positioning pin 15, and the lower part of the sand replenishment center pipe 47 is provided with a positioning track groove, when the sand replenishment center pipe 47 is inserted into the horizontal well injection and prevention integrated isolation device 59, the positioning pin 15 automatically slides into the track groove, and the opening of the sand replenishment center pipe 47 is just aligned with the gravel filling port on the horizontal well injection and prevention integrated isolation device 59, and the floating body 14 is pushed downward, so that the filling channel is opened again, and the secondary sand replenishment filling operation is carried out. Embodiment 2

[0039] The design plan for the GDN29P302 well of the Gudao Oilfield is as follows: after the overhaul in March 2023, the wire-wound sand control pipe 61 and the thermal insulation pipe 54 were lowered for closed steam injection with a steam injection pressure of 15MPa, successfully completing the gravel filling, steam injection and sand replenishment tasks.

Claims

1. A horizontal well injection and prevention integrated isolation device, comprising: An upper joint (0) and a lower joint 18; characterized in that the upper joint (0) is arranged at the upper part of a horizontal well injection and prevention integrated isolation device, and is provided with a hydraulic part, a locking part, a high temperature resistant sealing part, a slip anchoring part, a filling part, a closing part, a sealing seat part, a steam injection part and a sand replenishing part in sequence from top to bottom, and a lower joint is provided at the lower part.

2. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The hydraulic part comprises a sealing ring (1), a sealing seat (2) is provided at the lower part of the sealing ring (1), an upper joint (0) is provided at the upper part of the sealing ring (1), an inner center pipe upper short-circuit (3) is provided in the center hole of the sealing ring (1), and the lower part of the sealing seat (2) is threadedly connected to the disconnecting body (4).

3. The horizontal well injection and prevention integrated isolation device according to claim 1 is characterized in that: The locking part comprises a retaining spring (6), which is sleeved on the outer central tube (7). A disconnecting body (4) is provided on the upper part of the outer central tube (7). A copper shear nail (34) is provided between the disconnecting body (4) and the short-circuit (3) on the central tube. The lower part of the disconnecting body (4) is connected to a high temperature resistant sealing member (21).

4. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The high temperature resistant sealing part comprises a high temperature resistant sealing member (21), a pressure seat (5) is provided on the upper part of the high temperature resistant sealing member (21), a sealing copper pad (35) is provided on the upper part of the pressure seat (5), and a sealing seat (8) is provided on the lower part, and the lower part of the sealing seat (8) is connected to the upper cone (9).

5. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The slip anchoring part comprises an upper cone (9), a slip tube (10), a slip (24), and a lower cone (25) are sequentially arranged at the lower part of the upper cone (9), a spring sheet (11) is arranged in the slip groove, and an outer sleeve (12) is arranged outside the lower cone (25), and the lower part of the outer sleeve (12) is threadedly connected to the inner sleeve (26).

6. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The filling part comprises an inner center tube (23), the lower part of the inner center tube (23) is connected to the inner sleeve (26) via an external thread, and the lower part of the inner center tube (23) is connected to the upper part of the ball seat I (29) via an internal thread of the center hole.

7. The horizontal well injection and prevention integrated isolation device according to claim 6 is characterized by: A positioning pin (15) is provided between the inner center tube (23) and the ball seat I (29).

8. The horizontal well injection and prevention integrated isolation device according to claim 1 is characterized in that: The closing part comprises a floating body (14), a spring V (28) is arranged at the lower part of the floating body (14), the spring V (28) sits on a spring seat III (30), the upper part of the spring seat III (30) is threadedly connected to the connecting sleeve (16), the lower external thread of the spring seat III (30) is threadedly connected to the upper part of the lower joint (18), and the lower internal thread hole of the spring seat III (30) is threadedly connected to the upper part of the ball seat II (19).

9. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The sealing seat portion comprises a ball seat I (29), a steel ball I (36) is arranged on the upper part of the ball seat I (29), a spring I (27) is arranged on the upper part of the steel ball I (36), a spring seat I (13) is arranged on the upper part of the spring I (27), a ball seat II (19) is connected to the lower part of the ball seat I (29), a steel ball II (32) is arranged on the upper part of the ball seat II (19), a spring II (31) is arranged on the upper part of the steel ball II (32), a spring seat II (17) is arranged on the upper part of the spring II (31), and a lower joint (18) is arranged on the outside of the ball seat II (19).

10. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The steam injection part comprises a coupling (37), a threaded steam injection insert (41) is provided at the lower part of the coupling (37), a spring claw structure is provided at the front end of the steam injection insert (41), and a steel sleeve (38), a copper sleeve (39) and a heat-inserted brass high-temperature resistant sealing sleeve (40) are provided in sequence from top to bottom on the outside of the steam injection insert (41).

11. The horizontal well injection and prevention integrated isolation device according to claim 1, characterized in that: The sand replenishing part comprises a bearing seat (46) at the upper part of the sand replenishing central tube (47), a straightening body (42) at the upper part of the bearing seat (46), a straightening block (44) at the middle part of the straightening body (42), a straightening spring (45) between the straightening block (44) and the straightening body (42), the lower part of the straightening block (44) is embedded in the bearing seat (46), the upper part of the straightening block (44) is fitted with the outer circle of the straightening body (42) through a limiting sleeve (43), the lower part of the central tube (47) is threadedly connected to a ball seat III (49), a steel ball III (48) is arranged on the ball seat III (49), the lower part of the ball seat III (49) is threadedly connected to a ball seat IV (51), and a steel ball IV (50) is arranged on the ball seat IV (51).

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