Pin shearing device

Abstract

The invention discloses a pin shearing device which comprises a shearing outer sleeve and further comprises a shearing mandrel, the axial direction of the shearing mandrel is the same as the length direction of the shearing outer sleeve, the two ends of the shearing mandrel in the axial direction are a stress end and a built-in end respectively, the built-in end is located in a cavity, and a reserved space is formed between the built-in end and a second end. The inner diameter of the reserved space is not smaller than the outer diameter of the position, with the maximum diameter, of the shearing core shaft, at least one circle of pin containing space is formed in the outer circumferential wall of the shearing core shaft, the side wall, corresponding to the pin containing space, of the shearing outer sleeve is a circumferential wall, and a plurality of pin penetrating holes in one-to-one correspondence with the pin containing space are formed in the circumferential wall. And one end of the pin penetrates through and extends into the pin accommodating space. The shear value of the pin can be tested, whether the pin meets the design requirement or not is detected, and a test basis is provided for optimization of field use and tool design.

Description

Technical Field

[0001] The invention relates to the technical field of equipment related to oil testing and well completion, and in particular to a pin shearing device. Background Art

[0002] With the development of exploration and drilling technology, the Shunbei Oilfield in the Tarim Basin is buried deeper and deeper, with a well depth of 7500-9300m. The application of tools such as packers and sleeves in ultra-deep well completion operations has become normalized; at the same time, due to the increase in bottom hole temperature and pressure level, the requirements for tools such as packers and sleeves are becoming higher and higher, and the improvement of tool performance has also put forward more stringent requirements for the operation of various mechanisms of the tool, and even in certain cases, the pressure needs to be divided into multiple levels for operation. At this time, the shear value of the switch-shear pin that commonly controls the pressure level will be more important. A more accurate pin shear value can not only help tool designers to more strictly control the coordination between various mechanisms at the beginning of the tool design, but also ensure error-free coordination between different tools in the later construction process, which is safer and more accurate for downhole construction.

[0003] Therefore, it is particularly important to control the shear value of the pin. Nowadays, in terms of pin shear value detection, most of the support and design rely on the data calculated from the material properties. However, the material performance is only a range, not an exact value. This causes the shear value of the processed pins to have a large deviation. When the number of pins increases, the deviation value will increase, which has a greater impact on the use of the tool. Another way to detect the pin value is to test it on the tool body. Using a tool body such as a packer to test it not only causes unnecessary loss of materials such as sealing rings, but also greatly wastes the maintenance time of the tool.

[0004] Therefore, how to provide a device that can avoid the above-mentioned disadvantages has become a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0005] The technical problem to be solved by the present invention is a pin shearing device, which tests the shearing value of the pin to detect whether the pin meets the design requirements, and provides a test basis for on-site use and optimization of tool design.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A pin shearing device comprises a shearing sleeve having a length, wherein both ends of the shearing sleeve along the length direction are open and a chamber is provided inside the shearing sleeve to communicate with the two ends of the opening, wherein the two ends are respectively a first end and a second end, and further comprises a shearing mandrel, which is located in the chamber and the axial direction of the shearing mandrel is the same as the length direction of the shearing sleeve, wherein the two ends of the shearing mandrel in the axial direction are respectively a force-bearing end and an inner end, wherein the force-bearing end is arranged adjacent to the first end, and the inner end is arranged adjacent to the second end, and the inner end is located in the chamber and is connected to the inner end of the shearing mandrel. A reserved space is formed between the second ends, the inner diameter of the reserved space is not less than the outer diameter of the maximum diameter on the shear mandrel, at least one circle of pin accommodating space is formed on the outer circumferential wall of the shear mandrel, each circle of pin accommodating space includes a plurality of spaced-apart pin accommodating spaces opened in the circumferential direction at the same height of the shear mandrel, the side wall of the shear sleeve corresponding to the pin accommodating space is a circumferential wall and a plurality of pin through holes corresponding to the plurality of pin accommodating spaces are opened on the circumferential wall, so that one end of the pin passes through and extends into the pin accommodating space.

[0008] Preferably, an axial chamber extending in the axial direction of the shear mandrel is provided in the shear mandrel, and the axial chamber extends through and extends to the built-in end so that the built-in end is arranged as an annular surface, and the force-bearing end is arranged as a closed surface.

[0009] Preferably, a keyway is provided on the annular surface and extends inwardly in a direction identical to the axial direction of the shear mandrel, and the keyway is connected to the shaft chamber.

[0010] Preferably, the outer side wall of the shear mandrel abuts against the inner side wall of the shear sleeve.

[0011] Preferably, a first O-ring is arranged between the inner wall of the shear sleeve near the first end position and the outer wall of the shear core shaft near the force-bearing end position, and the shear sleeve also includes a cylindrical body. The shear sleeve is fixedly installed in the cylindrical body and the axes of the two are arranged to coincide with each other. A liquid inlet is provided on one end of the cylindrical body close to the force-bearing end, and the liquid inlet faces the force-bearing end. A pressure relief through hole penetrating the bottom end is provided at the bottom end of the cylindrical body, and a second O-ring is arranged between the outer wall of the shear sleeve near the first end position and the inner wall of the cylindrical body.

[0012] Preferably, the cylindrical body includes a pressure test joint, a pressure test sleeve and a plug which are connected in sequence and arranged in sequence along its axial direction, the pressure test joint is connected to the pressure test sleeve by a threaded connection, the pressure test sleeve is connected to the plug by a threaded connection, the shear sleeve is sleeved inside the pressure test sleeve and the second O-ring is arranged between the two, the second end of the shear sleeve abuts against the plug, and a third O-ring is arranged between the pressure test joint and the pressure test sleeve.

[0013] Preferably, the first end and the force-bearing end are arranged in alignment with each other.

[0014] Technical effects:

[0015] The pin shearing device uses a simple device to detect and control the shearing value of the pin, which not only saves construction time but also ensures the accuracy of the pin shearing value.

[0016] Method 1: Use hydraulic method for verification. First, assemble the first O-ring on the shear mandrel, assemble the upper end of the shear mandrel from the lower end of the shear sleeve, use tools to adjust the position from the lower end of the shear mandrel (through the keyway), align the shear hole or shear groove of the shear mandrel with the pin hole (such as a threaded hole) of the shear sleeve, and use a certain number of pins required to be measured to connect the shear mandrel and the shear sleeve at the threaded holes of corresponding specifications; assemble the second O-ring inside the pressure test sleeve, insert the shear sleeve into the pressure test sleeve, install the third O-ring outside the pressure test sleeve, connect the pressure test joint, pressure test sleeve, and plug in turn with threads, press from the pressure test hole at the upper end of the pressure test joint to knock down the shear mandrel.

[0017] Method 2: Verify by mechanical means. First, assemble the upper end of the shear mandrel from the lower end of the shear sleeve. Use tools to adjust the position from the lower end of the shear mandrel so that the shear hole or shear groove of the shear mandrel is aligned with the threaded hole of the shear sleeve. Use a certain number of pins required for measurement to connect the shear mandrel and the shear sleeve at the threaded holes of the corresponding specifications. Place the shear sleeve vertically upward at the test site and use the test machine to knock down the shear mandrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a specific implementation of the pin shearing device provided by the present invention.

[0019] Figure 1 The accompanying drawings are denoted as follows:

[0020] 1 shear sleeve, 2 first end, 3 second end, 4 shear mandrel, 5 force-bearing end, 6 built-in end, 7 reserved space, 8 pin, 9 shaft chamber, 10 keyway, 11 first O-ring, 12 liquid inlet, 13 pressure relief hole, 14 second O-ring, 15 pressure test joint, 16 pressure test sleeve, 17 plug, 18 third O-ring. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below.

[0022] The present invention will be described in more detail below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein and still achieve the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation of the present invention.

[0023] For the sake of clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would obscure the present invention with unnecessary details. It should be recognized that in the development of any actual embodiment, a large number of implementation details must be made to achieve the specific goals of the developer.

[0024] In order to make the purpose and features of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0025] Combination Figure 1The present invention provides a pin shearing device, comprising a shearing sleeve 1 having a length, wherein both ends of the shearing sleeve 1 along the length direction thereof are open and a chamber is provided inside the shearing sleeve 1 to communicate with the two ends of the opening, wherein the two ends are respectively a first end 2 and a second end 3, and further comprising a shearing mandrel 4, which is located in the chamber and the axial direction of the shearing mandrel 4 is the same as the length direction of the shearing sleeve 1, wherein the two ends of the shearing mandrel 4 in the axial direction thereof are respectively a force-bearing end 5 and an inner end 6, wherein the force-bearing end 5 is arranged adjacent to the first end 2, and the inner end 6 is arranged adjacent to the second end 2, and the inner end 6 is located adjacent to the first end 2. A reserved space 7 is formed in the chamber and between the chamber and the second end 2, the inner diameter of the reserved space 7 is not less than the outer diameter of the shear mandrel 4 at the maximum diameter, at least one circle of pin accommodating space is formed on the outer circumferential wall of the shear mandrel 4, each circle of pin accommodating space includes a plurality of spaced-apart pin accommodating spaces opened in the circumferential direction at the same height of the shear mandrel 4, the side wall of the shear sleeve 1 corresponding to the pin accommodating space is a circumferential wall and a plurality of pin through holes corresponding to the plurality of pin accommodating spaces are opened on the circumferential wall, so that one end of the pin 8 passes through and extends into the pin accommodating space.

[0026] The pin shearing device uses a simple device to detect and control the shearing value of the pin 8, which not only saves construction time but also ensures the accuracy of the shearing value of the pin 8.

[0027] Method 1: Use hydraulic method for verification. First, assemble the first O-ring 11 on the shear mandrel 4, assemble the force-bearing end 5 of the shear mandrel 4 from the second end 2 of the shear sleeve 1, and use tools to adjust the position from the built-in end of the shear mandrel 4 (through the keyway 10) so that the pin accommodating space (for example, a shear hole or a shear groove) opened on the shear mandrel 4 is aligned with the pin through-hole (for example, a threaded hole) of the shear sleeve 1, and use a certain number of pins 8 of required measurement to connect the shear mandrel 4 and the shear sleeve 1 together at the threaded holes of corresponding specifications; assemble the second O-ring 14 inside the pressure test sleeve 16, install the shear sleeve 1 into the pressure test sleeve 16, install the third O-ring 18 outside the pressure test sleeve 16, and connect the pressure test joint 15, the pressure test sleeve 16, and the plug 17 in turn with threads, pressurize from the upper end of the pressure test joint 15 (at the liquid inlet 12) to knock down the shear mandrel. The pressure can then be released through the pressure relief hole 13.

[0028] Method 2: Verification is performed mechanically. First, the upper end (stress-bearing end) of the shear mandrel 4 needs to be assembled from the lower end (second end) of the shear sleeve 1. Use tools to adjust the position from the lower end (built-in end) of the shear mandrel 4 so that the pin accommodating space (such as a shear hole or a shear groove) opened on the shear mandrel 4 is aligned with the pin through-hole (such as a threaded hole) of the shear sleeve 1. Use a certain number of pins 8 of the required measurement to connect the shear mandrel 4 and the shear sleeve 1 at the threaded holes of corresponding specifications. Place the shear sleeve 1 vertically upward at the test site, and use a test machine to knock down the shear mandrel 4.

[0029] In a specific implementation manner, Figure 1 As shown, the shear mandrel 4 is provided with an axial chamber 9 extending in its axial direction, and the axial chamber 9 extends through the built-in end 6 so that the built-in end 6 is provided as an annular surface, and the force-bearing end 5 is provided as a closed surface. The provision of the axial chamber 9 reduces the weight of the shear mandrel 4.

[0030] Furthermore, a keyway 10 extending inwardly in the same direction as the axial direction of the shear mandrel 4 is provided on the annular surface, and the keyway 10 is connected to the shaft chamber 9. The keyway 10 is used for combining tools to combine the shear mandrel 4 into the shear sleeve 1.

[0031] like Figure 1 As shown, the outer side wall of the shearing mandrel 4 abuts against the inner side wall of the shearing sleeve 1 .

[0032] In a specific embodiment, a first O-ring 11 is arranged between the inner wall of the shear sleeve 1 near the first end 2 and the outer wall of the shear mandrel 4 near the force end 5, and a cylindrical body is also included. The shear sleeve 1 is fixedly installed in the cylindrical body and the axes of the two are arranged to coincide with each other. A liquid inlet 12 is provided on one end of the cylindrical body close to the force end 5, and the liquid inlet 12 faces the force end 5. A pressure relief hole 13 is provided at the bottom end of the cylindrical body, and a second O-ring 14 is arranged between the outer wall of the shear sleeve 1 near the first end 2 and the inner wall of the cylindrical body. This arrangement is used for the detection of hydraulic experiments.

[0033] Furthermore, the cylindrical body includes a pressure test joint 15, a pressure test sleeve 16 and a plug 17 which are connected in sequence and arranged in sequence along its axial direction, the pressure test joint 15 is connected to the pressure test sleeve 16 by threads, the pressure test sleeve 16 is connected to the plug 17 by threads, the shear sleeve 1 is sleeved inside the pressure test sleeve 16 and the second O-ring 14 is arranged between the two, the second end 3 of the shear sleeve 1 abuts against the plug 17, and a third O-ring 18 is arranged between the pressure test joint 15 and the pressure test sleeve 16.

[0034] In a specific implementation manner, the first end 2 and the force-bearing end 5 are arranged in alignment with each other.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention, so the above is only an embodiment of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention also includes various equivalent changes and improvements, which will fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pin shearing device, characterized in that: The invention comprises a shearing sleeve having a length, wherein both ends of the shearing sleeve along the length direction are open and a chamber is provided inside the shearing sleeve to communicate with the two ends of the opening, wherein the two ends are respectively a first end and a second end, and a shearing mandrel is also included, which is located in the chamber and the axial direction of the shearing mandrel is the same as the length direction of the shearing sleeve, wherein the two ends of the shearing mandrel in the axial direction are respectively a force-bearing end and an internal end, wherein the force-bearing end is arranged adjacent to the first end, and the internal end is arranged adjacent to the second end, and the internal end is located in the chamber and is connected to the second end. A reserved space is formed between the shear core shaft, the inner diameter of the reserved space is not less than the outer diameter of the maximum diameter on the shear core shaft, at least one circle of pin accommodating space is formed on the outer circumferential wall of the shear core shaft, each circle of pin accommodating space includes a plurality of spaced-apart pin accommodating spaces opened in the circumferential direction at the same height of the shear core shaft, the side wall of the shear sleeve corresponding to the pin accommodating space is a circumferential wall and a plurality of pin through holes corresponding to the plurality of pin accommodating spaces are opened on the circumferential wall, so that one end of the pin passes through and extends into the pin accommodating space.

2. The pin shearing device according to claim 1, characterized in that: An axial chamber extending along the axial direction of the shearing mandrel is provided in the shearing mandrel, and the axial chamber extends through the built-in end so that the built-in end is arranged as an annular surface, and the force-bearing end is arranged as a closed surface.

3. The pin shearing device according to claim 2, characterized in that: The annular surface is provided with a keyway extending inwardly in a direction identical to the axial direction of the shear mandrel, and the keyway is connected to the shaft chamber.

4. The pin shearing device according to claim 1, characterized in that: The outer side wall of the shearing mandrel abuts against the inner side wall of the shearing sleeve.

5. The pin shearing device according to claim 4, characterized in that: A first O-ring is arranged between the inner wall of the shear sleeve near the first end position and the outer wall of the shear core shaft near the force-bearing end position, and the shear sleeve also includes a cylindrical body. The shear sleeve is fixedly installed in the cylindrical body and the axes of the two are arranged to coincide with each other. A liquid inlet is provided on one end of the cylindrical body close to the force-bearing end, and the liquid inlet faces the force-bearing end. A pressure relief through hole penetrating the bottom end is provided at the bottom end of the cylindrical body. A second O-ring is arranged between the outer wall of the shear sleeve near the first end position and the inner wall of the cylindrical body.

6. The pin shearing device according to claim 5, characterized in that: The cylindrical body includes a pressure test joint, a pressure test sleeve and a plug which are connected in sequence and arranged in sequence along its axial direction, the pressure test joint is connected to the pressure test sleeve by a thread, the pressure test sleeve is connected to the plug by a thread, the shear sleeve is sleeved inside the pressure test sleeve and the second O-ring is arranged between the two, the second end of the shear sleeve abuts against the plug, and a third O-ring is arranged between the pressure test joint and the pressure test sleeve.

7. The pin shearing device according to claim 1, characterized in that: The first end and the force-bearing end are arranged in alignment with each other.

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