General tension-torsion-bending composite clamp for mechanical performance detection of sand control screen

Abstract

The utility model relates to the field of sand control screen detection, and discloses a pulling-twisting-bending composite clamp for detecting the general mechanical performance of a sand control screen, which comprises a driving end clamp, a linear guide rail is slidably connected to the bottom end of the driving end clamp, and a bending clamp is slidably connected to the top end of a sliding block of the linear guide rail. A driven end clamp is slidably connected to the top end of a sliding block of the linear guide rail, a sand control screen pipe is fixedly connected into the bending clamp, one end of the sand control screen pipe is fixedly connected to the right side of the driving end clamp, the other end of the sand control screen pipe is fixedly connected to the left side of the driven end clamp, and a hydrostatic bearing is fixedly connected to the right side of the driven end clamp. According to the utility model, through the arrangement of the driving end clamp, the bending clamp and the driven end clamp, various combined tests or single tests in different forms can be carried out, so that the actual working condition load of the sand control screen pipe and the well completion tool in a well can be simulated, and the test is relatively accurate.

Description

Technical Field

[0001] The utility model relates to the field of sand control screen pipe detection, in particular to a tensile-torsional-bending composite fixture for general mechanical property detection of sand control screen pipes. Background Art

[0002] The sand control screen pipe is a product developed to solve the problems of sand production in oil and gas wells and non-perforating development of horizontal well groups during the development process of oil and gas wells. It is equipped with multiple layers of sand control filter sleeves, which have efficient sand control performance and can more effectively block formation sand grains to meet the downhole sand control needs.

[0003] After retrieval, Chinese Patent Publication No.: CN21872613U discloses an oil and gas pipeline tensile testing machine, which includes a test frame. The test frame includes a front fixed crossbeam, a left connecting frame, a rear fixed crossbeam, and a right connecting frame connected in sequence; the force transmission frame includes a front moving crossbeam, a left connecting shaft, a rear moving crossbeam, and a right connecting shaft connected in sequence; the front moving crossbeam and the rear moving crossbeam are respectively arranged on the front and rear sides of the front fixed crossbeam, and the pipeline installation space is between the rear moving crossbeam and the rear fixed crossbeam. Ear plates for connecting the pipeline ends are arranged on the rear moving crossbeam and the rear fixed crossbeam, and the support assembly is arranged below the pipeline installation space; the cylinder body of the thrust oil cylinder is installed on the front fixed crossbeam, and the end of the piston rod of the thrust oil cylinder is connected to the front moving crossbeam; the pressure sensor is arranged between the piston rod of the thrust oil cylinder and the front moving crossbeam. This application solves the problem that there is no suitable tensile testing machine for large long-distance pipelines in the prior art to conduct tensile tests.

[0004] Although this technology can conduct tensile tests on oil and gas pipelines, in actual applications, the loading conditions of sand control screen pipes in the wellbore are very complex, with both tensile and compressive loads, as well as bending and torsional loads, and combined loads such as tension-bending and tension-torsion. The equipment of the current technology can only simulate one of the performances of tension, compression, bending, and torsion, and cannot apply tensile, compressive axial loads, and combined loads such as tensile bending and tensile torsion to the sand control screen pipe, and cannot simulate the actual working condition loads of the sand control screen pipe and the completion tool in the wellbore, and cannot meet the requirements for the tensile load, compressive load, bending load, torsional load, and mechanical properties such as tension-bending and tension-torsion of the completion tool and the sand control screen pipe; on the other hand, when conducting a tensile-torsion combined test, ordinary bearings or the loading cylinder itself are used as the axial bearing and rotating bearing. As the axial load increases, the torsional friction torque also increases, which will have a very large impact on the measurement accuracy of the torque. Therefore, a tensile-torsional-bending composite fixture for general mechanical property detection of sand control screen pipes is proposed to solve the above problems. Content of the Utility Model

[0005] To make up for the above deficiencies, the present utility model provides a tensile-torsional-bending composite fixture for general mechanical property testing of sand control screens, aiming to improve problems such as the inability to simulate the actual working condition loads of sand control screens and completion tools in the wellbore in the prior art.

[0006] To achieve the above object, the present utility model adopts the following technical solution: A tensile-torsional-bending composite fixture for general mechanical property testing of sand control screens, comprising an active end fixture. A linear guide is slidably connected to the bottom end of the active end fixture. A bending fixture is slidably connected to the top end of the slider of the linear guide. A passive end fixture is slidably connected to the top end of the slider of the linear guide. A sand control screen is fixedly connected inside the bending fixture. One end of the sand control screen is fixedly connected to the right side of the active end fixture, and the other end of the sand control screen is fixedly connected to the left side of the passive end fixture. A static pressure bearing is fixedly connected to the right side of the passive end fixture.

[0007] As a further description of the above technical solution:

[0008] The active end fixture includes a hinge support. The bottom end of the hinge support is fixedly connected to the top end of the slider of the linear guide. A left hinge shaft is rotatably connected inside the hinge support through a left bearing. An active clamping body is fixedly connected to the outer periphery of the left hinge shaft. Left clamping covers are detachably connected to the upper and lower sides of the active clamping body by screws. A left elastic support is fixedly connected to the top end of the base of the hinge support.

[0009] As a further description of the above technical solution:

[0010] The bending fixture includes an oil cylinder mounting seat. The bottom end of the oil cylinder mounting seat is fixedly connected to the top end of the slider of the linear guide. A lower hinge support is fixedly connected to the bottom end of the oil cylinder mounting seat. A bending loading oil cylinder is fixedly connected to the outer periphery of the lower hinge support. The output shaft of the top end of the bending loading oil cylinder is fixedly connected to an upper hinge support. The upper hinge support is hinged to a bending clamping body through an upper hinge shaft. A tensile connecting piece is detachably connected to the top end of the bending clamping body by bolts. An anti-tipping device is fixedly connected to the top end of the oil cylinder mounting seat. A force sensor is arranged on the outer periphery of the bending loading oil cylinder.

[0011] As a further description of the above technical solution:

[0012] The anti-tipping device is composed of two groups of L-shaped clamping plates. The bottom ends of the two groups of L-shaped clamping plates are fixedly connected to the top end of the oil cylinder mounting seat. The two groups of L-shaped clamping plates are symmetrically arranged on the left and right sides of the bending clamping body.

[0013] As a further description of the above technical solution:

[0014] The passive end fixture includes a bearing base, the bottom end of the bearing base is fixedly connected to the top end of a linear guide rail slider, the top end of the bearing base is fixedly connected with a hinge seat, a hinge shaft is fixedly connected inside the hinge seat through a right bearing, a passive fixture body is fixedly connected to the outer periphery of the hinge shaft, the upper and lower ends of the passive fixture body are detachably connected with a right fixture cover plate through bolts, a fastening screw rod is slidably connected inside the hinge seat, a double-wedge pad is slidably connected to the outer periphery of the fastening screw rod, and a right elastic support is fixedly connected to the top end of the bearing base.

[0015] As a further description of the above technical solution:

[0016] The bottom end of the double-wedge pad is placed on the top end of the bearing base, the lower part of the fastening screw rod is threadedly connected to the top end of the bearing base, and the upper part of the fastening screw rod is fixed to the top end of the hinge seat with a nut.

[0017] As a further description of the above technical solution:

[0018] The sand control screen pipe includes a sand control screen pipe specimen, the outer periphery of the sand control screen pipe specimen is detachably connected inside a bending fixture body, fixture flanges are fixedly connected to both ends of the sand control screen pipe specimen, the outer periphery of the right fixture flange is detachably connected inside the passive fixture body, and the outer periphery of the left fixture flange is detachably connected inside the active fixture body.

[0019] As a further description of the above technical solution:

[0020] The cylindrical parts of the two groups of fixture flanges are coaxial, the flange parts of the two groups of fixture flanges are parallel, the upper and lower ends of the left fixture flange are in contact with the left fixture cover plate, and the upper and lower ends of the right fixture flange are in contact with the right fixture cover plate.

[0021] The present utility model has the following beneficial effects:

[0022] 1. In the present utility model, by setting an active end fixture, a bending fixture, and a passive end fixture, 5 kinds of tests can be carried out: axial load system test: maximum tensile load test, maximum compressive load test, minimum tensile load test, minimum compressive load test; bending load system test: three-point bending, four-point bending; torsional load system test; combined tensile and bending test; combined tensile and torsional test, so as to simulate the actual working condition load of the sand control screen pipe, and the test is relatively accurate.

[0023] 2. In the present utility model, a hydrostatic bearing is used to bear the axial load in the combined tensile and torsional test. When rotating, there is a lubricating oil film that separates the working surfaces of the friction pairs, which can bear axial force and radial force. Therefore, the torque generated by friction during the torsional test can be basically ignored, and the measurement of the test torque is accurate.

[0024] 3. In the present utility model, by providing structures such as a hinge support, an upper hinge support, a lower hinge support, and a hinge shaft, the axial additional force generated due to the deformation of the specimen can be effectively eliminated, ensuring the measurement accuracy of the bending test. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the overall fixture connection of a tensile-torsional-bending composite fixture for general mechanical property testing of a sand control screen pipe proposed by the present utility model;

[0026] Figure 2 It is a schematic diagram of the active-end fixture of a tensile-torsional-bending composite fixture for general mechanical property testing of a sand control screen pipe proposed by the present utility model;

[0027] Figure 3 It is a schematic diagram of the bending fixture of a tensile-torsional-bending composite fixture for general mechanical property testing of a sand control screen pipe proposed by the present utility model;

[0028] Figure 4 It is a schematic diagram of a sand control screen pipe specimen of a tensile-torsional-bending composite fixture for general mechanical property testing of a sand control screen pipe proposed by the present utility model;

[0029] Figure 5 It is a schematic diagram of the passive-end fixture of a tensile-torsional-bending composite fixture for general mechanical property testing of a sand control screen pipe proposed by the present utility model.

[0030] Legend Explanation:

[0031] 1. Active-end fixture; 1.1. Hinge support; 1.2. Left hinge shaft; 1.3. Left bearing; 1.4. Active fixture body; 1.5. Left elastic support; 1.6. Left fixture cover plate; 2. Linear guide rail; 3. Bending fixture; 3.1. Bending loading oil cylinder; 3.2. Oil cylinder mounting seat; 3.3. Anti-tipping device; 3.4. Upper hinge shaft; 3.5. Tensile connecting piece; 3.6. Bending fixture body; 3.7. Upper hinge support; 3.8. Force sensor; 3.9. Lower hinge support; 4. Sand control screen pipe; 4.1. Sand control screen pipe specimen; 4.2. Fixture flange; 5. Passive-end fixture; 5.1. Hinge shaft; 5.2. Right bearing; 5.3. Passive fixture body; 5.4. Hinge seat; 5.5. Tightening screw; 5.6. Right fixture cover plate; 5.7. Right elastic support; 5.8. Bearing base; 5.9. Double wedge pad; 6. Hydrostatic bearing. Detailed Embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the protection scope of the present utility model.

[0033] Referring to Figure 1 , an embodiment provided by the present utility model: a combined tension-torsion-bending fixture for general mechanical property testing of a sand control screen pipe, including an active-end fixture 1, the active-end fixture 1 is connected to the main machine force application mechanism, and the main machine force application mechanism can push or stretch the active-end fixture 1. A linear guide rail 2 is slidably connected to the bottom end of the active-end fixture 1. The linear guide rail 2 is composed of a linear track and a slider that can slide along the linear track. A bending fixture 3 for applying bending pressure to the specimen is slidably connected to the top end of the slider of the linear guide rail 2. A passive-end fixture 5 is slidably connected to the top end of the slider of the linear guide rail 2. A sand control screen pipe 4 is fixedly connected inside the bending fixture 3. One end of the sand control screen pipe 4 is fixedly connected to the right side of the active-end fixture 1, and the other end of the sand control screen pipe 4 is fixedly connected to the left side of the passive-end fixture 5. A static pressure bearing 6 is fixedly connected to the right side of the passive-end fixture 5. The outer ring of the static pressure bearing 6 is connected to the main machine reaction beam, and the inner ring shaft is connected to the main machine torque application mechanism to apply torsional pressure to the specimen, so that the entire passive-end fixture 5 can rotate through static pressure support. There is a lubricating oil film separating the working surfaces of the friction pairs during the rotation operation, which can bear axial force and radial force and reduce friction during rotation.

[0034] Referring to Figure 2 , the active-end fixture 1 includes a hinge support 1.1 that plays a role in fixed support. The bottom end of the hinge support 1.1 is fixedly connected to the top end of the slider of the linear guide rail 2, and its position can be adjusted according to the length of the specimen. A left hinge shaft 1.2 is rotatably connected inside the hinge support 1.1 through a left bearing 1.3. An active clamping body 1.4 is fixedly connected to the outer periphery of the left hinge shaft 1.2. The hinge shaft 1.2 is connected to the hinge support 1.1 through the left bearing 1.3. The formed rotating pair enables the specimen to freely deform when the active clamping body 1.4 is subjected to a bending load. Left fixture covers 1.6 are detachably connected to the upper and lower sides of the active clamping body 1.4 by screws, so that the active clamping body 1.4 can bear torsional loads. A left elastic support 1.5 is fixedly connected to the top end of the base of the hinge support 1.1, and the left elastic support 1.5 is used to support the active clamping body 1.4 when loading and unloading the specimen.

[0035] Referring to Figure 3, the bending fixture 3 includes an oil cylinder mounting seat 3.2 that serves as a fixed support. The bottom end of the oil cylinder mounting seat 3.2 is fixedly connected to the top end of the slider of the linear guide rail 2, and its position can be adjusted according to the length of the specimen. The bottom end of the oil cylinder mounting seat 3.2 is fixedly connected with a lower hinge support 3.9. The outer periphery of the lower hinge support 3.9 is fixedly connected with a bending loading oil cylinder 3.1 that provides bending loading power. The bending loading oil cylinder 3.1 and the lower hinge support 3.9 can rotate relative to each other. The output shaft at the top end of the bending loading oil cylinder 3.1 is fixedly connected with an upper hinge support 3.7. The upper hinge support 3.7 is hinged with a bending fixture body 3.6 through an upper hinge shaft 3.4. The bending fixture body 3.6 can rotate relative to the upper hinge support 3.7. The two rotational pairs formed by the lower hinge support 3.9 and the upper hinge support 3.7 can decouple the axial deformation generated during the test. The top end of the bending fixture body 3.6 is detachably connected with a tensile connecting piece 3.5 through bolts. The change in the specimen diameter can also be adjusted by adding pads inside the bending fixture body 3.6, and the bending test of specimens with different diameters can be realized by using the stroke of the bending loading oil cylinder 3.1. The top end of the oil cylinder mounting seat 3.2 is fixedly connected with an anti-tipping device 3.3. The anti-tipping device 3.3 is composed of two groups of L-shaped clamping plates. The bottom ends of the two groups of L-shaped clamping plates are fixedly connected to the top end of the oil cylinder mounting seat 3.2. The two groups of L-shaped clamping plates are symmetrically arranged on the left and right sides of the bending fixture body 3.6 to prevent the bending fixture body 3.6 from tipping over during the process of installing the specimen. A force sensor 3.8 is arranged on the outer periphery of the bending loading oil cylinder 3.1, which can measure the force output by the bending loading oil cylinder 3.1.

[0036] Refer to Figure 5, the passive end fixture 5 includes a bearing base 5.8 that serves as a fixed support. The bottom end of the bearing base 5.8 is fixedly connected to the top end of the slider of the linear guide 2, and its position can be adjusted according to the length of the specimen. The top end of the bearing base 5.8 is fixedly connected with a hinge seat 5.4. Inside the hinge seat 5.4, a hinge shaft 5.1 is fixedly connected through a right bearing 5.2. The hinge shaft 5.1 is connected to the hinge seat 5.4 through the right bearing 5.2 to form a revolute pair, which enables the specimen to deform freely when subjected to a bending load. A passive fixture body 5.3 is fixedly connected to the outer periphery of the hinge shaft 5.1. The upper and lower ends of the passive fixture body 5.3 are detachably connected with a right fixture cover plate 5.6 by bolts, enabling the passive fixture body 5.3 to bear torsional loads. A fastening screw rod 5.5 is slidably connected inside the hinge seat 5.4. A double wedge pad 5.9 is slidably connected to the outer periphery of the fastening screw rod 5.5. The bottom end of the double wedge pad 5.9 is placed on the top end of the bearing base 5.8. The lower part of the fastening screw rod 5.5 is threadedly connected to the top end of the bearing base 5.8, and the upper part of the fastening screw rod 5.5 is fixed to the top end of the hinge seat 5.4 with a nut. During the bending test, when the fastening screw rod 5.5 and the double wedge pad 5.9 are installed, they can bear a large bending load. During the tensile-torsion test, the fastening screw rod 5.5 and the double wedge pad 5.9 are removed, enabling the passive fixture body 5.3, the hinge seat 5.4, and the specimen to rotate. A right elastic support 5.7 is fixedly connected to the top end of the bearing base 5.8, which is used to support the passive fixture body 5.3 when loading and unloading the specimen.

[0037] Refer to Figure 4 , the sand control screen pipe 4 includes a sand control screen pipe specimen 4.1. The outer periphery of the sand control screen pipe specimen 4.1 is detachably connected inside the bending fixture body 3.6. Both ends of the sand control screen pipe specimen 4.1 are fixedly connected with fixture flanges 4.2, and the fixture flanges 4.2 can be reused. The connection form between the sand control screen pipe specimen 4.1 and the fixture flanges 4.2 is welding. The outer periphery of the right fixture flange 4.2 is detachably connected inside the passive fixture body 5.3, and the outer periphery of the left fixture flange 4.2 is detachably connected inside the active fixture body 1.4, fixing the sand control screen pipe specimen 4.1. During welding, it is necessary to ensure that the cylindrical parts of the two groups of fixture flanges 4.2 are coaxial and the method flange parts of the two groups of fixture flanges 4.2 are parallel. The upper and lower ends of the left fixture flange 4.2 are in contact with the left fixture cover plate 1.6, and the upper and lower ends of the right fixture flange 4.2 are in contact with the right fixture cover plate 5.6, enabling the specimen to bear both tensile and compressive loads, torsional loads, and bending loads.

[0038] Working principle: When conducting a combined load test on the sand control screen specimen 4.1, first install the sand control screen specimen 4.1 inside the bending fixture body 3.6, then install the fixture flanges 4.2 at both left and right ends inside the active fixture body 1.4 and the passive fixture body 5.3, and finally complete the fixation by installing the left fixture cover plate 1.6 and the right fixture cover plate 5.6. Turn on the main machine force application mechanism to push or stretch the active end fixture 1 to the right, apply tensile and compressive loadings to the sand control screen 4. At the same time, the machine torque application mechanism can be turned on to drive the passive end fixture 5 to rotate and apply torsional loadings to the sand control screen 4. Turn on the bending loading oil cylinder 3.1, and the output shaft at the top of the bending loading oil cylinder 3.1 pushes the upper hinge support 3.7 upward to push the sand control screen 4 and apply bending loadings to the sand control screen 4. At the same time, the two rotational pairs formed by the lower hinge support 3.9 and the upper hinge support 3.7 can decouple the axial deformation generated during the test. The active end fixture 1 decouples the axial deformation generated during the test through the rotational pair formed by connecting the left bearing 1.3 and the hinge support 1.1. The passive end fixture 5 can freely deform when the specimen is subjected to bending loadings through the rotational pair formed by connecting the right bearing 5.2 and the hinge seat 5.4, achieving the decoupling of the bending loadings, so that multiple load tests can be loaded simultaneously, enabling the test to simulate the actual working condition loadings of the sand control screen 4 and the completion tool in the wellbore and improving the accuracy of the test.

[0039] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A composite tension-torsion-bending fixture for testing the general mechanical properties of a sand control screen, comprising an active end fixture (1), characterized in that: The bottom end of the active end fixture (1) is slidably connected to a linear guide rail (2), the top end of the slider of the linear guide rail (2) is slidably connected to a bending fixture (3), the top end of the slider of the linear guide rail (2) is slidably connected to a passive end fixture (5), the inside of the bending fixture (3) is fixedly connected to a sand control screen pipe (4), one end of the sand control screen pipe (4) is fixedly connected to the right side of the active end fixture (1), the other end of the sand control screen pipe (4) is fixedly connected to the left side of the passive end fixture (5), and the right side of the passive end fixture (5) is fixedly connected to a static pressure bearing (6).

2. A tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipes according to claim 1, characterized in that: The active end clamp (1) comprises an articulated support (1.1), the bottom end of the articulated support (1.1) is fixedly connected to the top end of the slider of the linear guide rail (2), the interior of the articulated support (1.1) is rotatably connected to a left articulated shaft (1.2) via a left bearing (1.3), the outer periphery of the left articulated shaft (1.2) is fixedly connected to an active clamp body (1.4), the upper and lower sides of the active clamp body (1.4) are detachably connected to a left clamp cover plate (1.6) via screws, and the top end of the base of the articulated support (1.1) is fixedly connected to a left elastic support (1.5).

3. The tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipe according to claim 1, characterized in that: The bending fixture (3) comprises a cylinder mounting seat (3.2), the bottom end of the cylinder mounting seat (3.2) is fixedly connected to the top end of the slider of the linear guide rail (2), the bottom end of the cylinder mounting seat (3.2) is fixedly connected to a lower hinge support (3.9), the outer periphery of the lower hinge support (3.9) is fixedly connected to a bending loading cylinder (3.1), the top output shaft of the bending loading cylinder (3.1) is fixedly connected to an upper hinge support (3.7), the upper hinge support (3.7) is hinged to a bending clamp body (3.6) through an upper hinge shaft (3.4), the top end of the bending clamp body (3.6) is detachably connected to a tensile connector (3.5) through bolts, the top end of the cylinder mounting seat (3.2) is fixedly connected to an anti-tilting device (3.3), and a force sensor (3.8) is arranged on the outer periphery of the bending loading cylinder (3.1).

4. A tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipes according to claim 3, characterized in that: The anti-tilt device (3.3) is composed of two groups of L-shaped clamps, the bottom ends of the two groups of L-shaped clamps are fixedly connected to the top of the oil cylinder mounting seat (3.2), and the two groups of L-shaped clamps are symmetrically arranged on the left and right sides of the curved clamp body (3.6).

5. The tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipe according to claim 1, characterized in that: The passive end clamp (5) comprises a bearing base (5.8), the bottom end of the bearing base (5.8) is fixedly connected to the top end of the slider of the linear guide rail (2), the top end of the bearing base (5.8) is fixedly connected to a hinge seat (5.4), the hinge seat (5.4) is fixedly connected to a hinge shaft (5.1) via a right bearing (5.2), the hinge shaft (5.1) is fixedly connected to a passive clamp body (5.3) at its periphery, the passive clamp body (5.3) is detachably connected to a right clamp cover plate (5.6) at its upper and lower ends via bolts, the hinge seat (5.4) is slidably connected to a fastening screw (5.5), the fastening screw (5.5) is slidably connected to a double wedge pad (5.9), and the top end of the bearing base (5.8) is fixedly connected to a right elastic support (5.7).

6. A tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipes according to claim 5, characterized in that: The bottom end of the double wedge pad (5.9) is placed on the top end of the bearing base (5.8), the lower part of the fastening screw (5.5) is threadedly connected to the top end of the bearing base (5.8), and the upper part of the fastening screw (5.5) is threadedly fixed to the top end of the hinge seat (5.4) by a nut.

7. The tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipe according to claim 1, characterized in that: The sand control screen pipe (4) comprises a sand control screen pipe sample (4.1), the outer periphery of the sand control screen pipe sample (4.1) is detachably connected to the inside of a bending clamp body (3.6), and clamp flanges (4.2) are fixedly connected to both ends of the sand control screen pipe sample (4.1), the outer periphery of the right clamp flange (4.2) is detachably connected to the inside of a passive clamp body (5.3), and the outer periphery of the left clamp flange (4.2) is detachably connected to the inside of an active clamp body (1.4).

8. The tensile-torsion-bending composite fixture for general mechanical property testing of sand control screen pipe according to claim 7, characterized in that: The cylindrical parts of the two sets of clamp flanges (4.2) are coaxial, the flange parts of the two sets of clamp flanges (4.2) are parallel, the upper and lower ends of the left clamp flange (4.2) are in contact with the left clamp cover (1.6), and the upper and lower ends of the right clamp flange (4.2) are in contact with the right clamp cover (5.6).

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