Releasing tool for blocking oil pipe leakage point above section hoop by means of oil pipe section hoop

Abstract

The utility model provides a releasing tool for blocking an oil pipe leakage point above an oil pipe joint hoop by means of an oil pipe joint hoop, which comprises a central pipe, an isolation pipe nested on the outer side of the central pipe, the central pipe and the isolation pipe are in limit connection through a pin, a sleeve nested on the outer side of the isolation pipe, the sleeve and the isolation pipe are in sliding connection, and an upper rubber sleeve and a lower rubber sleeve are respectively arranged on the sleeve. A limiting protrusion is arranged on the central tube, the limiting protrusion is matched with a setting and releasing limiting rail arranged on the isolation tube, a protective sleeve is arranged at the end of the lower portion of the isolation tube, a positioning claw is arranged in a cavity formed by the protective sleeve and the central tube, and a horn mouth is arranged at the end of the lower portion of the central tube. The device has the advantages of being suitable for throwing and fishing in steel wire operation, simple and compact in overall mechanical structure, low in cost, simple in operation procedure and easy to operate. The whole structure adopts a screw thread connection mode to adjust the plugging distance, and compared with a plugging releasing tool in the prior art, the plugging releasing tool has better adaptability and can be used according to various different conditions.

Description

Technical Field

[0001] The utility model relates to the field of petroleum engineering, and more specifically to a throw-away tool which relies on an oil pipe joint hoop to seal a leaking point of an oil pipe above the joint hoop. Background Art

[0002] The oil pipe is an important equipment for connecting the oil layer and the ground during the development of oil and gas. The standard length of a single oil pipe is about 10m, and the oil pipes are connected with oil pipe joints. During the development of oil and gas layers, if the oil pipe used in the wellbore leaks, it will cause serious production accidents such as blowouts and shutdowns. Once a leak in the oil pipe is found, the leaking point of the oil pipe must be plugged immediately. If the plugging is unsuccessful, the existing oil pipe in the wellbore can only be pulled out and the leaking oil pipe replaced. Compared with the moving pipe string operation, inserting a hand-dropping tool into the oil pipe to plug the leaking point is an efficient treatment measure.

[0003] The existing oil pipe leak plugging tool includes a pair of cable bridge plugs and several isolation tubes for intermediate connection. The operation process is relatively complicated, the operation time is long, the cost is high, and the minimum internal diameter of the tool is too small, which affects subsequent testing and other operations. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and provides a throw-away tool which relies on the oil pipe joint hoop to seal the oil pipe leakage point above the joint hoop.

[0005] The purpose of the utility model is achieved through the following technical solutions.

[0006] A throw-away tool that relies on an oil pipe joint hoop to seal the oil pipe leakage point above the joint hoop, includes a center pipe, an isolation pipe is nested on the outside of the center pipe, the center pipe and the isolation pipe are limitedly connected by a pin, a sleeve is nested on the outside of the isolation pipe, the sleeve and the isolation pipe are slidably connected, an upper rubber sleeve and a lower rubber sleeve are respectively provided on the sleeve, a limiting protrusion is provided on the center pipe, the limiting protrusion matches the seat seal and release limiting track set on the isolation pipe, a sheath is provided on the end of the lower part of the isolation pipe, a positioning claw is provided in the cavity formed by the sheath and the center pipe, and a bell mouth is provided on the end of the lower part of the center pipe.

[0007] The central tube comprises an upper central tube, a middle central tube and a lower central tube, and the upper central tube, the middle central tube and the lower central tube are fixedly connected in sequence from top to bottom by threads.

[0008] The isolation tube comprises an upper isolation tube, a middle isolation tube and a lower isolation tube, which are connected sequentially from top to bottom by threads, a salvage neck is provided at the top of the upper isolation tube, a groove is provided at the middle and lower part of the upper isolation tube, and the upper isolation tube is connected to the upper center tube by a pin limiter.

[0009] An upper sleeve and a middle sleeve are nested on the outside of the isolation tube. The top end of the upper sleeve matches the limiting structure at the top end of the center tube, and the bottom end of the middle sleeve matches the limiting structure at the bottom end of the isolation tube. The upper sleeve and the middle sleeve are fixedly connected, and an upper rubber sleeve and a lower rubber sleeve are respectively provided on the upper sleeve and the middle sleeve.

[0010] The upper sleeve, the upper rubber sleeve, the middle sleeve and the lower rubber sleeve are fixedly connected end to end in sequence from top to bottom.

[0011] A lower sleeve is nested on the outer side of the bell mouth.

[0012] The end of the lower sleeve is of a tapered structure.

[0013] The limiting protrusion is a cylindrical structure.

[0014] The unfolding structure of the seat seal release limit track is a W-shaped track structure.

[0015] The beneficial effects of the utility model are:

[0016] This solution is suitable for wireline operation. The overall mechanical structure is simple, compact and low-cost. Its operation procedure is simple and easy to operate, which is convenient for construction personnel to carry out on-site operations. The overall structure adopts a threaded connection method to adjust the plugging spacing. Compared with the plugging and throwing tools in the prior art, it has better adaptability and can be used for various different situations. It also has a large internal diameter, which is conducive to later testing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a seat seal diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of radial expansion of the seal release limit track;

[0020] In the figure: 1. upper isolating tube; 2. pin; 3. upper sleeve; 4. seat seal and release limit track; 5. upper rubber cylinder; 6. upper center tube; 7. middle sleeve; 8. middle isolating tube; 9. middle center tube; 10. lower center tube; 11. lower isolating tube; 12. lower rubber cylinder; 13. positioning claw; 14. sheath; 15. lower sleeve; 16. bell mouth. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below through specific embodiments.

[0022] Example

[0023] A throw-away tool that relies on an oil pipe joint hoop to seal the oil pipe leakage point above the joint hoop, includes a center pipe, an isolation pipe is nested on the outside of the center pipe, the center pipe and the isolation pipe are limitedly connected by a pin 2, a sleeve is nested on the outside of the isolation pipe, the sleeve and the isolation pipe are slidably connected, an upper rubber sleeve 5 and a lower rubber sleeve 12 are respectively provided on the sleeve, a limiting protrusion is provided on the center pipe, the limiting protrusion matches the seat seal and release limiting track 4 set on the isolation pipe, a sheath 14 is provided on the end of the lower part of the isolation pipe, a positioning claw 13 is provided in the cavity formed by the sheath 14 and the center pipe, and a bell mouth 16 is provided on the end of the lower part of the center pipe.

[0024] The central tube comprises an upper central tube 6, a middle central tube 9 and a lower central tube 10, and the upper central tube 6, the middle central tube 9 and the lower central tube 10 are fixedly connected in sequence from top to bottom by threads.

[0025] The isolation tube includes an upper isolation tube 1, a middle isolation tube 8 and a lower isolation tube 11. The upper isolation tube 1, the middle isolation tube 8 and the lower isolation tube 11 are connected in sequence from top to bottom by threads. A salvage neck is provided at the top of the upper isolation tube 1, a groove is provided in the middle and lower part of the upper isolation tube 1, and the upper isolation tube 1 is connected to the upper center tube 6 by a pin 2.

[0026] An upper sleeve 3 and a middle sleeve 7 are nested on the outside of the isolation tube. The top end of the upper sleeve 3 matches the limiting structure at the top end of the center tube, and the bottom end of the middle sleeve 7 matches the limiting structure at the bottom end of the isolation tube. The upper sleeve 3 and the middle sleeve 7 are fixedly connected, and an upper rubber sleeve 5 and a lower rubber sleeve 12 are respectively provided on the upper sleeve 3 and the middle sleeve 7.

[0027] The upper sleeve 3, the upper rubber sleeve 5, the middle sleeve 7 and the lower rubber sleeve 12 are fixedly connected end to end in sequence from top to bottom.

[0028] A lower sleeve 15 is nested outside the bell mouth 16 .

[0029] The end of the lower sleeve 15 is in a tapered structure.

[0030] The limiting protrusion is a cylindrical structure.

[0031] The unfolded structure of the sealing and releasing limiting track 4 is a W-shaped track structure.

[0032] The working principle of the utility model is as follows: Figure 1 As shown, a hand-release tool that relies on a tubing joint hoop to seal the leaking point of the tubing above the joint hoop has a positioning claw 13 completely received in a sheath 14 before entering the well, and a pin 2 is provided to connect the upper isolation pipe 1 and the upper center pipe 6 as a whole.

[0033] When sealing is required, the tool string is quickly lowered and stopped below the target tubing joint. The claw piece at the lower end of the positioning claw 13 is thrown out from the sheath 14. Under the elastic action of the claw arm of the positioning claw 13, the claw piece is fully opened and closely attached to the inner wall of the tubing. Lift the tool string, when the claw of the positioning claw 13 approaches the gap between the oil pipe joints in the joint hoop, the claw is inserted into the oil pipe joint; continue to lift the tool string, because the claw is stuck on the upper edge of the oil pipe joint, the tool string is stuck; shock the tool string downward to cut the pin 2; continue to lift the tool string, when the pulling force reaches the design value, the center pipe does not move, and the lower sheath 14 moves upward driven by the isolation pipe, and under the joint action of the upper center pipe 6 and the isolation pipe, the upper rubber cylinder 5 and the lower rubber cylinder 12 are compressed to seal the annular space between the oil pipe and the isolation pipe; when the lifting pulling force exceeds the design value, the limiting protrusion on the upper center pipe reaches the lower dead point; loosen the steel wire, and under the elastic action of the upper rubber cylinder 5 and the lower rubber cylinder 12 themselves, the limiting protrusion on the upper center pipe 6 moves upward to the locking point to prevent the upper rubber cylinder 5 and the lower rubber cylinder 12 from releasing the seal and the center pipe from moving downward.

[0034] Furthermore, the central tube and the isolation tube are a three-section structure connected by threads for adjusting the plugging distance.

[0035] like Figure 2 As shown, when it is necessary to release the seal, lift the tool string, and when the pulling force reaches the designed value, the limiting protrusion on the upper center tube 6 reaches the bottom dead point, and then gradually relax the steel wire. The limiting protrusion on the upper center tube 6 moves up from the bottom dead point under the action of the elasticity of the upper rubber cylinder 5 and the lower rubber cylinder 12, so that the isolation tube moves down and the rubber cylinder releases the seal; jar the tool string downward, and the claw piece of the positioning claw 13 is stored in the sheath 14, and the claw piece is detached from the joint hoop, and the entire hand-release tool can automatically move in the oil pipe.

[0036] like Figure 3 As shown, during the sealing and releasing work, the limiting movement of the upper isolation tube 1 relative to the upper center tube 6 is achieved by the limiting protrusions arranged on the upper center tube 6 moving within the sealing and releasing limiting track 4 arranged on the upper isolation tube 1, and the limiting protrusions move along the sealing and releasing limiting track 4 to achieve the limiting movement.

[0037] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A throw-away tool that relies on a tubing joint hoop to seal the leaking point of the tubing above the joint hoop, characterized in that: It includes a central tube, an isolation tube is nested on the outer side of the central tube, the central tube and the isolation tube are limitedly connected by a pin, a sleeve is nested on the outer side of the isolation tube, the sleeve is slidably connected to the isolation tube, an upper rubber tube and a lower rubber tube are respectively provided on the sleeve, a limiting protrusion is provided on the central tube, the limiting protrusion matches the seat seal and release limiting track arranged on the isolation tube, a sheath is provided on the end part of the lower part of the isolation tube, a positioning claw is provided in the cavity formed by the sheath and the central tube, and a bell mouth is provided on the end part of the lower part of the central tube.

2. A throw-away tool for plugging the leaking point of the oil pipe above the oil pipe joint hoop according to claim 1, characterized in that: The central tube comprises an upper central tube, a middle central tube and a lower central tube, and the upper central tube, the middle central tube and the lower central tube are fixedly connected in sequence from top to bottom by threads.

3. The throw-away tool according to claim 2, which relies on the tubing joint hoop to seal the leaking point of the tubing above the joint hoop, is characterized by: The isolation tube comprises an upper isolation tube, a middle isolation tube and a lower isolation tube, which are connected sequentially from top to bottom by threads, a salvage neck is provided at the top of the upper isolation tube, a groove is provided at the middle and lower part of the upper isolation tube, and the upper isolation tube is connected to the upper center tube by a pin limiter.

4. A throw-away tool for plugging the leaking point of the oil pipe above the oil pipe joint hoop by relying on the oil pipe joint hoop according to claim 3, characterized in that: An upper sleeve and a middle sleeve are nested on the outside of the isolation tube. The top end of the upper sleeve matches the limiting structure at the top end of the center tube, and the bottom end of the middle sleeve matches the limiting structure at the bottom end of the isolation tube. The upper sleeve and the middle sleeve are fixedly connected, and an upper rubber sleeve and a lower rubber sleeve are respectively provided on the upper sleeve and the middle sleeve.

5. The throw-away tool according to claim 4, which relies on the tubing joint hoop to seal the leaking point of the tubing above the joint hoop, is characterized in that: The upper sleeve, the upper rubber sleeve, the middle sleeve and the lower rubber sleeve are fixedly connected end to end in sequence from top to bottom.

6. The throw-away tool according to claim 1, which relies on the tubing joint hoop to seal the leaking point of the tubing above the joint hoop, is characterized by: A lower sleeve is nested on the outer side of the bell mouth.

7. A throw-away tool for plugging the leaking point of the oil pipe above the oil pipe joint hoop by relying on the oil pipe joint hoop according to claim 6, characterized in that: The end of the lower sleeve is of a tapered structure.

8. The throw-away tool according to claim 1, which relies on the tubing joint hoop to seal the leaking point of the tubing above the joint hoop, is characterized by: The limiting protrusion is a cylindrical structure.

9. The throw-away tool according to claim 1, which relies on the tubing joint hoop to seal the leaking point of the tubing above the joint hoop, is characterized by: The unfolding structure of the seat seal release limit track is a W-shaped track structure.

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