Packer provided with sealing circulation sliding sleeve and suitable for one-trip half-way well cementation

Abstract

The invention relates to the technical field of oil and gas well cementation, and discloses a packer provided with a sealing circulation sliding sleeve and suitable for one-trip type half-stroke well cementation, the packer comprises a setting cylinder assembly, and a lifting tool pipe assembly is arranged in the setting cylinder assembly in a penetrating mode; the lifting tool pipe assembly comprises a pushing unit located at the upper end and an elastic clamping jaw unit located at the lower end, the setting cylinder assembly comprises a setting cylinder, an extrusion setting hanging unit is arranged on the outer wall of the upper end of the setting cylinder, and a circulating sliding sleeve unit is arranged on the outer wall of the lower end of the setting cylinder. The pushing unit is arranged in the extruding, setting and hanging unit in a penetrating mode so that the extruding, setting and hanging unit can conduct setting and hanging through expansion, and the elastic clamping jaw unit can be elastically clamped into the circulating sliding sleeve unit so that the circulating sliding sleeve unit can open or close a circulating channel through sliding. According to the packer with the sealing circulation sliding sleeve, different special service tools do not need to be replaced in the whole construction process, the equipment cost is reduced, and the construction difficulty is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well cementing, and in particular to a packer with a sealing circulation sliding sleeve suitable for one-trip half-stroke cementing. Background Art

[0002] The one-trip, half-pass cementing process involves installing a special cementing tool, a staged cementing sleeve, at a predetermined location within the wellbore casing string. During cementing, a special process is used to separately cement the annular spaces of the casing above and below the staged cementing sleeve. However, to increase oil recovery, the wellbore requires various operations, including setting and hanging the wellbore, well cleaning, fracturing, and acidizing. This requires multiple manipulations within the casing string, and even multiple changes of specialized service tools to complete these steps. This results in high equipment costs and significantly increases the difficulty of the process. Summary of the Invention

[0003] In order to overcome the defects of the prior art, the present invention provides a packer with a sealed circulation sliding sleeve suitable for one-trip half-stroke cementing to solve the problems in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a sealer with a sealed circulation sleeve suitable for one-trip half-stroke cementing, including a sealing barrel assembly, a lifting tool tube assembly is passed through the sealing barrel assembly, and the lifting tool tube assembly includes a pushing unit at the upper end and an elastic claw unit at the lower end. The sealing barrel assembly includes a sealing barrel, and the upper end outer wall of the sealing barrel is provided with an extrusion sealing and hanging unit, and the lower end outer wall of the sealing barrel is provided with a circulation sleeve unit. The pushing unit is passed through the extrusion sealing and hanging unit so that the extrusion sealing and hanging unit can be sealed and hung by expansion, and the elastic claw unit can be elastically stuck in the circulation sleeve unit so that the circulation sleeve unit can open or close the circulation channel by sliding.

[0005] The beneficial effect of the present invention is that after the extrusion sealing and hanging unit on the sealing tube assembly is pushed by the pushing unit, the extrusion sealing and hanging unit is expanded, so that the outer wall of the sealing tube assembly blocks the wellbore wall, and the sealing tube assembly completes the seating operation. After the sealing and hanging is completed, the pulling tool tube assembly is further lowered, so that the elastic claw unit is stuck in the circulation sleeve unit. After further lowering again, the elastic claw unit drives the circulation sleeve unit to move, so that the inside of the sealing tube assembly and the wellbore are connected, so as to facilitate pickling, cementing and other construction. When the pulling tool tube assembly is extracted, the elastic claw unit can drive the circulation sleeve unit to close the circulation channel. The entire construction process does not require the replacement of different special service tools, thereby reducing equipment costs and greatly reducing construction difficulty.

[0006] Furthermore, the pushing unit includes a lifting tube, the upper outer wall of the lifting tube is sleeved with a sealing piston, the lower end of the sealing piston is provided with a sealing joint sleeved on the lifting tube, and a first pressurized hole is opened on the inner wall of the lifting tube close to the sealing piston. The extrusion sealing and hanging unit is sleeved on the sealing joint, so that the sealing piston pushes the extrusion sealing and hanging unit to perform sealing and hanging through expansion.

[0007] After adopting the above-mentioned further structure, the first pressure hole is pressurized to move the setting piston, thereby pushing the setting joint, so that the setting joint drives the extrusion setting hanging unit, thereby expanding the extrusion setting hanging unit, and the construction difficulty is relatively lower.

[0008] Furthermore, the extrusion setting and hanging unit includes a setting push cylinder, one end of the setting push cylinder is sleeved on the setting joint, the other end of the setting push cylinder is connected to a connecting sleeve, the end of the connecting sleeve away from the setting push cylinder is provided with a sealing ring, the end of the sealing ring away from the connecting sleeve is provided with a slidable upper conical sleeve, the end of the upper conical sleeve away from the sealing ring is provided with a drill tool slip, and the end of the drill tool slip away from the upper conical sleeve is fixedly provided with a lower conical sleeve.

[0009] After adopting the above-mentioned further structure, during the movement of the setting joint, the setting push cylinder is driven, and the setting push cylinder is squeezed toward the connecting sleeve, and the connecting sleeve squeezes the sealing ring, so that the outer diameter of the sealing ring expands, thereby making the outer diameter of the sealing ring seal the wellbore wall, thereby completing the setting. At the same time, since the sealing ring is squeezed, the sealing ring also pushes the upper conical sleeve to move, so that the drill tool slips continue to bulge with the movement of the upper conical sleeve until they are tightly pressed and hung on the wellbore wall, thereby completing the setting.

[0010] Furthermore, a pressurized release unit is provided in the connecting sleeve and is sleeved on the pulling tube. A connecting sleeve is installed on the lower end of the pulling tube. The pressurized release unit is located on the outer wall of one end of the pulling tube close to the connecting sleeve, so that the pulling tube can be pulled out from the connecting sleeve.

[0011] With the above-mentioned further structure, after the construction is completed, the removal operation of the pulling tube can be facilitated.

[0012] Furthermore, the elastic claw unit is installed at the lower end of the connecting sleeve, and the pressurized release unit includes a fixed sleeve that is clamped in the setting push cylinder, and a release piston is provided in the fixed sleeve. The release piston is connected to the fixed sleeve by a pin, and a second pressurized hole is opened on the fixed sleeve, and the second pressurized hole corresponds to the release piston. The release piston is sleeved on the pulling tube.

[0013] After adopting the above-mentioned further structure, the second pressure hole is pressurized and pressurized to move the release piston. Since the fixed sleeve is fixed, the pin is cut off, so that the release piston and the fixed sleeve are separated, so that the pulling tube can be pulled out from the connecting sleeve, and the release piston can be pulled out together.

[0014] Furthermore, the circulation sleeve unit includes a circulation section located at the lower end of the sealing cylinder, a lower joint is provided at the lower end of the circulation section, a circulation outlet is provided on the outer wall of the circulation section, a slidable sleeve is provided on the inner wall of the circulation section, a circulation inlet is provided on the sleeve, the circulation inlet and the circulation outlet form a circulation channel, a card cavity is provided on the inner wall of the sleeve, and the elastic claw unit is located in the card cavity.

[0015] After adopting the above-mentioned further structure, when it is necessary to establish a circulation channel, as the elastic claw unit is located in the card cavity, when it is further lowered, the elastic claw unit drives the sliding sleeve to move downward, so that the circulation inlet is connected to the circulation outlet, thereby forming a circulation channel, which is convenient for construction operations such as pickling or well washing. When the pulling pipe is pulled out, the elastic claw unit will also move upward, so that the sliding sleeve is reset, thereby closing the circulation channel, so that cement backflow after cementing.

[0016] Furthermore, the elastic claw unit includes a claw seat installed on the outer wall of the lower end of the connecting sleeve, and a groove is provided on the outer wall of the claw seat. A claw corresponding to the clamping cavity is clamped in the groove, and the claw and the groove are connected by a spring.

[0017] With the above further structure, when the claw is lowered, until the claw reaches the position of the groove, the claw is clamped into the clamping cavity under the action of the spring, thereby facilitating the movement of the sliding sleeve.

[0018] Furthermore, the inner upper end of the card cavity is provided with a first inclined wall, the inner lower end of the card cavity is provided with a right-angle wall, the upper side surface of the clamping claw is provided with a second inclined wall, and the surface of the clamping claw facing the circulation section is provided with a corrugated section.

[0019] With the above-mentioned further structure, the clamping claw can be easily separated from the clamping cavity, and at the same time, the clamping claw can be prevented from being completely separated from the clamping cavity during the lowering process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection structure of the setting cylinder assembly and the pulling tool pipe assembly of the present invention.

[0021] Figure 2 This is one of the partial structural schematic diagrams of the setting cylinder assembly and the pulling tool tube assembly of the present invention.

[0022] Figure 3This is the second partial structural schematic diagram of the setting cylinder assembly and the pulling tool tube assembly of the present invention.

[0023] Figure 4 It is a schematic diagram of the connection structure of the drill slips of the present invention.

[0024] Figure 5 Schematic diagram of the structure of the pulling tool tube assembly.

[0025] Figure 6 It is a structural schematic diagram of the pressurized release unit of the present invention.

[0026] In the figure: the setting cylinder assembly 1, the pulling tool tube assembly 2, the setting push cylinder 3, the connecting sleeve 4, the sealing ring 5, the upper conical sleeve 6, the drill slip 7, the lower conical sleeve 8, the sliding sleeve 9, the circulation section 10, the lower joint 11, the circulation inlet 12, the circulation outlet 13, the clamping cavity 14, the connecting sleeve 15, the setting piston 16, the setting joint 17, the pulling tube 18, the release piston 19, the claw seat 20, the groove 21, the claw 22, the second inclined wall 23, the spring 24, the fixing sleeve 25, the second pressurized hole 26, the pin 27, and the first pressurized hole 28. DETAILED DESCRIPTION

[0027] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0028] Combine Figures 1 to 6The seal shown is a seal with a sealed circulation sleeve suitable for one-trip half-way cementing, including a sealing cylinder assembly 1, a lifting tool pipe assembly 2 is inserted into the sealing cylinder assembly 1, and the lifting tool pipe assembly 2 includes a pushing unit at the upper end and an elastic claw unit at the lower end. The sealing cylinder assembly 1 includes a sealing cylinder, an extrusion sealing hanging unit is provided on the upper outer wall of the sealing cylinder, and a circulation sleeve unit is provided on the lower outer wall of the sealing cylinder. The pushing unit is inserted into the extrusion sealing hanging unit so that the extrusion sealing hanging unit can be sealed by expansion, and the elastic claw unit can be elastically stuck in the circulation sleeve unit so that the circulation sleeve unit can open or close the circulation channel by sliding; the extrusion sealing hanging unit on the sealing cylinder assembly 1 of this embodiment After the element is pushed by the pushing unit, the extrusion sealing and hanging unit is expanded, so that the outer wall of the sealing tube assembly 1 blocks the wellbore wall, and the sealing tube assembly 1 completes the seating operation. After the sealing and hanging is completed, the pulling tool pipe assembly 2 is further lowered, so that the elastic claw unit is stuck in the circulation sleeve unit. After being lowered further, the elastic claw unit drives the circulation sleeve unit to move, so that the interior of the sealing tube assembly 1 and the wellbore are connected, so as to facilitate pickling, cementing and other construction. When the pulling tool pipe assembly 2 is extracted, the elastic claw unit can drive the circulation sleeve unit to close the circulation channel. The entire construction process does not require the replacement of different special service tools, which reduces equipment costs and greatly reduces construction difficulty.

[0029] The pushing unit of this embodiment includes a lifting tube 18, the upper outer wall of the lifting tube 18 is sleeved with a sealing piston 16, and the lower end of the sealing piston 16 is provided with a sealing joint 17 sleeved on the lifting tube 18, and a first pressurizing hole 28 is opened on the inner wall of the lifting tube 18 on the side close to the sealing piston 16, and the extrusion setting and hanging unit is sleeved on the sealing joint 17, so that the sealing piston 16 pushes the extrusion setting and hanging unit to be set and hung through expansion; by pressurizing the first pressurizing hole 28, the setting piston 16 is moved, thereby pushing the sealing joint 17, so that the sealing joint 17 drives the extrusion setting and hanging unit, thereby causing the extrusion setting and hanging unit to expand, and the construction difficulty is relatively lower.

[0030] Specifically, the extrusion setting unit includes a setting push cylinder 3, one end of the setting push cylinder 3 is sleeved on the setting joint 17, the other end of the setting push cylinder 3 is connected to a connecting sleeve 4, the end of the connecting sleeve 4 away from the setting push cylinder 3 is provided with a sealing ring 5, the end of the sealing ring 5 away from the connecting sleeve 4 is provided with a slidable upper conical sleeve 6, the end of the upper conical sleeve 6 away from the sealing ring 5 is provided with a drill slip 7, and the end of the drill slip 7 away from the upper conical sleeve 6 is fixedly provided with a lower conical sleeve 8; during the movement of the setting joint 17 , driving the setting seal push cylinder 3, the setting seal push cylinder 3 is squeezed toward the connecting sleeve 4, and the connecting sleeve 4 squeezes the sealing collar 5, so that the outer diameter of the sealing collar 5 expands, thereby making the outer diameter of the sealing collar 5 seal the wellbore wall, thereby completing the setting. At the same time, since the sealing collar 5 is squeezed, the sealing collar 5 also pushes the upper conical sleeve 6 to move. The side of the upper conical sleeve 6 facing the drill slip 7 is inclined, so that the drill slip 7 continues to bulge with the movement of the upper conical sleeve 6 until it is tightly pressed and hung on the wellbore wall, thereby completing the setting.

[0031] It is worth noting that if Figure 5 As shown, the connecting sleeve 4 of this embodiment is provided with a pressurized release unit which is sleeved on the pulling tube 18, and the lower end of the pulling tube 18 is plugged and installed with a connecting sleeve 15. The pressurized release unit is located on the outer wall of one end of the pulling tube 18 close to the connecting sleeve 15, so that the pulling tube 18 can be pulled away from the connecting sleeve 15; after the construction is completed, the lifting tube 18 can be easily removed.

[0032] Specifically, the elastic claw unit is installed at the lower end of the connecting sleeve 15, and the pressurized release unit includes a fixed sleeve 25 clamped in the setting push cylinder 3, and a release piston 19 is provided in the fixed sleeve 25. The release piston 19 is connected to the fixed sleeve by a pin 27. A second pressurizing hole 26 is opened on the fixed sleeve 25, and the second pressurizing hole 26 corresponds to the release piston 19. The release piston 19 is sleeved on the pulling tube 18; by pressurizing the second pressurizing hole 26, the release piston 19 moves. Since the fixed sleeve 25 is fixed, the pin 27 is cut off, so that the release piston 19 and the fixed sleeve 25 are separated, so that the pulling tube 18 can be pulled out from the connecting sleeve 15, and the release piston 19 can be pulled out together.

[0033] The circulation sleeve unit of this embodiment includes a circulation section 10 located at the lower end of the sealing cylinder, and a lower joint 11 is provided at the lower end of the circulation section 10. A circulation outlet 13 is provided on the outer wall of the circulation section 10, and a slidable sleeve 9 is provided on the inner wall of the circulation section 11. A circulation inlet 12 is provided on the sleeve 9. The circulation inlet 12 and the circulation outlet 13 form a circulation channel, and a card cavity 14 is provided on the inner wall of the sleeve 9. The elastic claw unit is located in the card cavity 14; when it is necessary to establish a circulation channel, as the elastic claw unit is located in the card cavity 14, when it is further lowered, the elastic claw unit drives the sleeve 9 to move downward, so that the circulation inlet 12 is connected to the circulation outlet 13, thereby forming a circulation channel, so as to facilitate construction operations such as pickling or well washing. When the pulling pipe 18 is pulled out, the elastic claw unit will also move upward, so that the sleeve 9 is reset, thereby closing the circulation channel, so as to facilitate cement backflow after cementing.

[0034] Specifically, the elastic claw unit of this embodiment includes a claw seat 20 installed on the outer wall of the lower end of the connecting sleeve 15, and a groove 21 is provided on the outer wall of the claw seat 20. A claw 22 corresponding to the card cavity 14 is clamped in the groove 21, and the claw 22 and the groove 21 are connected by a spring 24; when the claw 22 is lowered, until the claw 22 reaches the position of the groove 21, under the action of the spring 24, the claw 22 is clamped into the card cavity 14, thereby facilitating the movement of the sliding sleeve 9.

[0035] It is worth noting that, in this embodiment, the inner upper end of the card cavity 14 is provided with a first inclined wall, the inner lower end of the card cavity 14 is provided with a right-angle wall, the upper surface of the claw 22 is provided with a second inclined wall 23, and the surface of the claw 22 facing the circulation section 10 is provided with a corrugated section; after the claw 22 is clamped into the card cavity 14, when the pulling tube 18 is pulled out, the claw 22 will also drive the sliding sleeve 9 to move up a certain stroke until the second inclined wall 23 contacts the first inclined wall. Under the action of the spring, the claw 22 will shrink into the groove 21, and the claw 22 will be separated from the card cavity 14. In another case, when the pulling tube 18 is lowered too far, causing the lower part of the claw 22 to be separated from the card cavity 14, the corrugated section will contact the right-angle wall to prevent the claw 22 from completely separating from the card cavity 14.

[0036] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A packer with a sealing circulation sleeve suitable for one-trip half-stroke cementing, comprising a setting cylinder assembly (1), wherein a pulling tool pipe assembly (2) is inserted into the setting cylinder assembly (1), characterized in that: The pulling tool tube assembly (2) includes a pushing unit at the upper end and an elastic claw unit at the lower end, and the sealing cylinder assembly (1) includes a sealing cylinder, the upper end outer wall of the sealing cylinder is provided with an extrusion sealing hanging unit, and the lower end outer wall of the sealing cylinder is provided with a circulation sleeve unit, the pushing unit is inserted into the extrusion sealing hanging unit so that the extrusion sealing hanging unit can be set by expansion, and the elastic claw unit can be elastically clamped in the circulation sleeve unit so that the circulation sleeve unit can open or close the circulation channel by sliding.

2. A packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 1, characterized in that: The pushing unit includes a lifting tube (18), the upper outer wall of the lifting tube (18) is sleeved with a sealing piston (16), the lower end of the sealing piston (16) is provided with a sealing joint (17) sleeved on the lifting tube (18), and a first pressurizing hole (28) is opened on the inner wall of the lifting tube (18) on the side close to the sealing piston (16), and the extrusion sealing and hanging unit is sleeved on the sealing joint (17) so that the sealing piston (16) pushes the extrusion sealing and hanging unit to perform sealing and hanging through expansion.

3. The packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 2, characterized in that: The extrusion setting and hanging unit comprises a setting push cylinder (3), one end of the setting push cylinder (3) is sleeved on the setting joint (17), the other end of the setting push cylinder (3) is connected to a connecting sleeve (4), the end of the connecting sleeve (4) away from the setting push cylinder (3) is provided with a sealing ring (5), the end of the sealing ring (5) away from the connecting sleeve (4) is provided with a slidable upper conical sleeve (6), the end of the upper conical sleeve (6) away from the sealing ring (5) is provided with a drilling tool slip (7), and the end of the drilling tool slip (7) away from the upper conical sleeve (6) is fixedly provided with a lower conical sleeve (8).

4. A packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 3, characterized in that: The connecting sleeve (4) is provided with a pressurized release unit which is sleeved on the pulling tube (18); the lower end of the pulling tube (18) is plugged with a connecting sleeve (15); the pressurized release unit is located on the outer wall of one end of the pulling tube (18) close to the connecting sleeve (15), so that the pulling tube (18) can be pulled away from the connecting sleeve (15).

5. The packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 4, characterized in that: The elastic claw unit is mounted on the lower end of the connecting sleeve (15); the pressurized release unit comprises a fixed sleeve (25) clamped in the setting push cylinder (3); a release piston (19) is provided in the fixed sleeve (25); the release piston (19) and the fixed sleeve are connected via a pin (27); a second pressurizing hole (26) is provided on the fixed sleeve (25); the second pressurizing hole (26) corresponds to the release piston (19); and the release piston (19) is sleeved on the lifting tube (18).

6. The packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 5, characterized in that: The circulation sleeve unit comprises a circulation section (10) located at the lower end of the setting cylinder, a lower joint (11) is provided at the lower end of the circulation section (10), a circulation outlet (13) is provided on the outer wall of the circulation section (10), a slidable sleeve (9) is provided on the inner wall of the circulation section (11), a circulation inlet (12) is provided on the sleeve (9), the circulation inlet (12) and the circulation outlet (13) form a circulation channel, a clamping cavity (14) is provided on the inner wall of the sleeve (9), and the elastic clamping claw unit is located in the clamping cavity (14).

7. A packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 6, characterized in that: The elastic claw unit comprises a claw seat (20) mounted on the outer wall of the lower end of the connecting sleeve (15), a groove (21) being provided on the outer wall of the claw seat (20), a claw (22) corresponding to the clamping cavity (14) being clamped in the groove (21), and the claw (22) and the groove (21) being connected via a spring (24).

8. The packer with a sealed circulation sleeve suitable for one-trip half-stroke cementing according to claim 7, characterized in that: The inner upper end of the clamping cavity (14) is provided with a first inclined wall, the inner lower end of the clamping cavity (14) is provided with a right-angle wall, the upper surface of the clamping claw (22) is provided with a second inclined wall (23), and the surface of the clamping claw (22) facing the circulation section (10) is provided with a corrugated section.

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