Releasing tool for blocking leakage point of oil pipe below section hoop through oil pipe section hoop

Abstract

The utility model provides a releasing tool for plugging an oil pipe leakage point below a joint hoop by an oil pipe joint hoop, which comprises an upper central pipe, a sheath fixedly nested on the outer side of the upper central pipe, a positioning claw arranged in an interlayer between the upper central pipe and the sheath, a pin arranged on the upper central pipe, and a pin limiting rail arranged on the sheath and matched with the pin limiting rail. The lower end of the upper center pipe is connected with a lower center pipe through a middle center pipe, and a setting mechanism is arranged on the outer side of the middle center pipe and the outer side of the lower center pipe. 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, easy to operate and convenient for constructors to conduct field operation. 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. And the inner drift diameter is relatively large, so that the later test operation is facilitated.

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 below the joint hoop. Background Art

[0002] The oil pipe is an important device 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 pipe leak is found, production must be stopped immediately and the leaking point of the pipe must be plugged. If the plugging is unsuccessful, the existing oil pipe in the wellbore can only be pulled out and the leaking oil pipe must be 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 below 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 below the joint hoop, comprises an upper center pipe, a sleeve is nested and fixed on the outer side of the upper center pipe, a positioning claw is provided in the interlayer between the upper center pipe and the sleeve, a pin is provided on the positioning claw, the pin is matched with a pin limiting track provided on the sleeve, the lower end of the upper center pipe is connected through a middle center pipe and a lower center pipe, and a sealing mechanism is provided on the outer sides of the middle center pipe and the lower center pipe.

[0007] The sealing mechanism comprises an upper sleeve, a middle sleeve, an upper sealing rubber tube, a lower sealing rubber tube and a bell mouth. The upper sleeve, the upper sealing rubber tube, the middle sleeve and the lower sealing rubber tube are fixedly connected in sequence to form a sleeve structure. The bell mouth is fixedly connected to the end of the lower center tube, and the outer side wall of the bell mouth is matched and limited with the bottom end of the lower sealing rubber tube.

[0008] The top end of the upper sleeve is in a conical structure, and the conical structure of the top end of the upper sleeve matches the positioning claw.

[0009] The upper central tube, the middle central tube and the lower central tube are connected to each other via threads.

[0010] A fishing neck structure is provided on the upper central pipe.

[0011] The pin limiting track is unfolded to present a W-shaped structure.

[0012] The beneficial effects of the utility model are:

[0013] 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

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 Schematic diagram of the seat seal in the embodiment;

[0016] Figure 3 is the radial development diagram of the sheath;

[0017] In the figure: 1. upper center tube; 2. sleeve; 3. positioning claw; 4. pin; 5. upper sleeve; 6. upper sealing rubber tube; 7. middle sleeve; 8. middle center tube; 9. lower center tube; 10. lower sealing rubber tube; 11. bell mouth; 12. pin limit track. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below through specific embodiments.

[0019] Example

[0020] A throw-away tool that relies on an oil pipe joint hoop to seal the oil pipe leakage point below the joint hoop, comprises an upper center pipe 1, a sleeve 2 is nested and fixed on the outer side of the upper center pipe 1, a positioning claw 3 is provided in the interlayer between the upper center pipe 1 and the sleeve 2, a pin 4 is provided on the positioning claw 3, the pin 4 is matched with a pin limiting track 12 provided on the sleeve 2, the lower end of the upper center pipe 1 is connected through a middle center pipe 8 and a lower center pipe 9, and a sealing mechanism is provided on the outer sides of the middle center pipe 8 and the lower center pipe 9.

[0021] The sealing mechanism includes an upper sleeve 5, a middle sleeve 7, an upper sealing rubber tube 6, a lower sealing rubber tube 10 and a bell mouth 11. The upper sleeve 5, the upper sealing rubber tube 6, the middle sleeve 7 and the lower sealing rubber tube 10 are fixedly connected in sequence to form a sleeve structure. The bell mouth 11 is fixedly connected to the end of the lower center tube 9, and the outer side wall of the bell mouth 11 matches and limits the bottom end of the lower sealing rubber tube 10.

[0022] The top end of the upper sleeve 5 is in a conical structure, and the conical structure of the top end of the upper sleeve 5 matches the positioning claw 3 .

[0023] The upper central tube 1, the middle central tube 8 and the lower central tube 9 are connected to each other through threads.

[0024] A fishing neck structure is provided on the upper central pipe 1 .

[0025] The pin limiting track 12 is unfolded to present a W-shaped structure.

[0026] The working principle of the utility model is as follows: Figure 1 As shown, the device includes three major parts: a center tube, a positioning mechanism, and a sealing mechanism.

[0027] The central tube includes an upper central tube 1, a middle central tube 8 and a lower central tube 9. The upper central tube 1, the middle central tube 8 and the lower central tube 9 are connected by threads to achieve the function of adjusting the length. During use, they can be used to adjust the sealing spacing and increase the overall adaptability of the device.

[0028] The positioning mechanism includes a sleeve 2, a positioning claw 3 and a pin 4. A cavity is formed between the sleeve 2 and the upper center tube 1 for setting the positioning claw 3. When sealing, the positioning claw 3 is released from the cavity and hooks the tube wall to achieve limiting. At the same time, the pin 4 and the pin limiting track 12 set on the sleeve 2 match the movement to adjust the relative positions of the center tube and the sleeve 2 and the positioning claw 3, so as to squeeze the upper sealing rubber tube 6 and the lower sealing rubber tube 10 for sealing.

[0029] Before entering the well, the positioning claw 3 is completely received in the casing 2, and a pin 4 is provided to connect the positioning claw 3 and the casing 2 as a whole; when a seal is required, the tool string is quickly lowered and stopped urgently below the target tubing joint, and the claw piece at the lower end of the positioning claw 3 is thrown out from the casing 2, and under the elastic action of the claw arm of the positioning claw 3, the claw piece is fully opened and close to the inner wall of the tubing; the tool string is lifted up, and when the claw piece of the positioning claw 3 approaches the gap between the tubing joints in the joint, the claw piece is inserted into the tubing joint; the tool string is continued to be lifted up, because the claw piece is stuck on the upper edge of the tubing joint, the tool string is stuck; the tool string is continued to be lifted up, and when the pulling force reaches the designed value, the upper center pipe 1, the middle center pipe 8, the lower center pipe 9 and the casing 2 move up, and the upper sleeve 5 is stuck in the claw piece, compressing the upper sealing rubber tube 6 and the lower sealing rubber tube 10 to seal the annular space between the tubing and the center pipe;

[0030] like Figure 3 As shown, when the upward pulling force exceeds the design value, the pin 4 reaches the bottom dead center; the steel wire is loosened, and under the elastic effect of the upper sealing rubber tube 6 and the lower sealing rubber tube 10, the pin 4 moves up to the locking point, preventing the upper sealing rubber tube 6 and the lower sealing rubber tube 10 from releasing the seal, and the center tube from moving downward.

[0031] 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 pin 4 reaches the bottom dead point, and then gradually reduce the pulling force to 0. Under the elastic action of the upper sealing rubber tube 6 and the lower sealing rubber tube 10, the center tube moves downward, the rubber tube releases the seal, and the pin 4 moves up from the bottom dead point; the tool string is jarred downward, the claw piece of the positioning claw 3 is stored in the sheath 2, and the claw piece is detached from the joint hoop, and the entire hand-release tool can automatically move in the oil pipe.

[0032] 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 below the joint hoop, characterized in that: It includes an upper center tube, a sleeve is nested and fixed on the outer side of the upper center tube, a positioning claw is provided in the interlayer between the upper center tube and the sleeve, a pin is provided on the positioning claw, the pin is matched with the pin limiting track provided on the sleeve, the lower end of the upper center tube is connected through the middle center tube and the lower center tube, and a sealing mechanism is provided on the outer side of the middle center tube and the lower center tube.

2. A throw-away tool for plugging the leaking point of the oil pipe below the oil pipe joint hoop according to claim 1, characterized in that: The sealing mechanism comprises an upper sleeve, a middle sleeve, an upper sealing rubber tube, a lower sealing rubber tube and a bell mouth. The upper sleeve, the upper sealing rubber tube, the middle sleeve and the lower sealing rubber tube are fixedly connected in sequence to form a sleeve structure. The bell mouth is fixedly connected to the end of the lower center tube, and the outer side wall of the bell mouth is matched and limited with the bottom end of the lower sealing rubber tube.

3. A throw-away tool for plugging the leaking point of the oil pipe below the oil pipe joint hoop according to claim 2, characterized in that: The top end of the upper sleeve is in a conical structure, and the conical structure of the top end of the upper sleeve matches the positioning claw.

4. The throw-away tool according to claim 1, which relies on the tubing joint to seal the leaking point of the tubing below the joint, is characterized in that: The upper central tube, the middle central tube and the lower central tube are connected to each other via threads.

5. The throw-away tool according to claim 1, which relies on the tubing joint to seal the leaking point of the tubing below the joint, is characterized in that: A fishing neck structure is provided on the upper central pipe.

6. The throw-away tool according to claim 1, which relies on the tubing joint to seal the leaking point of the tubing below the joint, is characterized in that: The pin limiting track is unfolded to present a W-shaped structure.

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