Rotary releasing tool

Abstract

The utility model relates to a rotary type releasing tool which comprises a fishing neck, a barrel, a spring, a pin, a sliding block, a lower connector, a cylindrical pin, a screw and a shear pin, the lower connector, the sliding block and the spring are installed in the barrel, the fishing neck is connected to one end of the barrel, the pin is installed on the sliding block, and the shear pin is installed on the lower connector. The cylindrical pin is installed on the lower connector, screws are installed on the sliding block and the lower connector, and the shear pin is installed at the end, away from the fishing neck, of the lower connector. The two J-shaped grooves in mirror image relation are formed in the cylinder body, so that the purpose of mechanically rotating and releasing the tool in the using process is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield well repair construction and downhole tools, in particular to a rotary hand-dropping tool. Background Art

[0002] At present, there are three main types of hand release tools in China, namely reverse hand release, hydraulic hand release and mechanical hand release. The hand release method is single, and once the hand release fails, there is a risk of not being able to release the hand.

[0003] In the existing technology, such as the Chinese utility model patent with publication number CN2546623Y, it discloses a pressure-limited release device, which is used in the field of oil well water plugging and connected to the oil well water plugging release pipe column. It is mainly composed of an upper joint 1, a spring claw 2, a main body 3, a pin 4, a sliding sleeve 5 and a lower joint 8. It is mainly used to overcome the need for a special ball or impact rod in the current release method, thereby extending the operation time. The utility model directly implements the release through hydraulic pressure, simplifies the release operation process, shortens the operation time, and has a set pressure-limiting function, which plays a role in protecting the packer rubber cylinder.

[0004] Another example is the Chinese utility model patent with publication number CN2545353Y, which discloses a tool for oil field downhole. The lower joint (1) is connected to the lower end of the piston sleeve (2), the piston (6) is arranged in the annular space (12) formed by the piston sleeve and the lower joint, and the piston and the lower joint are connected by a pin (3); the upper joint (11) is arranged in the lower joint, the lower end of the upper joint is connected to the lower joint by a locking block (4), the locking block is located above the pin, a convex sleeve (13) is provided on the upper end of the piston sleeve and the step surface (1-1) of the lower joint, a pressure cap (10) is provided on the upper end of the convex sleeve and the outer cylindrical surface of the lower joint, and a sealing rubber sleeve (9) is provided on the outer cylindrical surface of the convex sleeve and the pressure cap. The utility model solves the problem that the water plugging pipe column is easily buried in sand in fracturing wells and wells prone to sand production, making it difficult to start the water plugging pipe column next time.

[0005] The above-mentioned existing technical solutions have the following defects: the mechanical release function of the release tool in the existing cases adopts the "reverse buckle" method in part and the "direct downward pressure" method in part. The "reverse buckle" method cannot rotate the pipe string forward when lowering, which greatly increases the difficulty of lowering the pipe string and prolongs the time of lowering the pipe string; the "direct downward pressure" method is easy to conflict with "obstruction" after the pipe string is lowered into the horizontal section, making it difficult to judge the downhole conditions on the ground, difficult to operate, and easy to cause premature release, which limits the use of such tools in horizontal wells. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a rotary release tool, which achieves the purpose of mechanically rotating the tool during use by arranging two J-shaped grooves in a mirror relationship on the barrel.

[0007] The above utility model object of the utility model is achieved through the following technical solutions:

[0008] A rotary hand-dropping tool comprises a fishing neck, a cylinder, a spring, a pin, a slider, a lower joint, a cylindrical pin, a screw and a shear pin, wherein the lower joint, the slider and the spring are installed in the cylinder, the fishing neck is connected to one end of the cylinder, the pin is installed on the slider, the cylindrical pin is installed on the lower joint, the slider and the lower joint are both installed with screws, and the shear pin is installed on an end of the lower joint away from the fishing neck.

[0009] As a further technical solution of the utility model: both the upper and lower ends of the salvage neck are provided with external threads. The upper external threads are used to connect other tool strings. A standard salvage neck is provided below the upper external threads to ensure that the corresponding salvage device can be selected for salvage when the tool is lowered and salvaged. The lower external threads are connected to the internal threads of the barrel to form an integral whole.

[0010] As a further technical solution of the utility model: the cylinder is a cylindrical structure as a whole, the inside of the cylinder is a variable step hole, the upper end of the cylinder is provided with an internal thread connected to the salvage neck, and the outer circumference of the cylinder is provided with a flat square, which is convenient for clamping and tightening the thread when it is threadedly connected with the lower end of the salvage neck;

[0011] Two symmetrical keyways are provided on the outer circle of the cylinder to limit the movable stroke of the slider. Two J-shaped grooves in a mirror-image relationship are provided at the lower end of the outer circle of the cylinder to provide guiding and limiting effects for the cylindrical pins during use. A chamfer is provided at the inner hole position of the lower end to provide guiding effects for the lower joint.

[0012] As a further technical solution of the utility model: the spring is a circular compression spring, one end of which is assembled on the small step of the slider and assembled inside the cylinder together with the slider, and the other end is close to the fishing neck to provide a buffering effect for the operation of the slider.

[0013] As a further technical solution of the utility model: the pin is a cylindrical structure, and the outer circle is a variable diameter structure. The middle diameter of the pin is smaller than the diameters of the two sides, ensuring that the pin can be fixed with the screws after being assembled on the slider. The outer diameters at both ends of the pin are smaller than the middle diameter of the pin, which ensures that the pin will not fall off during the sliding process after assembly.

[0014] As a further technical solution of the utility model: the slider has two step circles, wherein the large step circle is provided with two through holes which are perpendicular and intersecting, one hole is used to install a pin, and the other hole is used to install a screw for fixing the pin, a group of planes are provided on the large step circle for determining the assembly direction, and the small step circle is mainly used to fix the spring.

[0015] As a further technical solution of the utility model: the lower joint is composed of multiple step cylinders, the top end of which is a rope cap head structure, followed by a salvage neck, a step circle and a large step circle at the lower end, wherein the step circle has two vertical and intersecting through holes, one of which is used to assemble a cylindrical pin, and the other is used to assemble a screw to fix the cylindrical pin. The large step circle is provided with four ribs to straighten the flow, and a female thread is provided inside to connect to the lower test tool.

[0016] As a further technical solution of the utility model: the cylindrical pin is a solid shaft-like structure, wherein the outer diameter of the middle part is smaller than the outer diameters of the two ends, in order to form a step so as to be fixed with screws after assembly.

[0017] In summary, the present invention includes at least one of the following beneficial technical effects:

[0018] The utility model discloses a rotary release tool, which realizes the purpose of mechanically rotating the tool to release the tool during use by arranging two J-shaped grooves in a mirror relationship on a cylinder body, and has a simple structure and safe operation.

[0019] The cylinder is a cylindrical structure with a variable step hole inside. The upper end is connected to the salvage neck and is equipped with a spring and a slider. The slider is fixed by a pin and two symmetrical keyways on the outer circle of the cylinder. The pin moves in the two keyways in the cylinder, where the spring acts as a buffer and the keyway on the cylinder acts as a limiter. The lower joint is assembled inside the cylinder and fixed with a cylindrical pin through two mirror-image J-shaped grooves on the cylinder. To prevent the cylindrical pin from falling out, it is fixed with a screw. To ensure the safety of the tool during transportation, the entire tool is fixed with a shear pin. When it is needed, the shear pin is cut off first, the tool is subjected to a downward force, the lower joint pushes the slider upward, and the lower joint rotates and falls out along the J-shaped groove on the cylinder, and the tool string drives the salvage neck and the cylinder out. Because the lower joint itself is a rope cap structure, it can be directly salvaged and taken out with a salvage device after the operation is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the utility model after assembly.

[0021] Figure 2 Schematic diagram of cutting the shear pin before use.

[0022] Figure 3 This is a schematic diagram of the state where the lower joint is rotated out of the cylinder.

[0023] Figure 4 It is a schematic diagram of the structure of the salvage neck and cylinder after being lifted out of the utility model.

[0024] Figure numerals: 1. fishing neck; 2. cylinder; 3. spring; 4. pin; 5. slider; 6. lower joint; 7. cylindrical pin; 8. screw; 9. shear pin. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. Example

[0028] Reference Figure 1-4 , which is a rotary hand-dropping tool disclosed by the utility model, comprises a fishing neck 1, a cylinder 2, a spring 3, a pin 4, a slider 5, a lower joint 6, a cylindrical pin 7, a screw 8 and a shear pin 9. The lower joint 6, the slider 5 and the spring 3 are installed in the cylinder 2, the fishing neck 1 is connected to one end of the cylinder 2, the pin 4 is installed on the slider 5, the cylindrical pin 7 is installed on the lower joint 6, the slider 5 and the lower joint 6 are both installed with screws 8, and the shear pin 9 is installed at the end of the lower joint 6 away from the fishing neck 1.

[0029] External threads are provided at both the upper and lower ends of the salvage neck 1. The upper external thread is used to connect other tool strings. A standard salvage neck 1 is provided below the upper external thread to ensure that a corresponding salvage device can be selected for salvage when the tool is lowered and salvaged. The lower external thread is connected to the internal thread of the barrel 2 to form an integral body.

[0030] The cylinder body 2 is a cylindrical structure as a whole, and the interior of the cylinder body 2 is a variable step hole. The upper end of the cylinder body 2 is provided with an internal thread connected to the salvage neck 1, and the outer circle of the cylinder body 2 is provided with a flat square, which is convenient for clamping and tightening the thread when it is connected with the lower end of the salvage neck 1; two symmetrical keyways are provided on the outer circle of the cylinder body 2 to limit the active stroke of the slider 5, and two J-shaped grooves in a mirror image relationship are provided at the lower end of the outer circle of the cylinder body 2 to provide a guiding and limiting effect for the cylindrical pin 7 during use, and a chamfer is provided at the inner hole position of the lower end to provide a guiding effect for the lower joint 6.

[0031] The spring 3 is a circular compression spring 3, one end of which is assembled on the small step of the slider 5 and assembled inside the cylinder 2 together with the slider 5, and the other end is close to the fishing neck 1 to provide a buffering effect for the operation of the slider 5. The pin 4 is a cylindrical structure with a variable diameter structure on the outer circle. The middle diameter of the pin 4 is smaller than the diameters on both sides, ensuring that the pin 4 can be fixed with screws 8 after being assembled on the slider 5. The outer diameters of both ends of the pin 4 are smaller than the middle diameter of the pin 4, so that the pin 4 will not fall off during the sliding process after assembly.

[0032] The slider 5 has two step circles, and the large step circle is provided with two through holes in perpendicular and intersecting directions. One hole is used to install the pin 4, and the other hole is used to install the screw 8 to fix the pin 4. A set of planes is provided on the large step circle for determining the assembly direction, and the small step circle is mainly used to fix the spring 3.

[0033] The lower joint 6 is composed of multiple stepped cylinders, the top of which is a rope cap structure, followed by a salvage neck 1, a step circle and a large step circle at the lower end. The step circle has two perpendicular and intersecting through holes, one of which is equipped with a cylindrical pin 7, and the other is equipped with a screw 8 for fixing the cylindrical pin 7. The large step circle is provided with four ribs for straightening the flow, and a female thread is provided inside, which is connected to the lower test tool.

[0034] The cylindrical pin 7 is a solid shaft-like structure, wherein the outer diameter of the middle portion is smaller than the outer diameters of the two ends, in order to form a step so as to facilitate fixing with screws 8 after assembly.

[0035] The fishing neck 1 and the cylinder 2 are threadedly connected, and the spring 3 and the slider 5 are installed in turn. Then the pin 4 passes through the cylinder 2 and the slider 5 and is fixed with the screw 8. Then the lower joint 6 is installed to align the hole of the cylindrical pin 7 on the lower joint 6 with the J-shaped groove of the cylinder 2, and the cylindrical pin 7 is installed at the same time and fixed with the screw 8. Finally, the lower joint 6 is pushed to ensure that the shear pin 9 hole is aligned with the shear pin 9 hole of the cylinder 2. The shear pin 9 is installed to ensure the safe and reliable transportation of the entire tool.

[0036] refer to Figure 2 , is a schematic diagram of cutting the shear pin 9 before use. Figure 1 On the basis of ensuring that the lower joint 6 is firmly seated, the tool is vibrated downward to cut the shear pin 9 (such as Figure 2), the lower joint 6 and the cylindrical pin 7 rotate mechanically along the J-shaped groove of the cylinder 2 (such as Figure 3 ) three schematic diagrams, when the lower joint 6 and the cylindrical pin 7 slide mechanically along the J-shaped groove to the straight groove part, the cylinder 2 and the slider 5 and the spring 3 driven by the fishing neck 1 are lifted upward, and the lower joint 6 remains in the well (such as Figure 4 ), to achieve the task of the rotary throwing tool; the lower joint 6 is a rope cap head structure, the head has a standard fishing neck 1, and the corresponding fishing device can be used to remove it after the operation is completed.

[0037] The implementation principle of the utility model is as follows: the utility model discloses a rotary hand-release tool, wherein the lower joint 6 is firmly seated on the downhole tool, and the fishing neck 1 and the barrel 2 are shocked downward, and the lower joint 6 generates a relatively upward force to push the slider 5, and the slider 5 is steadily pushed by the lower joint 6 under the action of the spring 3, and the shear pin 9 is sheared off; the lower joint 6 and the cylindrical pin 7 continue to mechanically rotate along the J-shaped groove of the barrel 2, and when the lower joint 6 and the cylindrical pin 7 mechanically slide to the straight groove part along the J-shaped groove, the barrel 2 and the slider 5 and the spring 3 driven by the fishing neck 1 are lifted upward, and the lower joint 6 remains in the downhole, so as to realize the task of the rotary hand-release tool; the lower joint 6 is a rope cap head structure, and the head has a standard fishing neck 1, and can be taken out with a corresponding fishing device after the operation is completed.

[0038] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A rotary throwing tool, It is characterized in that The invention comprises a fishing neck (1), a cylinder (2), a spring (3), a pin (4), a slider (5), a lower joint (6), a cylindrical pin (7), a screw (8) and a shear pin (9), wherein the lower joint (6), the slider (5) and the spring (3) are installed in the cylinder (2), the fishing neck (1) is connected to one end of the cylinder (2), the pin (4) is installed on the slider (5), the cylindrical pin (7) is installed on the lower joint (6), the slider (5) and the lower joint (6) are both installed with screws (8), and the shear pin (9) is installed at one end of the lower joint (6) away from the fishing neck (1).

2. A rotary hand-release tool according to claim 1, It is characterized in that The upper and lower ends of the fishing neck (1) are both provided with external threads. The upper external threads are used to connect other tool strings. A standard fishing neck (1) is provided below the upper external threads to ensure that a corresponding fishing device can be selected for fishing when the tool is lowered and fished. The lower external threads are connected to the internal threads of the barrel (2) to form an integral body.

3. A rotary hand-release tool according to claim 1, It is characterized in that The cylinder (2) is a cylindrical structure as a whole, the interior of the cylinder (2) is a variable step hole, the upper end of the cylinder (2) is provided with an internal thread connected to the salvage neck (1), and the outer circumference of the cylinder (2) is provided with a flat square to facilitate clamping and tightening the thread when it is threadedly connected to the lower end of the salvage neck (1); Two symmetrical keyways are provided on the outer circle of the cylinder (2) to limit the movable stroke of the slider (5); two J-shaped grooves in a mirror-image relationship are provided at the lower end of the outer circle of the cylinder (2) to provide a guiding and limiting function for the cylindrical pin (7) during use; and a chamfer is provided at the inner hole position of the lower end to provide a guiding function for the lower joint (6).

4. A rotary hand-release tool according to claim 1, It is characterized in that The spring (3) is a circular compression spring (3), one end of which is mounted on the small step of the slider (5) and is mounted inside the cylinder (2) together with the slider (5), and the other end of which is in close contact with the fishing neck (1) to provide a buffering effect for the operation of the slider (5).

5. A rotary hand-release tool according to claim 1, It is characterized in that The pin (4) is a cylindrical structure, and the outer circle is a variable diameter structure. The middle diameter of the pin (4) is smaller than the diameters of the two sides, so that the pin (4) can be fixed with the screw (8) after being assembled on the slider (5). The outer diameters of the two ends of the pin (4) are smaller than the middle diameter of the pin (4), so that the pin (4) will not fall off during the sliding process after assembly.

6. A rotary hand-release tool according to claim 1, It is characterized in that The slider (5) has two step circles, wherein the large step circle is provided with two through holes in perpendicular directions and intersecting with each other, one hole is used to install a pin (4), and the other hole is used to install a screw (8) for fixing the pin (4). A set of planes is provided on the large step circle for determining the assembly direction, and the small step circle is mainly used to fix the spring (3).

7. A rotary hand-release tool according to claim 1, It is characterized in that The lower joint (6) is composed of a plurality of stepped cylinders, the top of which is a rope cap structure, followed by a salvage neck (1), a stepped circle and a large stepped circle at the bottom, wherein the stepped circle has two through holes in perpendicular directions and intersecting with each other, one of which is equipped with a cylindrical pin (7), and the other is equipped with a screw (8) for fixing the cylindrical pin (7). The large step circle is provided with four ribs for straightening the flow, and is provided with a female thread inside, which is connected to the lower test tool.

8. A rotary hand-release tool according to claim 1, It is characterized in that The cylindrical pin (7) is a solid shaft-shaped structure, wherein the outer diameter of the middle portion is smaller than the outer diameters of the two ends, in order to form a step so as to facilitate fixing with screws (8) after assembly.

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