Releasing tool for blocking oil pipe leakage point at joint hoop through oil pipe joint hoop

Abstract

The utility model provides a releasing tool for blocking an oil pipe leakage point at a joint hoop through an oil pipe joint hoop, which belongs to the field of petroleum engineering and comprises a central pipe, an isolating pipe, a setting mechanism and a positioning mechanism, the central pipe is arranged inside the isolating pipe, the setting mechanism and the positioning mechanism are arranged outside the isolating pipe, and meanwhile, a fishing neck is mounted at the upper end of the isolating pipe; the positioning mechanism comprises a sheath and a positioning claw, the upper end of the sheath is in threaded connection with the isolation pipe, and the positioning claw is placed in the sheath; the setting mechanism comprises an upper sleeve, a middle sleeve, a lower sleeve, an upper rubber sleeve, a lower rubber sleeve and a horn mouth; the three sleeves and the two rubber sleeves are all arranged outside the isolation pipe in a sleeving mode, meanwhile, the upper sleeve and the upper rubber sleeve are arranged above the protective sleeve, the middle sleeve, the lower rubber sleeve and the lower sleeve are arranged below the protective sleeve, the upper end of the horn mouth is in threaded connection with the center pipe, and meanwhile the upper end of the horn mouth is attached to the lower end of the lower sleeve. The oil pipe leakage point plugging operation efficiency is improved, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of petroleum engineering, in particular to a throw-away tool which relies on an oil pipe joint hoop to seal a leaking point of an oil pipe at a 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 and releasing tool includes a pair of cable bridge plugs and several isolation tubes for intermediate connection. It is a split design. When in use, each part needs to be dropped into the well in sequence and connected in the well, which makes the operation process more complicated and takes a long time. At the same time, the sealing mechanism in the existing releasing tool is a pair of small-diameter bridge plugs, which have a complex structure and high manufacturing cost, resulting in high operation cost. In addition, the main function of the existing releasing tool is plugging, and the inner diameter is too small, while the minimum outer diameter of the existing wire operation tool is generally larger than the inner diameter of the existing releasing tool. Therefore, the excessively small inner diameter makes subsequent operations basically impossible, thereby affecting subsequent testing and other operations. Utility Model Content

[0004] In view of this, the utility model aims to provide a low-cost, high-efficiency, mechanical throw-away tool that relies on a tubing joint clamp to seal the tubing leak at the joint clamp, thereby improving the efficiency of tubing leak sealing operations and reducing operating costs.

[0005] To achieve the above purpose, the technical solution of the utility model is implemented as follows: a hand-release tool that relies on a tubing joint hoop to seal a tubing leak at a joint hoop, comprising a center tube, an isolation tube, a sealing mechanism and a positioning mechanism, wherein the isolation tube is provided with a center tube inside, a sealing mechanism and a positioning mechanism outside, and a fishing neck is installed at the upper end of the isolation tube;

[0006] The positioning mechanism includes a sheath and a positioning claw. The upper end of the sheath is threadedly connected to the isolation tube, and a cavity is formed between the inner wall of the sheath and the outer wall of the isolation tube. The positioning claw is placed in the cavity.

[0007] The sealing mechanism includes an upper sleeve, a middle sleeve, a lower sleeve, an upper rubber cylinder, a lower rubber cylinder and a bell mouth; the upper sleeve, the middle sleeve, the lower sleeve and the upper rubber cylinder and the lower rubber cylinder are all sleeved on the outside of the isolation tube, and the upper sleeve and the upper rubber cylinder are arranged above the sleeve, and the middle sleeve, the lower rubber cylinder and the lower sleeve are arranged below the sleeve, the upper end of the bell mouth is threadedly connected to the center pipe, and the upper end of the bell mouth is fitted with the lower end of the lower sleeve.

[0008] Furthermore, two cylindrical protrusion structures are provided at the upper end of the central tube, and the two protrusion structures are symmetrically arranged along the central axis of the central tube; a track structure is opened at the upper end of the isolation tube, and the protrusion structure can move along the track structure under the action of external force.

[0009] Furthermore, a claw piece is provided at the lower end of the positioning claw. When the hand-throwing tool is in the initial state, the positioning claw is compressed in the sheath due to the elasticity of the claw piece.

[0010] Furthermore, the upper end of the middle sleeve is a conical structure.

[0011] Furthermore, the interior of the central tube is a constant diameter structure.

[0012] Furthermore, the upper rubber cylinder and the lower rubber cylinder can respectively move axially along the outside of the isolation tube. At the same time, the upper rubber cylinder and the lower rubber cylinder can both be deformed when subjected to force, and the outer walls bulge outwards.

[0013] Furthermore, the track structure is a groove-shaped structure.

[0014] Compared with the prior art, the hand-dropping tool described in the utility model that relies on the oil pipe joint hoop to seal the oil pipe leakage point at the joint hoop has the following advantages:

[0015] (1) The mechanical structure of the hand-dropping tool of the utility model is simple, compact and low in cost. The tool can be positioned and sealed in one trip down the well by using a steel wire. Therefore, the operation cost is low.

[0016] (2) The hand-dropping tool described in the utility model uses a steel wire to cast and fish, and the tool positioning and sealing can be completed in one trip down the well. The operation procedure is simple and easy to operate;

[0017] (3) The central tube of the hand-dropping tool of the present invention has a large inner diameter, which is beneficial for later operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the hand-throwing tool according to an embodiment of the utility model;

[0020] Figure 2 This is a sealing diagram of the hand-throwing tool described in the embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the expansion of the track structure part provided on the upper end of the isolation tube in the embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1. Salvage neck; 2. Isolation tube; 21. Track structure; 211. Bottom dead center; 212. Locking point; 3. Center tube; 31. Protruding structure; 4. Upper sleeve; 5. Upper rubber cylinder; 6. Sheath; 7. Positioning claw; 71. Claw piece; 8. Middle sleeve; 9. Lower rubber cylinder; 10. Lower sleeve; 11. Bell mouth. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] like Figure 1-Figure 3As shown, the utility model is a throw-away tool that relies on a tubing joint to seal a leak at a tubing joint, comprising a center tube 3, an isolation tube 2, a sealing mechanism and a positioning mechanism. The isolation tube 2 is provided with a center tube 3 inside, and the center tube 3 has a constant diameter structure. In actual applications, its inner diameter is larger than the outer diameter of commonly used existing wire working tools, and sufficient channels can be reserved for subsequent operations. At the same time, two cylindrical protrusion structures 31 are provided at the upper end of the center pipe 3, and the two protrusion structures 31 are symmetrically arranged along the central axis of the center pipe 3. A groove-shaped track structure 21 is opened at the upper end of the isolation pipe 2, which is the track for the protrusion structure 31 at the upper end of the center pipe 3 to be installed, sealed, locked, and unsealed in the isolation pipe 2. Under the action of external force, the protrusion structure 31 can move along the track structure 21, and the track structure 21 is provided with a bottom dead point 211 and a locking point 212. When the protrusion structure 31 of the center pipe 3 reaches the bottom dead point 211, the upper rubber cylinder 5 and the lower rubber cylinder 9 used for sealing are compressed to the maximum value; when the protrusion structure 31 of the center pipe 3 reaches the locking point 212, the sleeve that pushes the rubber cylinder no longer moves, and the two rubber cylinders seal the annulus between the hand-release tool and the inner wall of the oil pipe. In the description of the present invention, it should be understood that the terms "center", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] The track structure 21 on the isolation tube 2 is also the track for sealing and unsealing the hand-dropping tool. The hand-dropping tool can be sealed and unsealed by pulling up the isolation tube 2. The outside of the isolation tube 2 is provided with a sealing mechanism and a positioning mechanism. At the same time, a salvage neck 1 is installed at the upper end of the isolation tube 2. Preferably, the salvage neck 1 is threadedly connected to the isolation tube 2. A salvage tool such as a GS used for wire operation can be inserted into the upper part of the salvage neck 1 and cooperate with the step inside the salvage neck 1 to hang the hand-dropping tool at the lower end of the salvage tool, thereby dropping the hand-dropping tool into the well. Since the hand-dropping tool is sent to the well by the wire salvage tool, the steel wire here is a working medium, shaped like an iron wire. The lower end of the steel wire is connected to a salvage tool such as a GS, and the lower end of the GS is hung with the hand-dropping tool. By retracting and releasing the steel wire, the hand-dropping tool can be moved up or down in the wellbore.

[0028] The positioning mechanism includes a sheath 6 and a positioning claw 7; the upper end of the sheath 6 is threadedly connected to the isolation tube 2, and a cavity is formed between the inner wall thereof and the outer wall of the isolation tube 2, in which the positioning claw 7 is placed, and a claw piece 71 is provided at the lower end of the positioning claw 7. When the hand-throwing tool is in the initial state, the positioning claw 7 relies on the elasticity of the claw piece 71 and is in a state of being compressed in the sheath 6.

[0029] The sealing mechanism includes three sleeves, two rubber sleeves and a bell mouth 11. The three sleeves are respectively an upper sleeve 4, a middle sleeve 8, and a lower sleeve 10. Among them, the upper end of the middle sleeve 8 is a conical structure, which is convenient for cooperating with the positioning mechanism. The three sleeves can move axially outside the isolation tube 2. The two rubber sleeves are respectively an upper rubber sleeve 5 and a lower rubber sleeve 9. The upper rubber sleeve 5 and the lower rubber sleeve 9 can move axially outside the isolation tube 2. At the same time, the upper rubber sleeve 5 The upper sleeve 4, the middle sleeve 8, the lower sleeve 10, the upper rubber cylinder 5 and the lower rubber cylinder 9 are all sleeved on the outside of the isolation tube 2, and the upper sleeve 4 and the upper rubber cylinder 5 are arranged above the sheath 6, and the middle sleeve 8, the lower rubber cylinder 9 and the lower sleeve 10 are arranged below the sheath 6. The upper end of the bell mouth 11 is threadedly connected to the center tube 3, and the upper end of the bell mouth 11 is in contact with the lower end of the lower sleeve 10.

[0030] The release tool 7 is then released, and the release claw 71 is released by the upper end of the middle sleeve 8 to release the claw piece 71 from the sleeve 6. Hand tool, when the upper sleeve 4 and the middle sleeve 8 no longer move upward, the upper sleeve 4 compresses the upper rubber cylinder 5, the middle sleeve 8 compresses the lower rubber cylinder 9, the upper rubber cylinder 5 and the lower rubber cylinder 9 are respectively compressed and deformed, and the gap between the hand tool and the inner wall of the oil pipe is blocked; when the wire pulling force exceeds the design value, the convex structure 31 on the top of the center tube 3 pushes the upper sleeve 4 and the lower sleeve 10 to compress the upper rubber cylinder 5 and the lower rubber cylinder 9 to produce the maximum deformation, and the convex structure 31 on the top of the center tube 3 reaches the bottom dead point 211; reduce the wire pulling force, under the elastic action of the upper rubber cylinder 5 and the lower rubber cylinder 9 themselves, the convex structure 31 on the top of the center tube 3 moves up to the locking point 212, preventing the upper rubber cylinder 5 and the lower rubber cylinder 9 from releasing, and at the same time preventing the center tube 3 and the isolation tube 2 from sliding down, ensuring that the two deformed rubber cylinders are respectively sealed on the upper and lower sides of the leak point at the oil pipe joint hoop.

[0031] When it is necessary to release the seal, lift the releasing tool. When the wire pulling force reaches the designed value, the center tube 3 reaches the bottom dead point 211, and then the pulling force is gradually reduced to 0. The raised structure 31 on the center tube 3 slides from the locking point 212 to the releasing position under the elasticity of the upper rubber cylinder 5 and the lower rubber cylinder 9. The center tube 3 moves downward, the rubber cylinder is released, and the raised structure 31 at the upper end of the center tube 3 moves upward from the bottom dead point 211; the releasing tool is shaken downward, and the center tube 3 and the isolation tube 2 move downward; the sheath 6 moves downward, and the claw piece 71 of the positioning claw 7 is gradually compressed and stored in the sheath 6, and the claw piece 71 of the positioning claw 7 is removed from the oil pipe joint clamp. At this time, the entire releasing tool can move freely in the oil pipe.

[0032] This patent has a simple structure, few parts, and low cost. It uses steel wire for casting and catching operations, and the operation can be completed in one trip down the well, so the operation cost is low. At the same time, this patent is an integrated design that integrates the positioning and sealing mechanisms together, and the positioning and sealing can be completed in one trip down the well, so the operation efficiency is high. In addition, this patent does not involve electric, hydraulic, or gunpowder explosions, and the mechanical positioning and sealing functions can be achieved simply by relying on the power provided by the operating steel wire.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A throw-away tool that plugs the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint, characterized in that: It comprises a central tube (3), an isolation tube (2), a sealing mechanism and a positioning mechanism, wherein the central tube (3) is arranged inside the isolation tube (2), the sealing mechanism and the positioning mechanism are arranged outside the isolation tube (2), and a fishing neck (1) is installed at the upper end of the isolation tube (2); The positioning mechanism comprises a sheath (6) and a positioning claw (7); the upper end of the sheath (6) is threadedly connected to the isolation tube (2); a cavity is formed between the inner wall of the sheath and the outer wall of the isolation tube (2); and the positioning claw (7) is placed in the cavity; The sealing mechanism comprises an upper sleeve (4), a middle sleeve (8), a lower sleeve (10), an upper rubber cylinder (5), a lower rubber cylinder (9) and a bell mouth (11); the upper sleeve (4), the middle sleeve (8), the lower sleeve (10) and the upper rubber cylinder (5) and the lower rubber cylinder (9) are all sleeved on the outside of the isolation tube (2), and the upper sleeve (4) and the upper rubber cylinder (5) are arranged above the sheath (6), and the middle sleeve (8), the lower rubber cylinder (9) and the lower sleeve (10) are arranged below the sheath (6); the upper end of the bell mouth (11) is threadedly connected to the center tube (3), and the upper end of the bell mouth (11) is in contact with the lower end of the lower sleeve (10).

2. The throw-away tool for plugging the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint hoop according to claim 1 is characterized in that: The upper end of the central tube (3) is provided with two cylindrical protruding structures (31), and the two protruding structures (31) are symmetrically arranged along the central axis of the central tube (3); the upper end of the isolation tube (2) is provided with a track structure (21), and under the action of external force, the protruding structure (31) can move along the track structure (21).

3. The throw-away tool for plugging the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint hoop according to claim 1 is characterized in that: A claw piece (71) is provided at the lower end of the positioning claw (7). When the hand-throwing tool is in an initial state, the positioning claw (7) is compressed in the sheath (6) due to the elasticity of the claw piece (71).

4. The throw-away tool for plugging the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint hoop according to claim 1 is characterized in that: The upper end of the middle sleeve (8) is a conical structure.

5. The throw-away tool for plugging the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint hoop according to claim 2 is characterized in that: The interior of the central tube (3) is a constant diameter structure.

6. The throw-away tool for plugging the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint hoop according to claim 1 is characterized in that: The upper rubber cylinder (5) and the lower rubber cylinder (9) can respectively move axially along the outside of the isolation tube (2). At the same time, the upper rubber cylinder (5) and the lower rubber cylinder (9) can both deform when subjected to force, and the outer walls bulge outwards.

7. The throw-away tool for plugging the leaking point of the oil pipe at the oil pipe joint by relying on the oil pipe joint hoop according to claim 2 is characterized in that: The track structure (21) is a groove-shaped structure.

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