Shearing force testing device and testing method thereof

Abstract

The invention relates to the field of shearing force testing, in particular to a shearing force testing device and a shearing force testing method, and aims to relieve the technical problem of low shearing force testing efficiency in the prior art. The shearing force testing device comprises a base, a shearing sleeve and a shearing piece, the base is a cylinder; the shearing sleeve is cylindrical, is arranged on the base in a sleeving manner and can move in the axial direction of the shearing sleeve relative to the base; the multiple shearing pieces are distributed around the axis of the base at intervals and / or distributed in the axial direction of the base at intervals, and the shearing pieces are connected with the base and the shearing sleeve so as to prevent the shearing sleeve from moving relative to the base in the axial direction of the shearing sleeve. By means of the shearing force testing device, the actual opening process of the downhole tool can be simulated, testing of one or more shearing pieces is achieved, and accurate opening force is obtained.

Description

Technical Field

[0001] The invention relates to the field of shear force testing, and in particular to a shear force testing device and a testing method thereof. Background Art

[0002] Oil tools (such as ball-dropping sleeves, floating couplings, hand-dropping tools, etc.) all need to be opened by cutting shear pins or shear rings, and the opening force is directly determined by the shear force of the shear pins or shear rings. The accuracy of the shear force control of the shear pins or shear rings directly affects the application efficiency and safety of downhole tools. If the shear force control of the shear pins or shear rings is not accurate, the tools will be opened prematurely or cannot be opened according to the construction design, which will directly affect the construction efficiency and cause serious construction accidents.

[0003] At present, in order to accurately grasp the shear force of shear pins or shear rings, the test method used is to directly assemble shear pins or shear rings on existing finished products (i.e. downhole tools) and test them multiple times to ensure accurate opening force. It should be pointed out that this method involves multiple disassembly and assembly of tools, which is inefficient. Moreover, since the mechanical properties of materials used to process shear pins or shear rings in different batches are slightly different, each batch of shear pins or shear rings needs to be tested multiple times, which undoubtedly increases the workload again and further reduces the test efficiency. Summary of the invention

[0004] The object of the present invention is to provide a shear force testing device and a testing method thereof, so as to alleviate the technical problem of low shear force testing efficiency in the prior art.

[0005] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0006] In a first aspect, the shear force testing device provided by the present invention comprises: a base, a shear sleeve and a shear member;

[0007] The base is a column;

[0008] The shear sleeve is cylindrical and sleeved on the base, and can move along its own axial direction relative to the base;

[0009] There are multiple shearing pieces, which are spaced apart around the axis of the base and / or spaced apart along the axial direction of the base. The shearing pieces are respectively connected to the base and the shearing sleeve to prevent the shearing sleeve from moving axially relative to the base.

[0010] Further, the shearing member includes shear nails;

[0011] The base is provided with a plurality of blind holes adapted to the shear nails, and the plurality of blind holes are distributed at intervals along the circumference and axial direction of the base;

[0012] The shear sleeve is provided with a plurality of through holes penetrating the side wall thereof and matching with the shear pins. The plurality of through holes are distributed at intervals along the circumference and axial direction of the shear sleeve and correspond one-to-one with the blind holes.

[0013] Furthermore, the base is a stepped shaft, and the diameter of each section increases successively from one end to the other end of the base;

[0014] The shear sleeve has a stepped hole matched with the base and is located on the stepped surface of the base, and the inner wall of the shear sleeve is in contact with the base.

[0015] Furthermore, each section of the base is provided with at least one circle of the blind holes.

[0016] Furthermore, the sizes of the blind holes are not completely consistent.

[0017] Furthermore, the shearing piece includes a shearing ring, which is sleeved on the base and abuts between the base and the inner wall of the shearing sleeve.

[0018] Furthermore, the base is a stepped shaft, and the diameter of each section increases successively from one end to the other end of the base;

[0019] The shear sleeve has a stepped hole adapted to the base;

[0020] The shear ring abuts between the stepped surfaces of the shear sleeve and the base, and is clamped between the inner side wall of the shear sleeve and the side wall of the base.

[0021] In a second aspect, the shear force testing method provided by the present invention is based on the above-mentioned shear force testing device, comprising the following steps:

[0022] Assembly: Connect the shearing piece to the base and the shearing sleeve respectively to form a shearing force testing device;

[0023] Test: Place the assembled shear force test device on a universal testing machine for material testing, and then squeeze the base or the shear sleeve through a compression disk until the shear piece is broken.

[0024] Furthermore, when the shearing piece is a shearing nail, in the assembly step, the shearing sleeve is firstly placed on the base, and the through holes and the blind holes are connected one by one, and then a preset number of shearing nails to be tested are taken, and the shearing nails are inserted into the through holes and the blind holes at different positions;

[0025] In the testing step, the compression disk acts on the upper surface of the base and presses the base downward until the shear pins are broken.

[0026] Furthermore, when the shearing piece is a shearing ring, in the assembly step, firstly, a preset number of shearing rings to be tested are taken and placed correspondingly on the shoulders of the base, and then the shearing sleeve is mounted on the base;

[0027] In the testing step, the compression disk acts on the upper surface of the shear sleeve and presses the shear sleeve downward until the shear ring is broken.

[0028] Based on the above technical solutions, the technical effects that can be achieved by the shear force testing device provided by the present invention are:

[0029] The shear force testing device comprises a base, a shear sleeve and a shear piece; the base is a column; the shear sleeve is cylindrical and is sleeved on the base, and can move along its own axial direction relative to the base; there are multiple shear pieces, and the multiple shear pieces are distributed at intervals around the axis of the base and / or distributed at intervals along the axial direction of the base, and the shear pieces are respectively connected to the base and the shear sleeve to prevent the shear sleeve from moving along its own axial direction relative to the base.

[0030] In the shear force testing device, the shearing piece is connected to the base and the shearing sleeve respectively. After the shearing piece is broken by pressure, the shearing sleeve and the base can move relative to each other. It can be seen that the base, the shearing sleeve and the shearing piece cooperate to simulate the actual opening process of the downhole tool. Through the cooperation of the three, the shearing force of the shearing piece can be measured to obtain the accurate opening force. Compared with the existing technology, the shear force testing device is simple to assemble and has a high testing efficiency.

[0031] In addition, when there are multiple shear pieces, they can be distributed at intervals around the axis of the base, or distributed at intervals along the axis of the base, or distributed at intervals around the axis of the base and also distributed at intervals along the axis of the base. It can be seen that the shear force testing device can arrange the shear pieces according to the actual situation of the downhole tool and meet the testing of single or multiple shear pieces, thereby further improving the testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A cross-sectional view of an embodiment of a shear force testing device provided by an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A cross-sectional view of the middle base;

[0035] Figure 3 for Figure 1 A cross-sectional view of the middle shear sleeve;

[0036] Figure 4 A cross-sectional view of another embodiment of a shear force testing device provided by an embodiment of the present invention;

[0037] Figure 5 for Figure 4 A cross-sectional view of the middle base;

[0038] Figure 6 for Figure 4 Sectional view of the shear sleeve.

[0039] Icon: 100-base; 110-blind hole;

[0040] 200- shear sleeve; 210- through hole;

[0041] 300-shear nails; 400-shear rings. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0045] In order to accurately grasp the shear force of the shear pins or shear rings, the test method adopted is to directly assemble the shear pins or shear rings on the existing finished products (i.e., downhole tools) and test them multiple times to ensure accurate opening force. It should be pointed out that this method involves multiple disassembly and assembly of the tools, which is inefficient. Moreover, since the mechanical properties of the materials used to process the shear pins or shear rings in different batches are slightly different, each batch of shear pins or shear rings needs to be tested multiple times, which undoubtedly increases the workload again and further reduces the test efficiency.

[0046] In view of this, the present invention provides a shear force testing device, including a base 100, a shear sleeve 200 and a shear piece; the base 100 is a column; the shear sleeve 200 is cylindrical and is sleeved on the base 100, and can move along its own axial direction relative to the base 100; there are multiple shear pieces, and the multiple shear pieces are distributed at intervals around the axis of the base 100, and / or distributed at intervals along the axial direction of the base 100, and the shear pieces are respectively connected to the base 100 and the shear sleeve 200 to prevent the shear sleeve 200 from moving along its own axial direction relative to the base 100.

[0047] In the shear force testing device, the shearing piece is connected to the base 100 and the shearing sleeve 200 respectively. After the shearing piece is pressed off, the shearing sleeve 200 and the base 100 can move relative to each other. It can be seen that the base 100, the shearing sleeve 200 and the shearing piece cooperate to simulate the actual opening process of the downhole tool. Through the cooperation of the three, the shearing force of the shearing piece can be measured to obtain the accurate opening force. Compared with the prior art, the shear force testing device is simple to assemble and has a high testing efficiency.

[0048] In addition, when there are multiple shearing pieces, they can be distributed at intervals around the axis of the base 100, or distributed at intervals along the axis of the base 100, or distributed at intervals around the axis of the base 100 and also distributed at intervals along the axis of the base 100. It can be seen that the shearing force testing device can arrange the shearing pieces according to the actual situation of the downhole tool and meet the testing of single or multiple shearing pieces, thereby further improving the testing efficiency.

[0049] The following combination Figures 1 to 6 The structure and shape of the shear force testing device provided in this embodiment are described in detail:

[0050] Embodiment 1:

[0051] refer to Figures 1 to 3 The shearing piece includes a shearing nail 300; a plurality of blind holes 110 adapted to the shearing nail 300 are provided on the base 100, and the plurality of blind holes 110 are distributed at intervals along the circumference and axial direction of the base 100; a plurality of through holes 210 penetrating through the side wall of the shearing sleeve 200 and adapted to the shearing nail 300 are provided, and the plurality of through holes 210 are distributed at intervals along the circumference and axial direction of the shearing sleeve 200, and correspond one to one to the blind holes 110.

[0052] Specifically, the base 100 may be a cylinder, and correspondingly, the through hole 210 of the shear sleeve 200 is cylindrical. Figure 2 , the base 100 is a stepped shaft, and the diameter of each section increases from one end to the other end of the base 100; Figure 1 and 3The shear sleeve 200 has a stepped hole adapted to the base 100 and is seated on the stepped surface of the base 100, and the inner wall of the shear sleeve 200 is in contact with the base 100. Figures 1 to 3 At least one circle of blind holes 110 is provided on each section of the base 100, which may be two circles as shown in the figure. In addition, the size and quantity of the blind holes 110 and the corresponding through holes 210 can be designed according to actual needs, which will not be elaborated here.

[0053] By adopting the above design, the shear force of shear nails 300 of different sizes, quantities and materials can be tested, that is, it can meet the shear force test of single or multiple shear nails 300 of the same size, and can also complete the shear force test of multiple shear nails 300 of different sizes. There is no need to test on downhole tools, which improves test efficiency and reduces test costs.

[0054] Embodiment 2:

[0055] refer to Figures 4 to 6 The shearing piece includes a shearing ring 400; the base 100 is a stepped shaft, and the diameters of each section increase successively from one end to the other end of the base 100; the shearing sleeve 200 has a stepped hole adapted to the base 100; the shearing ring 400 abuts between the stepped surfaces of the shearing sleeve 200 and the base 100, and is clamped between the inner side wall of the shearing sleeve 200 and the side wall of the base 100.

[0056] By adopting the above design, the shear force of shear rings 400 of different sizes and materials can be tested without testing on downhole tools, thereby improving the test efficiency and reducing the test cost. It should also be noted that the diameters of each section of the base 100 and the corresponding inner diameter of the shear sleeve 200 are processed according to the size of the shear ring 400, and can be adapted to shear rings 400 of different specifications.

[0057] The present invention also provides a shear force testing method, based on the above-mentioned shear force testing device, comprising the following steps:

[0058] Assembly: Connect the shearing piece to the base 100 and the shearing sleeve 200 respectively to form a shearing force testing device; Testing: Place the assembled shearing force testing device on a universal testing machine for material testing, and then squeeze the base 100 or the shearing sleeve 200 through a compression disk until the shearing piece is broken.

[0059] Specifically, when the shearing piece is a shearing nail 300, in the assembly step, the shearing sleeve 200 is first placed on the base 100, and the through holes 210 and the blind holes 110 are connected one by one, and then a preset number of shearing nails 300 to be tested are taken, and the shearing nails 300 are inserted into the through holes 210 and the blind holes 110 at different positions; in the testing step, the compression disk acts on the upper surface of the base 100, and presses the base 100 downward until the shearing nails 300 are broken, at which time the total shear force of the tested shearing nails 300 can be directly read from the universal testing machine.

[0060] When the shearing piece is a shearing ring 400, in the assembly step, firstly, a preset number of shearing rings 400 to be tested are taken and placed correspondingly on the shoulders of the base 100, and then the shearing sleeve 200 is sleeved on the base 100; in the testing step, the compression disk acts on the upper surface of the shearing sleeve 200 and presses the shearing sleeve 200 downward until the shearing ring 400 is broken, at which time the total shear force of the tested shearing ring 400 can be directly read from the universal testing machine.

[0061] It can be seen here that the above test process is clean and environmentally friendly, the shear force testing device is easy to install and disassemble, and the shear force test of the shear nail 300 and the shear ring 400 is accurate.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shear force testing device, characterized in that: include: A base (100), a shear sleeve (200) and a shear member; The base (100) is a column; The shear sleeve (200) is cylindrical and sleeved on the base (100), and can move along its own axial direction relative to the base (100); The shearing pieces are provided in plurality, and the plurality of shearing pieces are spaced apart around the axis of the base (100) and / or spaced apart along the axial direction of the base (100). The shearing pieces are respectively connected to the base (100) and the shearing sleeve (200) to prevent the shearing sleeve (200) from moving along its own axial direction relative to the base (100).

2. The shear force testing device according to claim 1, characterized in that: The shearing member comprises a shearing nail (300); The base (100) is provided with a plurality of blind holes (110) adapted to the shear pins (300), and the plurality of blind holes (110) are distributed at intervals along the circumference and axial direction of the base (100); The shear sleeve (200) is provided with a plurality of through holes (210) penetrating its side wall and matching the shear pins (300). The plurality of through holes (210) are distributed at intervals along the circumference and axial direction of the shear sleeve (200) and correspond one-to-one to the blind holes (110).

3. The shear force testing device according to claim 2, characterized in that: The base (100) is a stepped shaft, and the diameter of each section increases sequentially from one end to the other end of the base (100); The shear sleeve (200) has a stepped hole matched with the base (100) and is located on the stepped surface of the base (100), and the inner wall of the shear sleeve (200) is in contact with the base (100).

4. The shear force testing device according to claim 3, characterized in that: At least one circle of the blind holes (110) is provided on each section of the base (100).

5. The shear force testing device according to claim 2, characterized in that: The sizes of the blind holes (110) are not completely consistent.

6. The shear force testing device according to claim 1, characterized in that: The shearing piece comprises a shearing ring (400), which is sleeved on the base (100) and abuts between the base (100) and the inner wall of the shearing sleeve (200).

7. The shear force testing device according to claim 6, characterized in that: The base (100) is a stepped shaft, and the diameter of each section increases sequentially from one end to the other end of the base (100); The shear sleeve (200) has a stepped hole adapted to the base (100); The shear ring (400) abuts between the stepped surfaces of the shear sleeve (200) and the base (100), and is clamped between the inner side wall of the shear sleeve (200) and the side wall of the base (100).

8. A shear force testing method, based on the shear force testing device according to any one of claims 1 to 7, comprising the following steps: Assembly: Connect the shearing piece to the base (100) and the shearing sleeve (200) respectively to form a shearing force testing device; Testing: The assembled shear force testing device is placed on a universal testing machine for material testing, and then the base (100) or the shear sleeve (200) is squeezed by a compression disk until the shear piece is broken.

9. The shear force testing method according to claim 8, characterized in that: When the shearing piece is a shearing nail (300), in the assembly step, the shearing sleeve (200) is firstly placed on the base (100), and the through holes (210) and the blind holes (110) are connected one by one, and then a preset number of shearing nails (300) to be tested are taken, and the shearing nails (300) are inserted into the through holes (210) and the blind holes (110) at different positions; In the testing step, the compression disk acts on the upper surface of the base (100) and presses the base (100) downward until the shear pins (300) are broken.

10. The shear force testing method according to claim 8, characterized in that: When the shearing piece is a shearing ring (400), in the assembly step, firstly, a preset number of shearing rings (400) to be tested are taken and placed correspondingly on the shaft shoulders of the base (100), and then the shearing sleeve (200) is sleeved on the base (100); In the test step, the compression disk acts on the upper surface of the shear sleeve (200) and presses the shear sleeve (200) downward until the shear ring (400) is broken.

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