Sliding sleeve valve, valve closing tool and multiple repeated opening and closing method of sliding sleeve valve

Abstract

The invention relates to the technical field of reservoir transformation, in particular to a sliding sleeve valve, a valve closing tool and a sliding sleeve valve multi-time repeated opening and closing method. The sliding sleeve valve comprises an upper outer cylinder, a lower outer cylinder, a valve element, a pawl and a pawl protrusion; the valve closing tool comprises an upper connector, a mandrel, a clamping block outer cylinder, a connecting cylinder, a locking inner cylinder, a locking outer cylinder, a first locking block, a second locking block and a lower connector. The multiple repeated opening and closing method for the sliding sleeve valve comprises the following steps that the sliding sleeve valve is connected into a well completion pipe column, the pipe column is put down according to normal operation, and fluid replacement setting is conducted. The clamping block is reasonable and compact in structure and convenient to use, by arranging the spring piece, the clamping block can move to the inner side of the lower portion of the clamping block body on the large-diameter section, so that the first locking block and the second locking block are clamped into the first locking ring groove and the second locking ring groove correspondingly, the clamping block body anchors a valve element, a valve closing tool and the valve element are integrated, and the valve closing efficiency is improved. The method has the characteristics of stability, reliability and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of reservoir transformation, and relates to a sleeve valve, a valve closing tool and a sleeve valve repeated opening and closing method. Background Art

[0002] With the improvement of oil and gas well development technology, the research on underground reservoirs has become more and more refined. Generally, the formation transformation has changed from the original integrated transformation to layered transformation. After the transformation is completed, production is generally carried out in multiple layers. As the pressure of underground oil and gas decreases, some formations may produce water. The formation water in the upper layer may submerge the oil and gas in the lower layer, causing the oil and gas well production capacity to decrease or become scrapped. At this time, it is necessary to find the water outlet point and seal the water outlet point. The general sliding sleeve does not have a re-closing function, so the oil and gas well can only be overhauled and the original well string removed, which requires relatively high production costs and time. Summary of the invention

[0003] The present invention provides a sleeve valve, a valve closing tool and a method for repeatedly opening and closing the sleeve valve, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the sleeve cannot be repeatedly opened and closed in the existing layered transformation.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a sliding sleeve valve includes an upper outer cylinder, a lower outer cylinder, a valve core, a pawl and a pawl protrusion, the lower outer cylinder is fixedly installed on the outer side of the lower end of the upper outer cylinder, a lower limit ring platform is provided on the inner side of the lower outer cylinder corresponding to the lower end position of the upper outer cylinder, a first limit groove and a second limit groove are provided at intervals from top to bottom on the inner side of the lower limit ring platform, an upper limit ring platform is provided on the inner side of the upper part of the upper outer cylinder, a valve core is provided in the upper outer cylinder corresponding to the lower side position of the upper limit ring platform, a limit ring groove is provided on the inner side of the upper end of the valve core, a first locking ring groove and a second locking ring groove are provided on the inner side of the upper part of the valve core An annular groove, a plurality of internal communicating holes that are connected inside and outside are arranged at intervals along the circumference in the middle of the valve core, a communicating annular groove is arranged on the inner side of the lower part of the upper outer cylinder corresponding to the position below the internal communicating hole, a plurality of external communicating holes that are connected inside and outside are arranged at intervals along the circumference on the upper outer cylinder corresponding to the position of the communicating annular groove, a plurality of guide vertical grooves are arranged at intervals along the circumference on the outer side of the lower part of the valve core, a guide pin with an inner end located in the guide vertical groove is arranged on the lower part of the upper outer cylinder corresponding to the lower end position of the guide vertical groove, a plurality of ratchet claws are arranged at intervals along the circumference on the outer side of the lower end of the valve core, and a ratchet protrusion with an outer end located in the first limiting groove is arranged on the outer side of the lower end of each ratchet claw.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned first locking ring groove may include a first tapered hole, a first straight hole and a second tapered hole connected in sequence from top to bottom, and the second locking ring groove may include a third tapered hole, a second straight hole and a fourth tapered hole connected in sequence from top to bottom. The first tapered hole and the third tapered hole are both in the shape of a truncated cone with a small top and a large bottom, and the second tapered hole and the fourth tapered hole are both in the shape of a truncated cone with a large top and a small bottom.

[0006] The above-mentioned first limiting groove may include a fifth tapered hole, a third straight hole and a sixth tapered hole connected in sequence from top to bottom, the second limiting groove includes a seventh tapered hole, a fourth straight hole and an eighth tapered hole connected in sequence from top to bottom, the fifth tapered hole and the seventh tapered hole are both in the shape of a truncated cone with a small top and a large bottom, and the sixth tapered hole and the eighth tapered hole are both in the shape of a truncated cone with a large top and a small bottom; the pawl protrusion matches the first limiting groove and the second limiting groove.

[0007] The above-mentioned may also include an O-ring, at least one O-ring is provided at an upper and lower interval between the upper outer cylinder and the valve core corresponding to the position above the inner connecting hole, at least one O-ring is provided at an upper and lower interval between the upper outer cylinder and the valve core corresponding to the position between the inner connecting hole and the outer connecting hole, and at least one O-ring is provided at an upper and lower interval between the upper outer cylinder and the valve core corresponding to the position between the outer connecting hole and the guide vertical groove.

[0008] The second technical solution of the present invention is achieved by the following measures: a valve closing tool used in conjunction with a sleeve valve comprises an upper joint, a core shaft, a clamp block outer cylinder, a connecting cylinder, The locking cylinder is fixedly installed on the inner side of the lower end of the upper joint, and the outer side of the upper end of the upper joint is fixedly installed with a core shaft, and the outer side of the upper end of the core shaft is fixedly installed with a card block outer cylinder by locking shear nails, and a seating ring platform is provided on the outer side of the upper section of the card block outer cylinder, and at least two installation windows that penetrate inside and outside are distributed along the circumference at intervals on the outer side of the middle of the card block outer cylinder, and an anchor component is installed in the installation window. A connecting cylinder located on the outer side of the core shaft is fixedly installed on the inner side of the lower end of the card block outer cylinder, and a lower joint is fixedly installed on the outer side of the lower end of the connecting cylinder, and a supporting ring platform is provided on the inner side of the lower end of the lower joint, and a locking outer cylinder is provided on the inner side of the lower joint corresponding to the position between the connecting cylinder and the supporting ring platform, and a locking inner cylinder is fixedly installed on the outer side of the lower end of the core shaft by shear nails, and a one-way locking component that can prevent the core shaft from moving upward relative to the locking outer cylinder is provided between the outer side of the locking inner cylinder and the inner side of the locking outer cylinder.

[0009] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned core shaft may include a large diameter section, a small diameter section and a locking section fixed together from top to bottom. The core shaft corresponding to the installation position above the window is the large diameter section, and the core shaft corresponding to the locking inner cylinder position is the locking section.

[0010] The above-mentioned anchoring assembly may include a block body and a spring sheet, a first locking block and a second locking block are provided at intervals on the upper and lower outer sides of the block body, a mounting long hole is provided on the upper outer side of the block outer tube corresponding to the middle position of the upper side of each mounting window, a mounting long groove is provided on the upper outer side of the core shaft corresponding to each mounting long hole position, an upper fixing hole is provided on the outer side of the block outer tube corresponding to the upper end position of each mounting long groove, a mounting inclined groove which is wide at the top and narrow at the bottom is provided on the inner side of the upper end of the block body, a lower fixing hole which can be connected with the mounting inclined groove is provided in the center of the lower outer side of the block body, a spring sheet is provided in the mounting long groove, the spring sheet includes a hanging part, a mounting part and a supporting part which are fixedly installed together from top to bottom in sequence, a hanging part is provided in the upper fixing hole, the mounting part is located at the lower part of the supporting part and is located in the mounting inclined groove, the lower end of the supporting part is located in the lower fixing hole, and the supporting part is inclined in an upper inside and lower outside shape.

[0011] The above-mentioned one-way locking assembly may include external stop teeth and internal stop teeth. At least one group of external stop teeth is continuously arranged from top to bottom on the outer side of the locking inner cylinder. The external stop teeth are a ring platform with a right-angled triangle cross-section, and the ring platform is wide at the top and narrow at the bottom. At least one group of internal stop teeth is continuously arranged from top to bottom on the inner side of the locking outer cylinder. The internal stop teeth are a ring platform with a right-angled triangle cross-section, and the ring platform is narrow at the top and wide at the bottom.

[0012] The third technical solution of the present invention is achieved by the following measures: a method for repeatedly opening and closing a sleeve valve using a sleeve valve and a valve closing tool, comprising the following steps: (1) Connect the sleeve valve to the completion string, run it into the string as normal, and set the valve with replacement fluid; (See attached Figure 1 shown) (2) When the sleeve needs to be opened, a soluble ball is dropped from the wellhead and waits for the ball to be seated. When the soluble ball falls into the limit ring groove provided on the inner side of the upper end of the valve core, pressure is applied from the pipe string. The soluble ball pushes the valve core downward. The ratchet protrusion at the lower end of the ratchet is compressed by the conical surface of the sixth conical hole. The outer diameter of the ratchet protrusion becomes smaller and slides from the first limit groove to the second limit groove. The guide vertical groove provided on the outer surface of the valve core by the guide pin slides from the bottom to the top. Under the limitation of the guide pin, the valve core stops moving. At this time, the ratchet protrusion is located in the second limit groove. The ratchet protrusion bounces back in the second limit groove and its outer diameter becomes larger. The inner connecting hole provided on the valve core is connected with the outer connecting hole provided on the upper outer cylinder under the action of the connecting ring groove. After the soluble ball is dissolved, the sleeve valve is opened. (3) When the sleeve valve needs to be closed, according to the location of the sleeve valve, if it is in a vertical well section, use a wire tool to connect the upper joint of the valve closing tool; if it is in a highly deviated well section or a horizontal section, use a coiled tubing to connect the upper joint of the valve closing tool; (See the attached Figure 2 shown) (4) Lower the valve closing tool into the well. When the valve closing tool is lowered into the upper end of the valve core, the seat ring provided on the outer tube of the clamping block is stuck in the limit ring groove provided on the inner side of the upper end of the valve core and cannot pass through. (As shown in the attached Figure 3 shown) (5) When the force is continued to be applied to the lower part, the upper joint drives the core shaft to move downward, the locking shear pins are cut off, and the large diameter section moves to the inner side of the lower part of the block body, so that the first locking block and the second locking block provided at intervals on the upper and lower sides of the outer side of the block body are respectively inserted into the first locking ring groove and the second locking ring groove provided at intervals on the upper and lower sides of the inner side of the valve core. At the same time, the locking inner cylinder provided at the lower part of the core shaft enters into the locking outer cylinder. Under the cooperation of the outer stop teeth and the inner stop teeth, the locking core shaft is prevented from moving upward relative to the locking outer cylinder. At this time, the valve closing tool and the valve core become a whole; (as shown in the attached Figure 4 shown) (6) Lift the upper joint upward, so that the valve closing tool drives the valve core upward. The pawl protrusion at the lower end of the pawl is compressed by the conical surface of the seventh conical hole, and the outer diameter of the pawl protrusion becomes smaller, and it slides from the second limit groove to the first limit groove. When the upper end of the valve core contacts the lower side of the upper limit ring, the guide vertical groove provided on the outer surface of the valve core by the guide pin slides from the top to the bottom. Under the limit of the guide pin, the valve core stops moving. At this time, the pawl protrusion is located in the first limit groove, and the pawl protrusion re-opens in the first limit groove, and the outer diameter becomes larger. The inner connecting hole provided on the valve core and the outer connecting hole provided on the upper outer cylinder are staggered, and the sliding sleeve valve is closed; (As shown in the attached figure, the inner connecting hole provided on the valve core is staggered with the outer connecting hole provided on the upper outer cylinder, and the sliding sleeve valve is closed.) Figure 5 shown) (7) Continue to lift the upper joint to move the valve closing tool upward, cut off the shear pins, and move the core shaft upward relative to the locking outer cylinder. When the large diameter section is located above the block body, the block body loses the support of the large diameter section, and the first locking block and the second locking block are no longer anchored in the first locking ring groove and the second locking ring groove. Under the action of the first tapered hole and the third tapered hole, the overall outer diameter of the block body becomes smaller, and the first locking block and the second locking block are disengaged from the first locking ring groove and the second locking ring groove. Continue to lift the upper joint until the valve closing tool is lifted out of the wellhead; (As shown in the attached figure) Figure 6 shown) (8) Repeat the above steps (2) to (7) to implement the method of repeatedly opening and closing the sliding sleeve valve.

[0013] The invention has a reasonable and compact structure and is easy to use. By arranging a spring sheet, the large-diameter section can be moved to the inner side of the lower part of the clamping block body, so that the first locking block and the second locking block are respectively clamped in the first locking ring groove and the second locking ring groove, so that the clamping block body anchors the valve core, and the valve closing tool and the valve core become a whole, which has the characteristics of stability, reliability and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the front half-section structure of embodiments 1 to 4 of the present invention.

[0015] Attached Figure 2 It is a schematic diagram of the front half-section structure of embodiments 5 to 8 of the present invention.

[0016] Attached Figure 3This is a schematic diagram of the structure of the front half-section diagram of Example 9 of the present invention. Figure 1 .

[0017] Attached Figure 4 This is a schematic diagram of the structure of the front half-section diagram of Example 9 of the present invention. Figure 2 .

[0018] Attached Figure 5 This is a schematic diagram of the structure of the front half-section diagram of Example 9 of the present invention. Figure 3 .

[0019] Attached Figure 6 This is a schematic diagram of the structure of the front half-section diagram of Example 9 of the present invention. Figure 4 .

[0020] The codes in the accompanying drawings are: 1 is an upper outer cylinder, 2 is a lower outer cylinder, 3 is a valve core, 4 is a ratchet, 5 is a ratchet convex, 6 is an upper limit ring platform, 7 is a lower limit ring platform, 8 is a first limit groove, 9 is a second limit groove, 10 is a limit ring groove, 11 is a first locking ring groove, 12 is a second locking ring groove, 13 is an inner connecting hole, 14 is a connecting ring groove, 15 is an outer connecting hole, 16 is a guide vertical groove, 17 is a guide pin, 18 is an O-ring, 19 is an upper joint, 20 is a large diameter section, 21 is a small diameter section 22 is the locking section, 23 is the block outer cylinder, 24 is the connecting cylinder, 25 is the locking inner cylinder, 26 is the locking outer cylinder, 27 is the first locking block, 28 is the second locking block, 29 is the lower joint, 30 is the locking shear nail, 31 is the hand-release shear nail, 32 is the seating ring platform, 33 is the installation window, 34 is the supporting ring platform, 35 is the block body, 36 is the spring sheet, 37 is the installation long hole, 38 is the installation long groove, 39 is the installation inclined groove, 40 is the outer stop tooth, 41 is the inner stop tooth, and 42 is the soluble ball. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2As shown in Figures 3, 4, 5 and 6, the sliding sleeve valve comprises an upper outer cylinder 1, a lower outer cylinder 2, a valve core 3, a pawl 4 and a pawl protrusion 5. The lower outer cylinder 2 is fixedly mounted on the outer side of the lower end of the upper outer cylinder 1. A lower limit ring platform 7 is arranged on the inner side of the lower outer cylinder 2 corresponding to the lower end position of the upper outer cylinder 1. A first limit groove 8 and a second limit groove 9 are arranged at intervals from top to bottom on the inner side of the lower limit ring platform 7. An upper limit ring platform 6 is arranged on the inner side of the upper part of the upper outer cylinder 1. A valve core 3 is arranged in the upper outer cylinder 1 corresponding to the lower side of the upper limit ring platform 6. A limit ring groove 10 is arranged on the inner side of the upper end of the valve core 3. A first locking ring groove 11 and a second locking ring groove 12 are arranged on the inner side of the upper part of the valve core 3. A plurality of inner communicating holes 13 are provided at intervals along the circumference, and a communicating annular groove 14 is provided on the inner side of the lower part of the upper outer cylinder 1 corresponding to the position below the inner communicating hole 13. A plurality of outer communicating holes 15 are provided at intervals along the circumference, and a plurality of guide vertical grooves 16 are provided at intervals along the circumference on the outer side of the lower part of the valve core 3. A guide pin 17 with the inner end located in the guide vertical groove 16 is provided on the lower part of the upper outer cylinder 1 corresponding to the lower end position of the guide vertical groove 16. A plurality of ratchet pawls 4 are provided at intervals along the circumference on the outer side of the lower end of the valve core 3. A ratchet protrusion 5 with the outer end located in the first limiting groove 8 is provided on the outer side of the lower end of each ratchet pawl 4. When the spool 3 is in the process of being opened, the soluble ball 42 is dropped into the wellhead and the ball is seated. When the soluble ball 42 falls into the limiting ring groove 10 provided on the inner side of the upper end of the valve core 3, pressure is applied from the pipe string, and the soluble ball 42 pushes the valve core 3 to move downward. The outer diameter of the pawl protrusion 5 at the lower end of the ratchet 4 becomes smaller under the action of the first limiting groove 8 and slides from the first limiting groove 8 to the second limiting groove 9. The guide vertical groove 16 provided on the outer surface of the valve core 3 by the guide pin 17 slides from the bottom to the top. Under the limitation of the guide pin 17, the valve core 3 stops moving. At this time, the ratchet protrusion 5 is located in the second limiting groove 9, and the ratchet protrusion 5 re-opens in the second limiting groove 9, and the outer diameter becomes larger. The inner communicating hole 13 provided on the valve core 3 is connected with the outer communicating hole 15 provided on the upper outer tube 1 under the action of the communicating ring groove 14. After the soluble ball 42 is dissolved, the sleeve valve is opened.

[0024] The above-mentioned sleeve valve can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, the first locking ring groove 11 includes a first tapered hole, a first straight hole, and a second tapered hole that are sequentially connected from top to bottom, and the second locking ring groove 12 includes a third tapered hole, a second straight hole, and a fourth tapered hole that are sequentially connected from top to bottom. The first tapered hole and the third tapered hole are both in the shape of a truncated cone with a small top and a large bottom, and the second tapered hole and the fourth tapered hole are both in the shape of a truncated cone with a large top and a small bottom. During use, such an arrangement facilitates the first locking block 27 and the second locking block 28 provided on the valve closing tool to be respectively inserted into the first locking ring groove 11 and the second locking ring groove 12, so that the block body 35 anchors the valve core 3, and the valve closing tool and the valve core 3 become a whole.

[0025] Embodiment 3: As attached Figure 1 , 2 As shown in , 3, 4, 5, and 6, the first limiting groove 8 includes a fifth tapered hole, a third straight hole, and a sixth tapered hole connected in sequence from top to bottom, the second limiting groove 9 includes a seventh tapered hole, a fourth straight hole, and an eighth tapered hole connected in sequence from top to bottom, the fifth tapered hole and the seventh tapered hole are both in the shape of a truncated cone with a small top and a large bottom, and the sixth tapered hole and the eighth tapered hole are both in the shape of a truncated cone with a large top and a small bottom; the ratchet protrusion 5 matches the first limiting groove 8 and the second limiting groove 9. During use, the outer diameter of the ratchet protrusion 5 is convenient to become smaller or pop out.

[0026] Embodiment 4: As attached Figure 1 , 2 , 3, 4, 5, and 6, it also includes an O-ring 18, at least one O-ring 18 is arranged between the upper outer tube 1 and the valve core 3 at the upper position of the inner communication hole 13, at least one O-ring 18 is arranged between the upper outer tube 1 and the valve core 3 at the upper position between the inner communication hole 13 and the outer communication hole 15, and at least one O-ring 18 is arranged between the upper outer tube 1 and the valve core 3 at the upper position between the outer communication hole 15 and the vertical guide groove 16. In the process of use, such an arrangement is convenient to ensure the sealing between the components.

[0027] Embodiment 5: As attached Figure 1 , 2As shown in Figures 3, 4, 5 and 6, the valve closing tool used in conjunction with the sliding sleeve valve comprises an upper joint 19, a core shaft, a clamping block outer cylinder 23, a connecting cylinder 24, a locking inner cylinder 25, a locking outer cylinder 26, a first locking block 27, a second locking block 28 and a lower joint 29. A core shaft is fixedly installed on the inner side of the lower end of the upper joint 19, and a clamping block outer cylinder 23 is fixedly installed on the outer side of the upper part of the core shaft through a locking shear nail 30. A seating ring pedestal 32 is provided on the outer side of the upper section of the clamping block outer cylinder 23. At least two installation windows 33 that are connected inside and outside are distributed at intervals along the circumference on the outer side of the middle part of the clamping block outer cylinder 23. An anchoring assembly is installed in the installation window 33. A first locking ring groove 11 and a second locking ring groove 12 are provided on the outer side of the anchoring assembly. Block 27 and a second locking block 28, a connecting cylinder 24 located on the outside of the core shaft is fixedly installed on the inner side of the lower end of the card block outer cylinder 23, a lower joint 29 is fixedly installed on the outer side of the lower end of the connecting cylinder 24, a supporting ring platform 34 is provided on the inner side of the lower end of the lower joint 29, a locking outer cylinder 26 is provided on the inner side of the lower joint 29 corresponding to the position between the connecting cylinder 24 and the supporting ring platform 34, a locking inner cylinder 25 is fixedly installed on the outer side of the lower end of the core shaft through a hand-release shear nail 31, and a one-way locking component is provided between the outer side of the locking inner cylinder 25 and the inner side of the locking outer cylinder 26, which can prevent the core shaft from moving upward relative to the locking outer cylinder 26.During use, the valve closing tool is lowered into the well. When the valve closing tool is lowered into the upper end of the valve core 3, the seat ring 32 provided on the outer tube 23 of the clamp block is clamped into the limit ring groove 10 provided on the inner side of the upper end of the valve core 3 and cannot pass through; when the force is continued to be applied to the lower part, the upper joint 19 drives the core shaft to move downward, the locking shear nail 30 is cut off, and the large diameter section 20 moves to the inner side of the lower part of the clamp block body 35, so that the first locking block 27 and the second locking block 28 provided at intervals on the upper and lower sides of the outer side of the clamp block body 35 are respectively clamped into the first locking block 27 and the second locking block 28 provided at intervals on the upper and lower sides of the inner side of the upper part of the valve core 3. The locking annular groove 11 and the second locking annular groove 12 are formed. At the same time, the locking inner cylinder 25 arranged at the lower part of the core shaft enters the locking outer cylinder 26. Under the cooperation of the outer stop tooth 40 and the inner stop tooth 41, the locking core shaft is prevented from moving upward relative to the locking outer cylinder 26. At this time, the valve closing tool and the valve core 3 become a whole; the upper joint 19 is lifted up, so that the valve closing tool drives the valve core 3 upward. The ratchet protrusion 5 at the lower end of the ratchet 4 is compressed by the conical surface of the seventh conical hole, and the outer diameter of the ratchet protrusion 5 becomes smaller, and it slides from the second limit groove 9 to the first limit groove 8. When the valve core 3 is on When the upper end of the valve core 3 abuts against the lower side of the upper limit ring 6, the guide pin 17 slides from the top to the bottom in the guide vertical groove 16 provided on the outer surface of the valve core 3. Under the limit of the guide pin 17, the valve core 3 stops moving. At this time, the ratchet protrusion 5 is located in the first limit groove 8. The ratchet protrusion 5 is re-opened in the first limit groove 8, and the outer diameter becomes larger. The inner connecting hole 13 provided on the valve core 3 is staggered with the outer connecting hole 15 provided on the upper outer tube 1, and the sliding valve is closed. Continue to lift the upper joint 19 to make the valve closing tool move upward, cut off the shear pin 31, and make the core shaft relative to the upper end of the valve core 3. The locking outer cylinder 26 moves upward, and when the large diameter section 20 is located above the block body 35, the block body 35 loses the support of the large diameter section 20, and the first locking block 27 and the second locking block 28 are no longer anchored in the first locking ring groove 11 and the second locking ring groove 12. Under the action of the first tapered hole and the third tapered hole, the overall outer diameter of the block body 35 becomes smaller, and the first locking block 27 and the second locking block 28 are disengaged from the first locking ring groove 11 and the second locking ring groove 12, and the upper joint 19 continues to be lifted until the valve closing tool is lifted out of the wellhead.

[0028] The above valve closing tools can be further optimized and / or improved according to actual needs: Embodiment 6: As attached Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, the mandrel includes a large diameter section 20, a small diameter section 21, and a locking section 22 that are fixedly installed together from top to bottom. The mandrel corresponding to the position above the window 33 is the large diameter section 20, and the mandrel corresponding to the position of the locking inner cylinder 25 is the locking section 22. In use, through such an arrangement, the large diameter section 20 is convenient for supporting the block body 35.

[0029] Embodiment 7: As attached Figure 1 , 2As shown in , 3, 4, 5, and 6, the anchoring assembly includes a card block body 35 and a spring piece 36. The outer side of the card block body 35 is provided with a first locking block 27 and a second locking block 28 at intervals from top to bottom. The outer side of the upper part of the card block outer cylinder 23 corresponding to the middle position of the upper side of each mounting window 33 is provided with a mounting long hole 37, the outer side of the upper part of the core shaft corresponding to the position of each mounting long hole 37 is provided with a mounting long groove 38, and the outer side of the card block outer cylinder 23 corresponding to the upper end position of each mounting long groove 38 is provided with an upper fixing hole, the inner side of the upper end of the card block body 35 is provided with a mounting oblique groove 39 which is wide at the top and narrow at the bottom, and the center of the lower outer side of the card block body 35 is provided with a lower fixing hole which can be connected with the mounting oblique groove 39, and the mounting long groove 38 is provided with a spring piece 36, and the spring piece 36 includes a hanging part, a mounting part and a supporting part which are fixedly installed together from top to bottom in sequence, and the upper fixing hole is provided with a hanging part, the mounting part is located at the lower part of the supporting part and is located in the mounting oblique groove 39, and the lower end of the supporting part is located in the lower fixing hole, and the supporting part is inclined in an upper-inner-lower-outer shape. During use, by setting the spring sheet 36, the large diameter section 20 can be moved to the inner side of the lower part of the block body 35, so that the first locking block 27 and the second locking block 28 are respectively inserted into the first locking ring groove 11 and the second locking ring groove 12, so that the block body 35 anchors the valve core 3, making the valve closing tool and the valve core 3 become a whole.

[0030] Embodiment 8: As attached Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, the one-way locking assembly includes an outer stop tooth 40 and an inner stop tooth 41. At least one set of outer stop teeth 40 is continuously arranged from top to bottom on the outer side of the locking inner cylinder 25. The outer stop teeth 40 are ring platforms with a right-angled triangle cross section and are wide at the top and narrow at the bottom. At least one set of inner stop teeth 41 is continuously arranged from top to bottom on the inner side of the locking outer cylinder 26. The inner stop teeth 41 are ring platforms with a right-angled triangle cross section and are narrow at the top and wide at the bottom. In use, such an arrangement is used to prevent the core shaft from moving upward relative to the locking outer cylinder 26.

[0031] Embodiment 9: As attached Figure 1 , 2 As shown in , 3, 4, 5, and 6, a method for repeatedly opening and closing a sleeve valve using a sleeve valve and a valve closing tool comprises the following steps: (1) Connect the sleeve valve to the completion string, run it into the string as normal, and set the valve with replacement fluid; (See attached Figure 1 shown) (2) When the sleeve needs to be opened, a soluble ball 42 is dropped from the wellhead and waits for the ball to be seated. When the soluble ball 42 falls into the limiting ring groove 10 provided on the inner side of the upper end of the valve core 3, pressure is applied from the inside of the pipe string. The soluble ball 42 pushes the valve core 3 to move downward. The ratchet protrusion 5 at the lower end of the ratchet 4 is compressed by the conical surface of the sixth conical hole. The outer diameter of the ratchet protrusion 5 becomes smaller and slides from the first limiting groove 8 to the second limiting groove 9. The guide vertical groove 16 provided on the outer surface of the valve core 3 by the guide pin 17 slides from the bottom end to the top end. Under the limitation of the guide pin 17, the valve core 3 stops moving. At this time, the ratchet protrusion 5 is located in the second limiting groove 9. The ratchet protrusion 5 re-opens in the second limiting groove 9 and the outer diameter becomes larger. The inner connecting hole 13 provided on the valve core 3 is connected with the outer connecting hole 15 provided on the upper outer tube 1 under the action of the connecting ring groove 14. After the soluble ball 42 is dissolved, the sleeve valve is opened. (3) When the sleeve valve needs to be closed, according to the location of the sleeve valve, if it is in a vertical well section, use a wire tool to connect the upper joint 19 of the valve closing tool; if it is in a highly deviated well section or a horizontal section, use a coiled tubing to connect the upper joint 19 of the valve closing tool; (See Appendix Figure 2 shown) (4) Lower the valve closing tool into the well. When the valve closing tool is lowered into the upper end of the valve core 3, the seat ring 32 provided on the outer tube 23 of the clamping block is clamped into the limiting ring groove 10 provided on the inner side of the upper end of the valve core 3 and cannot pass through; (See attached Figure 3 shown) (5) When the force is continuously applied to the lower part, the upper joint 19 drives the core shaft to move downward, the locking shear nail 30 is cut off, and the large diameter section 20 moves to the inner side of the lower part of the block body 35, so that the first locking block 27 and the second locking block 28 provided at intervals on the upper and lower sides of the outer side of the block body 35 are respectively inserted into the first locking ring groove 11 and the second locking ring groove 12 provided at intervals on the upper and lower sides of the inner side of the valve core 3. At the same time, the locking inner cylinder 25 provided at the lower part of the core shaft enters into the locking outer cylinder 26. Under the cooperation of the outer stop teeth 40 and the inner stop teeth 41, the locking core shaft is prevented from moving upward relative to the locking outer cylinder 26. At this time, the valve closing tool and the valve core 3 become a whole; (as shown in the attached figure) Figure 4 shown) (6) Lift the upper joint 19 so that the valve closing tool drives the valve core 3 upward. The outer diameter of the ratchet protrusion 5 at the lower end of the ratchet 4 becomes smaller under the compression of the conical surface of the seventh conical hole, and the ratchet protrusion 5 slides from the second limit groove 9 to the first limit groove 8. When the upper end of the valve core 3 abuts against the lower side of the upper limit ring 6, the guide pin 17 slides from the top to the bottom of the guide vertical groove 16 provided on the outer surface of the valve core 3. Under the limitation of the guide pin 17, the valve core 3 stops moving. At this time, the ratchet protrusion 5 is located in the first limit groove 8. The ratchet protrusion 5 re-opens in the first limit groove 8, and the outer diameter becomes larger. The inner communication hole 13 provided on the valve core 3 is offset from the outer communication hole 15 provided on the upper outer tube 1, and the sliding sleeve valve is closed; (See Appendix 1 for details) Figure 5 shown) (7) Continue to lift the upper joint 19 to move the valve closing tool upward, cut off the shear pin 31, and move the core shaft upward relative to the locking outer cylinder 26. When the large diameter section 20 is located above the block body 35, the block body 35 loses the support of the large diameter section 20, and the first locking block 27 and the second locking block 28 are no longer anchored in the first locking ring groove 11 and the second locking ring groove 12. Under the action of the first tapered hole and the third tapered hole, the overall outer diameter of the block body 35 becomes smaller, and the first locking block 27 and the second locking block 28 are disengaged from the first locking ring groove 11 and the second locking ring groove 12. Continue to lift the upper joint 19 until the valve closing tool is lifted out of the wellhead; (See Appendix 1 for details) Figure 6 shown) (8) Repeat the above steps (2) to (7) to implement the method of repeatedly opening and closing the sliding sleeve valve.

[0032] During use, the present application adopts a sleeve valve and a valve closing tool, and different soluble balls 42 can be put into the sleeve valves corresponding to different strata during layered transformation. When the current layer is transformed, the soluble ball 42 can be used to temporarily block the lower stratum. During normal production, when water comes out of a certain stratum, the corresponding valve closing tool is lowered to close the sleeve of the current layer to achieve continuous production. After the valve closing tool closes the sleeve of the current layer, the soluble ball 42 can be re-inserted after the shear pin 31 is lifted up to cut off the hand-release shear nail 31 and the valve closing tool is removed to open the sleeve valve.

[0033] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A sleeve valve, characterized in that The utility model comprises an upper outer cylinder, a lower outer cylinder, a valve core, a pawl and a pawl protrusion, wherein the lower outer cylinder is fixedly installed on the outer side of the lower end of the upper outer cylinder, a lower limit ring platform is arranged on the inner side of the lower outer cylinder corresponding to the lower end position of the upper outer cylinder, a first limit groove and a second limit groove are arranged at intervals from top to bottom on the inner side of the lower limit ring platform, an upper limit ring platform is arranged on the inner side of the upper part of the upper outer cylinder, a valve core is arranged in the upper outer cylinder corresponding to the lower side position of the upper limit ring platform, a limit ring groove is arranged on the inner side of the upper end of the valve core, a first locking ring groove and a second locking ring groove are arranged at intervals from top to bottom on the inner side of the upper part of the valve core, and a plurality of locking ring grooves are arranged on the middle part of the valve core along the circumference. A plurality of internal communicating holes are connected inside and outside, a communicating annular groove is provided on the inner side of the lower part of the upper outer cylinder corresponding to the position below the internal communicating holes, a plurality of external communicating holes are provided at intervals along the circumference on the upper outer cylinder corresponding to the position of the communicating annular groove, a plurality of guide vertical grooves are provided at intervals along the circumference on the outer side of the lower part of the valve core, a guide pin with an inner end located in the guide vertical groove is provided on the lower part of the upper outer cylinder corresponding to the lower end position of the guide vertical groove, a plurality of pawls are provided at intervals along the circumference on the outer side of the lower end of the valve core, and a pawl protrusion with an outer end located in the first limiting groove is provided on the outer side of the lower end of each pawl.

2. The sliding sleeve valve according to claim 1, characterized in that The first locking ring groove includes a first tapered hole, a first straight hole, and a second tapered hole which are connected in sequence from top to bottom, and the second locking ring groove includes a third tapered hole, a second straight hole, and a fourth tapered hole which are connected in sequence from top to bottom. The first tapered hole and the third tapered hole are both in the shape of a truncated cone which is small at the top and large at the bottom, and the second tapered hole and the fourth tapered hole are both in the shape of a truncated cone which is large at the top and small at the bottom.

3. The sliding sleeve valve according to claim 1 or 2, characterized in that The first limiting groove includes a fifth tapered hole, a third straight hole and a sixth tapered hole which are connected in sequence from top to bottom; the second limiting groove includes a seventh tapered hole, a fourth straight hole and an eighth tapered hole which are connected in sequence from top to bottom; the fifth tapered hole and the seventh tapered hole are both in the shape of a truncated cone which is small at the top and large at the bottom; the sixth tapered hole and the eighth tapered hole are both in the shape of a truncated cone which is large at the top and small at the bottom; the ratchet protrusion matches the first limiting groove and the second limiting groove.

4. The sliding sleeve valve according to claim 1, 2 or 3, characterized in that It also includes an O-ring, at least one O-ring is provided between the upper outer cylinder and the valve core at the upper position above the inner communicating hole, at least one O-ring is provided between the upper outer cylinder and the valve core at the upper position between the inner communicating hole and the outer communicating hole, and at least one O-ring is provided between the upper outer cylinder and the valve core at the upper position between the outer communicating hole and the guide vertical groove.

5. A valve closing tool used in conjunction with the sliding sleeve valve according to any one of claims 1 to 4, characterized in that The lock assembly comprises an upper joint, a core shaft, a card block outer cylinder, a connecting cylinder, a locking inner cylinder, a locking outer cylinder, a first locking block, a second locking block and a lower joint, wherein the core shaft is fixedly installed on the inner side of the lower end of the upper joint, and the card block outer cylinder is fixedly installed on the outer side of the upper part of the core shaft through locking shear nails, and a seating ring platform is provided on the outer side of the upper section of the card block outer cylinder, and at least two installation windows that are through-through are distributed along the circumference at intervals on the outer side of the middle part of the card block outer cylinder, and an anchoring assembly is installed in the installation window, and a first locking block and a second locking block that can match the first locking ring groove and the second locking ring groove are provided on the outer side of the anchoring assembly, a connecting cylinder located on the outer side of the core shaft is fixedly installed on the inner side of the lower end of the connecting cylinder, and a lower joint is fixedly installed on the outer side of the lower end of the lower joint, and a supporting ring platform is provided on the inner side of the lower joint corresponding to the position between the connecting cylinder and the supporting ring platform, and a locking outer cylinder is fixedly installed on the outer side of the lower end of the core shaft through shear nails, and a one-way locking assembly that can prevent the core shaft from moving upward relative to the locking outer cylinder is provided between the outer side of the locking inner cylinder and the inner side of the locking outer cylinder.

6. The valve closing tool according to claim 5, characterized in that The core shaft includes a large diameter section, a small diameter section and a locking section which are fixedly installed together from top to bottom. The core shaft corresponding to the installation position above the window is the large diameter section, and the core shaft corresponding to the locking position of the inner cylinder is the locking section.

7. The valve closing tool according to claim 5 or 6, characterized in that The anchoring assembly comprises a card block body and a spring sheet, a first locking block and a second locking block are provided at intervals on the upper and lower outer sides of the card block body, a mounting long hole is provided on the upper outer side of the card block outer tube corresponding to the middle position of the upper side of each mounting window, a mounting long groove is provided on the upper outer side of the core shaft corresponding to each mounting long hole position, an upper fixing hole is provided on the outer side of the card block outer tube corresponding to the upper end position of each mounting long groove, a mounting inclined groove which is wide at the top and narrow at the bottom is provided on the inner side of the upper end of the card block body, a lower fixing hole which can be connected with the mounting inclined groove is provided in the center of the outer side of the lower part of the card block body, a spring sheet is provided in the mounting long groove, the spring sheet comprises a hanging part, a mounting part and a supporting part which are fixedly installed together from top to bottom in sequence, a hanging part is provided in the upper fixing hole, the mounting part is located at the lower part of the supporting part and is located in the mounting inclined groove, the lower end of the supporting part is located in the lower fixing hole, and the supporting part is inclined in an upper inside and lower outside shape.

8. The valve closing tool according to claim 5, 6 or 7, characterized in that The one-way locking assembly includes outer stop teeth and inner stop teeth. At least one group of outer stop teeth is continuously arranged from top to bottom on the outer side of the locking inner cylinder. The outer stop teeth are a ring platform with a right-angled triangle cross-section, which is wide at the top and narrow at the bottom. At least one group of inner stop teeth is continuously arranged from top to bottom on the inner side of the locking outer cylinder. The inner stop teeth are a ring platform with a right-angled triangle cross-section, which is narrow at the top and wide at the bottom.

9. A method for repeatedly opening and closing a sleeve valve using the sleeve valve as claimed in claim 4 and the valve closing tool as claimed in claim 8, characterized in that The steps include: (1) Connect the sleeve valve to the completion string, run it into the string as normal, and set the valve with fluid replacement; (2) When the sleeve needs to be opened, a soluble ball is dropped from the wellhead and waits for the ball to be seated. When the soluble ball falls into the limit ring groove provided on the inner side of the upper end of the valve core, pressure is applied from the pipe string. The soluble ball pushes the valve core downward. The ratchet protrusion at the lower end of the ratchet is compressed by the conical surface of the sixth conical hole. The outer diameter of the ratchet protrusion becomes smaller and slides from the first limit groove to the second limit groove. The guide vertical groove provided on the outer surface of the valve core by the guide pin slides from the bottom to the top. Under the limitation of the guide pin, the valve core stops moving. At this time, the ratchet protrusion is located in the second limit groove. The ratchet protrusion bounces back in the second limit groove and its outer diameter becomes larger. The inner connecting hole provided on the valve core is connected with the outer connecting hole provided on the upper outer cylinder under the action of the connecting ring groove. After the soluble ball is dissolved, the sleeve valve is opened. (3) When the sleeve valve needs to be closed, according to the location of the sleeve valve, if it is in a vertical well section, use a wire tool to connect the upper joint of the valve closing tool; if it is in a highly deviated well section or a horizontal section, use a coiled tubing to connect the upper joint of the valve closing tool; (4) Lower the valve closing tool into the well. When the valve closing tool reaches the upper end of the valve core, the seat ring provided on the outer tube of the clamping block is stuck in the limit ring groove provided on the inner side of the upper end of the valve core and cannot pass through. (5) When the force is continued to be applied to the lower part, the upper joint drives the core shaft to move downward, the locking shear pins are cut off, and the large diameter section moves to the inner side of the lower part of the clamp body, so that the first locking block and the second locking block provided at intervals on the upper and lower sides of the outer side of the clamp body are respectively inserted into the first locking ring groove and the second locking ring groove provided at intervals on the upper and lower sides of the inner side of the valve core. At the same time, the locking inner cylinder provided at the lower part of the core shaft enters into the locking outer cylinder. Under the cooperation of the outer stop teeth and the inner stop teeth, the locking core shaft is prevented from moving upward relative to the locking outer cylinder. At this time, the valve closing tool and the valve core become a whole. (6) Lift the upper joint upward, so that the valve closing tool drives the valve core upward. The pawl protrusion at the lower end of the pawl is compressed by the conical surface of the seventh conical hole, and the outer diameter of the pawl protrusion becomes smaller, and it slides from the second limit groove to the first limit groove. When the upper end of the valve core contacts the lower side of the upper limit ring, the guide vertical groove provided on the outer surface of the valve core by the guide pin slides from the top to the bottom. Under the limitation of the guide pin, the valve core stops moving. At this time, the pawl protrusion is located in the first limit groove, and the pawl protrusion bounces back in the first limit groove, and the outer diameter becomes larger. The inner connecting hole provided on the valve core and the outer connecting hole provided on the upper outer cylinder are offset, and the sliding sleeve valve is closed. (7) Continue to lift the upper joint to move the valve closing tool upward, cut off the shear pins, and move the core shaft upward relative to the locking outer cylinder. When the large diameter section is located above the block body, the block body loses the support of the large diameter section, and the first locking block and the second locking block are no longer anchored in the first locking ring groove and the second locking ring groove. Under the action of the first tapered hole and the third tapered hole, the overall outer diameter of the block body becomes smaller, and the first locking block and the second locking block are disengaged from the first locking ring groove and the second locking ring groove. Continue to lift the upper joint until the valve closing tool is lifted out of the wellhead; (8) Repeat the above steps (2) to (7) to implement the method of repeatedly opening and closing the sliding sleeve valve.

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