Oil passing pipe bridge plug tool

Abstract

The utility model discloses an oil passing pipe bridge plug tool, which comprises a central pipe, the upper cone assembly is arranged on the outer side of the central pipe in a sleeving manner; the upper slip is arranged on the outer side of the central pipe in a sleeving mode and located above the upper cone assembly; the outer sleeve assembly sleeves the outer side of the central pipe, and the lower end of the outer sleeve assembly is connected with the upper slip; the outer sleeve assembly is fixed to the center pipe through a shear pin, and after the shear pin is sheared off, the outer sleeve assembly can push the upper slip downwards, so that the upper slip abuts against the upper cone assembly, and expansion is completed. The rubber sleeve assembly sleeves the outer side of the central pipe, the upper end of the rubber sleeve assembly is fixed with the central pipe, and the lower end can axially move relative to the central pipe; the lower slip is arranged on the outer side of the central pipe in a sleeving mode and located below the rubber sleeve assembly. A bidirectional anchoring structure is adopted, bidirectional pressure difference can be borne, and the setting effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field tool technology, specifically to an oil pipeline bridge plug tool. Background Technology

[0002] As oil and gas well development enters the mid-to-late stages, most producing formations begin to produce water, and production gradually decreases. Especially when water production is excessive, the reservoir's energy is insufficient to drive the water to the surface. At this point, water gradually accumulates in the wellbore. As the hydrostatic column increases, the formation's oil and gas struggle to overcome this resistance, leading to the eventual loss of production in these older wells. Therefore, most oil and gas fields begin extending the production of older wells early in the production phase by using historical data simulation and prediction, and employing various drainage and gas / oil recovery technologies. Among these, running small-diameter tubing and utilizing capillary siphon principles to drive fluid flow is the simplest and most economical method, widely used by most oilfields. In the later stages of development, geological reserves have reached a certain level, and the remaining oil recovery potential is limited, with a comprehensive water cut as high as 97%. According to the oilfield company's overall production capacity planning, a gas storage facility is planned for construction. Wells that have been shut down or temporarily abandoned are located in the gas storage area. To ensure the gas storage facility's airtightness, small-diameter tubing needs to be sealed with bridge plugs. However, existing commonly used bridge plug tools are not firmly anchored after setting, resulting in poor setting effect. Utility Model Content

[0003] To address the aforementioned problems, this application provides a cross-pipe bridge plug tool.

[0004] The objective of this utility model is achieved through the following technical solution: a pipeline bridge plug tool, comprising:

[0005] Central tube;

[0006] The upper conical assembly is sleeved on the outside of the central tube;

[0007] The upper slip is fitted onto the outside of the central tube and is located above the upper cone assembly;

[0008] The outer sleeve assembly is fitted onto the outside of the central tube, and its lower end is connected to the upper clamp. The outer sleeve assembly is fixed to the central tube by a shear pin. When the shear pin is cut, the outer sleeve assembly can push the upper clamp downward, so that the upper clamp abuts against the upper cone assembly, thus completing the expansion.

[0009] The rubber sleeve assembly is sleeved on the outside of the central tube, with its upper end fixed to the central tube and its lower end able to move axially relative to the central tube.

[0010] The lower clamp is fitted onto the outside of the central tube and is located below the rubber sleeve assembly;

[0011] A switching assembly is sleeved on the outside of the central tube, and its upper end is connected to the lower slip. The central tube can move up and down relative to the switching assembly. When the central tube moves down relative to the switching assembly, the rubber sleeve assembly can abut against the lower slip to expand the lower slip and seal the rubber sleeve assembly.

[0012] The lower plug is connected to the lower end of the central tube and is used to seal the central tube.

[0013] Furthermore, the outer sleeve assembly includes an upper connector and a connecting sleeve; the upper end of the connecting sleeve is threadedly connected to the upper connector, and its lower end is connected to the upper clamp; the connecting sleeve is fixed to the central tube by the shear pin.

[0014] A locking shaft is also provided on the outside of the central tube, and a locking ring is provided between the locking shaft and the upper connector; the outer surface of the locking shaft is provided with locking shaft teeth, and the inner surface of the locking ring is provided with locking ring teeth; the locking shaft teeth can mesh with the locking ring teeth so that the outer sleeve assembly can only move downward along the central tube, and the interior of the upper connector is provided with an upper connector shoulder for limiting the downward movement of the outer sleeve assembly.

[0015] The upper conical assembly includes: a small locking block, a large locking block, and an upper conical body with a conical upper end; the inner wall of the upper conical body is provided with a cavity, the outer wall of the central tube is provided with a mounting hole, one end of the small locking block is installed in the mounting hole by a spring, and the other end is stuck in the cavity; the outer wall of the central tube is also provided with a keyway, the large locking block is installed in the keyway, and the upper conical body and the central tube are in clearance fit.

[0016] The glue tube assembly includes an upper glue tube seat, a glue tube, a lower glue tube seat, and a lower cone, which are sleeved on the outside of the central tube and connected in sequence. The upper glue tube seat is fixedly connected to the central tube, and the glue tube, the lower glue tube seat, and the lower cone are all clearance fits with the central tube. The lower cone is inverted cone shape.

[0017] The switching assembly includes a straightening component and a slotted sleeve; the upper end of the straightening component is connected to the lower clamp, and the lower end is connected to the slotted sleeve; a slide is provided on the outer wall of the central tube, and a switching pin is provided on the inner wall of the slotted sleeve, which is inserted into the slide. The switching pin can be switched from a first position to a second position on the slide to unlock the central tube from the switching assembly.

[0018] The slide includes a short slide, a long slide, and a guide section formed on the outer wall of the central tube; the short slide and the long slide are distributed circumferentially along the central tube and extend axially along the central tube; the guide section connects the short slide and the long slide and is used to guide the switching pin from the short slide to the long slide.

[0019] The straightening assembly includes a spring sleeve with its upper end connected to the lower clamp and its lower end connected to the grooved sleeve, and several straightening springs circumferentially installed on the outer wall of the spring sleeve.

[0020] The central tube includes an upper central tube and a lower central tube; the upper central tube is connected to the upper end of the upper glue tube seat, and the lower central tube is connected to the lower end of the upper glue tube seat.

[0021] The upper connector is provided with pin holes.

[0022] Compared with the prior art, this application has the following beneficial effects: the present invention adopts a bidirectional anchoring structure, which can withstand bidirectional pressure difference and improve the sealing effect.

[0023] Some of the additional features of this application will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, or upon understanding the production or operation of the embodiments. The features disclosed in this application can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0024] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components.

[0025] Figure 1 This is a partial cross-sectional view of the present invention.

[0026] Figure 2 This is a schematic diagram of the locking ring and locking shaft of this utility model.

[0027] Figure 3 This is a schematic diagram of the slide of this utility model.

[0028] The reference numerals in the above figures are as follows: 1-Upper connector, 2-Pin hole, 3-Locking ring, 31-Locking ring tooth, 4-Locking shaft, 41-Locking shaft tooth, 5-Upper center tube, 6-Connecting sleeve, 7-Upper slip, 8-Upper cone, 10-Small locking block, 11-Large locking block, 12-Keyway, 13-Center tube shoulder, 14-Upper rubber sleeve seat, 15-Rubber sleeve, 16-Lower cone, 17-Lower slip, 18-Straightening spring, 19-Slide rail, 191-Long slide rail, 192-Short slide rail, 193-Guide part, 20-Switching pin, 21-Groogging sleeve, 22-Lower plug, 23-Lower center tube, 24-Lower rubber sleeve seat, 25-Spring sleeve, 26-Shearing pin, 27-Upper connector shoulder. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments.

[0030] Example

[0031] like Figure 1 As shown, this embodiment discloses an oil pipe bridge plug tool, including: a central tube, an upper cone assembly, an upper slip 7, an outer sleeve assembly, a rubber sleeve assembly, a lower slip 17, a switching assembly, and a lower plug 22.

[0032] The central tube comprises an upper central tube 5 and a lower central tube 23, which are connected as a whole by a rubber sleeve assembly. Specifically, the rubber sleeve assembly includes an upper rubber sleeve seat 14, a rubber sleeve 15, a lower rubber sleeve seat 24, and a lower cone 16. The lower end of the upper central tube 5 is inserted into the inner hole at the upper end of the upper rubber sleeve seat 14 and is threadedly connected to the upper end of the upper rubber sleeve seat 14. The upper end of the lower central tube 23 is inserted into the inner hole at the lower end of the upper rubber sleeve seat 14 and is threadedly connected to the lower end of the upper rubber sleeve seat 14. Thus, the upper central tube 5 and the lower central tube 23 are connected as a whole by the upper rubber sleeve seat 14. The rubber sleeve 15, the lower rubber sleeve seat 24, and the lower cone 16 are sleeved on the outside of the lower central tube 23 from top to bottom. The rubber sleeve 15 is threadedly connected to the upper rubber sleeve seat 14, the lower rubber sleeve seat 24 is threadedly connected to the lower end of the rubber sleeve 15, and the lower cone 16 is threadedly connected to the lower rubber sleeve seat 24. The rubber sleeve 15, the lower rubber sleeve seat 24, and the lower cone 16 are all clearance-fitted with the lower central tube 23. Therefore, when the lower cone 16 is subjected to an upward thrust, the lower cone 16 and the lower rubber sleeve seat 24 can move upward relative to the lower central tube 23, thereby squeezing the rubber sleeve 15 and completing the sealing of the rubber sleeve 15. In this embodiment, the lower cone 16 is inverted cone-shaped.

[0033] The lower slip 17 is fitted outside the lower center tube 23 and located below the lower cone 16. The switching assembly is also fitted outside the lower center tube 23, with its upper end connected to the lower slip 17. The lower center tube 23 can move up and down relative to the lower slip 17 and the switching assembly. When the center tube moves downward relative to the switching assembly, the lower cone 16 can abut against the lower slip 17, causing the lower slip 17 to expand and lock into the downhole tubing. As the center tube continues to move downward, the lower cone 16 and the lower rubber sleeve seat 24 are continuously subjected to an upward thrust, and the rubber sleeve 15 is squeezed, thereby sealing the downhole tubing.

[0034] Specifically, the switching assembly includes a straightening component and a slotted sleeve 21. The upper end of the straightening component is connected to the lower clamp 17, and its lower end is connected to the slotted sleeve 21. A slide rail 19 is provided on the outer wall of the central tube, and a switching pin 20 is provided on the inner wall of the slotted sleeve 21, which is inserted into the slide rail 19. When the central tube moves relative to the lower clamp 17 and the switching assembly, the switching pin 20 can switch from a first position to a second position on the slide rail 19, thereby unlocking the central tube from the switching assembly.

[0035] like Figure 3 As shown, the slide 19 includes a short slide 192, a long slide 191, and a guide portion 193 formed on the outer wall of the central tube. The short slide 192 and the long slide 191 are distributed circumferentially along the central tube and extend axially along the central tube. The length of the long slide 191 is longer than the length of the short slide 192, and the upper end of the long slide 191 extends upward to the upper end of the short slide 192. The guide portion 193 connects the short slide 192 and the long slide 191. The guide portion 193 is inclined, that is, the upper end of the guide portion 193 is connected to the short slide 192, and its lower end is connected to the long slide 191. The inclined guide portion 193 can guide the switching pin 20 from the short slide 192 to the long slide 191.

[0036] In addition, the straightening assembly includes a spring sleeve 25 whose upper end is connected to the lower slip 17 and whose lower end is connected to the grooved sleeve 21, and several straightening springs 18 circumferentially mounted on the outer wall of the spring sleeve 25. The straightening springs 18 are outwardly bending and expanding elastic sheets. When the tubing bridge plug tool is lowered into the downhole tubing, the straightening springs 18 contact the inner wall of the tubing to straighten the tubing bridge plug tool.

[0037] The lower plug 22 is connected to the lower end of the lower central tube 23 and is used to seal the lower central tube 23.

[0038] An outer sleeve assembly, fitted over the outside of the central tube, is fixed to the upper central tube 5 by a shear pin 26. When the shear pin 26 is sheared, the outer sleeve assembly can move downwards. Specifically, the outer sleeve assembly includes an upper connector 1 and a connecting sleeve 6. The upper connector 1 is connected to the upper end of the upper central tube 5, and the upper end of the connecting sleeve 6 is threadedly connected to the upper connector 1. A locking shaft 4 is also provided on the outside of the central tube, and a locking ring 3 is provided between the locking shaft 4 and the upper connector 1. During installation, the locking shaft 4 is threaded onto the upper end of the upper central tube 5, and the locking ring 3 is threaded into the inner hole of the upper connector 1. Then, the connecting sleeve 6 and the upper connector 1 are sequentially fitted onto the upper central tube 5 and connected together. The connecting sleeve 6 is fixed to the upper central tube 5 by the shear pin 26. Therefore, the upper connector 1 and the connecting sleeve 6 are fixed to the upper central tube 5, and the locking ring 3 is located outside the locking shaft 4. When the upper connector 1 is vibrated by the tool string, the vibration force is transmitted to the connecting sleeve 6, causing the shear pin 26 to be sheared. At this time, the upper connector 1 and the connecting sleeve 6 can move downward relative to the upper central tube 5.

[0039] In addition, such as Figure 2 As shown, the outer surface of the locking shaft 4 is provided with locking shaft teeth 41, and the inner surface of the locking ring 3 is provided with locking ring teeth 31; the locking shaft teeth 41 can mesh with the locking ring teeth 31, and the locking shaft teeth 41 and the locking ring teeth 31 are as follows: Figure 2 As shown by the helical teeth, the upper connector 1 and the connecting sleeve 6 can only move downward along the upper central tube 5, and cannot move upward relative to the upper central tube 5. The upper connector 1 is provided with an upper connector shoulder 27 to limit the downward movement of the outer sleeve assembly. When the upper connector 1 moves downward to a certain position, the upper end of the upper central tube 5 will abut against the upper connector shoulder 27, thereby preventing the outer sleeve assembly from moving further downward.

[0040] The upper connector 1 is provided with a pin hole 2. When in use, the tool string is inserted into the upper connector 1, and the pin is connected to the tool string by passing through the pin hole 2. In this way, the tool string and the upper connector 1 can be connected together.

[0041] The upper slip 7 is fitted outside the upper central tube 5, and its upper end is connected to the connecting sleeve 6. When the upper connector 1 and the connecting sleeve 6 move downward relative to the upper central tube 5, the upper slip 7 can be moved downward. The upper slip 7 and the lower slip 17 are set in opposite directions. Both the upper slip 7 and the lower slip 17 are existing mature technologies, which are commonly used in oil and gas well tools to clamp the inner wall of the tubing after expansion. Their structure and principle will not be described in detail.

[0042] The upper conical assembly is sleeved on the outside of the upper central tube 5 and located below the upper latch 7. Specifically, the upper conical assembly includes: a small locking block 10, a large locking block 11, and an upper conical body 8 with a conical upper end. The upper conical body 8 is sleeved on the upper central tube 5, and its inner wall is provided with a cavity. The outer wall of the upper central tube 5 is provided with a mounting hole. One end of the small locking block 10 is installed in the mounting hole by a spring, and the other end is locked in the cavity. That is, during installation, the spring is first inserted into the mounting hole, then one end of the small locking block 10 is inserted into the mounting hole, and the other end of the small locking block 10 is locked into the cavity of the upper conical body 8, thus fixing the upper conical body 5 and the upper central tube 5 together by the small locking block 10. The outer wall of the central tube is also provided with a keyway 12, and the large locking block 11 is installed in the keyway 12. The upper cone 8 and the upper central tube 5 are in a clearance fit. When the outer sleeve assembly moves the upper slip 7 downward, the upper cone 8 is subjected to a downward thrust, the small locking block 10 is squeezed, the spring contracts, and the small locking block 10 disengages from the cavity of the upper cone 8, allowing the upper cone 8 to move downward. At this time, the large locking block 11 also moves along the keyway 12, thus providing a certain degree of buffering for the upper cone assembly. When the upper cone 8 moves downward against the central tube shoulder 13 at the lower end of the upper central tube 5, the upper cone 8 stops moving downward, and the upper slip 7 expands and clamps the inner wall of the oil pipe due to the compression of the upper cone 8.

[0043] With the above structure, during the process of pushing the tool string carrying the tubing bridge plug tool into the downhole tubing, the switching pin 20 abuts against the uppermost end of the short slide 192, at which point the switching pin 20 is in the first position. When the tubing bridge plug tool is lowered to the set position, the central tube is lifted. Due to the contact between the centralizing spring 18 and the inner wall of the tubing, there is a certain friction between them, as well as the weight of the switching assembly itself. The lower slip 17 and the switching assembly will not move upward with the central tube. At this time, the switching pin 20 moves to the lower end of the short slide 192, and under the guidance of the lifting force and the guide part 193, overcomes the friction between the centralizing spring 18 and the inner wall of the tubing. The lower slip 17 and the switching assembly rotate a certain angle, causing the switching pin 20 to enter the lower end of the long slide 191. Then, the central tube is lowered, and the switching pin 20 moves along the long slide 191 to the top of the long slide 191, as shown below. Figure 3The movement trajectory of the switching pin 20 shown is as follows: During the lowering of the central tube, the lower cone 16 moves downward and squeezes the lower slip 17, causing the lower slip 17 to expand and clamp the inner wall of the tubing. As the central tube continues to move downward, the lower slip 17 exerts an increasing upward thrust on the lower cone 16 and the lower rubber sleeve seat 24, causing the rubber sleeve 15 to expand and seal the tubing, achieving a seat seal. After both the lower slip 17 and the rubber sleeve 15 have expanded, the upper connector 1 is continuously vibrated by the tool string, shearing the pin 26 is cut off, the tool string is lowered, and the outer sleeve assembly moves the upper slip 7 downward. The upper slip 7 expands due to squeezing the upper cone 8 and clamps the inner wall of the tubing. Due to the meshing action of the locking shaft 4 and the locking ring 3, the downhole pressure can be prevented from pushing the outer sleeve assembly upward, thus the upper slip 7 can remain clamped. After the seat seal is completed, the tool string is vibrated or rotated to cut off the pin between the tool string and the upper connector 1, and the tool string can be removed.

[0044] This embodiment adopts a bidirectional anchoring structure, which can withstand bidirectional pressure difference and improve the sealing effect.

[0045] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0046] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A tool for inserting an oil pipe bridge plug, characterized in that, include: Central tube; The upper conical assembly is sleeved on the outside of the central tube; The upper slip (7) is fitted on the outside of the central tube and is located above the upper cone assembly; The outer sleeve assembly is fitted on the outside of the central tube, and its lower end is connected to the upper slip (7). The outer sleeve assembly is fixed to the central tube by a shear pin (26). When the shear pin (26) is cut off, the outer sleeve assembly can push the upper slip (7) downward so that the upper slip (7) abuts against the upper cone assembly to complete the expansion. The rubber sleeve assembly is sleeved on the outside of the central tube, with its upper end fixed to the central tube and its lower end able to move axially relative to the central tube. The lower slip (17) is fitted on the outside of the central tube and is located below the rubber sleeve assembly; The switching assembly is sleeved on the outside of the central tube, and its upper end is connected to the lower slip (17); the central tube can move up and down relative to the switching assembly. When the central tube moves down relative to the switching assembly, the rubber sleeve assembly can abut against the lower slip (17) to expand the lower slip (17) and seal the rubber sleeve assembly. The lower plug (22) is connected to the lower end of the central tube and is used to seal the central tube.

2. The oil pipe bridge plug tool according to claim 1, characterized in that, The outer sleeve assembly includes an upper connector (1) and a connecting sleeve (6); the upper end of the connecting sleeve (6) is threaded to the upper connector (1), and its lower end is connected to the upper clamp (7); the connecting sleeve (6) is fixed to the central tube by the shear pin (26).

3. The oil pipe bridge plug tool according to claim 2, characterized in that, A locking shaft (4) is also provided on the outside of the central tube, and a locking ring (3) is provided between the locking shaft (4) and the upper connector (1); the outer surface of the locking shaft (4) is provided with locking shaft teeth (41), and the inner surface of the locking ring (3) is provided with locking ring teeth (31); the locking shaft teeth (41) can mesh with the locking ring teeth (31) so that the outer sleeve assembly can only move downward along the central tube, and the upper connector (1) is provided with an upper connector shoulder (27) for limiting the downward movement of the outer sleeve assembly.

4. The oil pipe bridge plug tool according to claim 1, characterized in that, The upper cone assembly includes: a small locking block (10), a large locking block (11), and an upper cone (8) with a cone-shaped upper end; the inner wall of the upper cone (8) is provided with a cavity, the outer wall of the central tube is provided with a mounting hole, one end of the small locking block (10) is installed in the mounting hole by a spring, and the other end is stuck in the cavity; the outer wall of the central tube is also provided with a keyway (12), the large locking block (11) is installed in the keyway (12), and the upper cone (8) and the central tube are in clearance fit.

5. The oil pipe bridge plug tool according to claim 1, characterized in that, The glue tube assembly includes an upper glue tube seat (14), a glue tube (15), a lower glue tube seat (24), and a lower cone (16) that are sleeved on the outside of the central tube and connected in sequence; the upper glue tube seat (14) is fixedly connected to the central tube, and the glue tube (15), the lower glue tube seat (24), and the lower cone (16) are all clearance fits with the central tube; the lower cone (16) is inverted cone shape.

6. The oil pipe bridge plug tool according to claim 1, characterized in that, The switching assembly includes a straightening assembly and a slotted sleeve (21); the upper end of the straightening assembly is connected to the lower clamp (17), and the lower end is connected to the slotted sleeve (21); the outer wall of the central tube is provided with a slide (19), and the inner wall of the slotted sleeve (21) is provided with a switching pin (20) inserted into the slide (19); the switching pin (20) can switch from the first position of the slide (19) to the second position so as to unlock the central tube and the switching assembly.

7. The oil pipe bridge plug tool according to claim 6, characterized in that, The slide (19) includes a short slide (192), a long slide (191), and a guide (193) formed on the outer wall of the central tube; the short slide (192) and the long slide (191) are distributed circumferentially along the central tube and extend axially along the central tube; the guide (193) connects the short slide (192) and the long slide (191) and is used to guide the switching pin (20) from the short slide (192) to the long slide (191).

8. The oil pipe bridge plug tool according to claim 6, characterized in that, The straightening assembly includes a spring sleeve (25) whose upper end is connected to the lower clamp (17) and whose lower end is connected to the groove sleeve (21), and several straightening springs (18) circumferentially installed on the outer wall of the spring sleeve (25).

9. The oil pipe bridge plug tool according to claim 5, characterized in that, The central tube includes an upper central tube (5) and a lower central tube (23); the upper central tube (5) is connected to the upper end of the upper glue tube seat (14), and the lower central tube (23) is connected to the lower end of the upper glue tube seat (14).

10. The oil pipe bridge plug tool according to claim 2, characterized in that, The upper connector (1) is provided with a pin hole (2).

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