Three-point bending and four-point bending integrated loading device for oil and gas well environment

Abstract

The utility model relates to a three-point bending and four-point bending integrated loading device for an oil and gas well environment. The three-point bending and four-point bending integrated loading device comprises a loading clamp, a loading block, a ceramic loading roller, a deflectometer and a fixing device, the loading clamp is made of C276 hastelloy, a loading cavity is arranged inside the loading clamp, a cavity for placing a loading block is arranged in the middle of the loading clamp, a through hole for a deflection meter thimble to pass through is arranged at the bottom of the loading clamp, semicircular grooves are respectively arranged on the left and the right of the loading clamp, and a threaded through hole and two limiting holes are arranged at the top of the loading clamp. The loading blocks are made of the same material, and three grooves with the same diameter are formed in the lower portions of the loading blocks and used for containing the ceramic loading rollers. The fixing device is formed by welding a vertical metal plate and a horizontal metal plate and is used for fixing the loading clamp and the deflectometer. Three-point bending tests and four-point bending tests are achieved through one loading block, the structure is compact, corrosion resistance is achieved, deformation is small, and the device is suitable for material testing in the high-temperature and high-pressure stress corrosion environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of loading devices for oil and gas well environment, in particular to a kind of loading device integrated three-point bending, four-point bending two different loading modes. BACKGROUND

[0002] Under the oil and gas well environment, metal material is prone to stress corrosion cracking in high temperature and high pressure and corrosive medium. Three-point bending and four-point bending are commonly used methods for testing material stress corrosion resistance, and each has its own advantages. Three-point bending fixture is simple;While four-point bending forms a uniform stress zone between the loading points, the results are more accurate and repeatable.

[0003] However, the common stress corrosion loading fixture in the prior art can usually only perform three-point bending and four-point bending tests on different fixtures, and there are few technologies that integrate these two loading methods into one fixture. Although there are some experimental technologies, for example, the Chinese utility model patent with publication number CN 112378780 B discloses "a composite material three-point / four-point bending fatigue test method and device", which can perform three-point bending or four-point bending experiments on the same fixture, but the loading roller is easy to slide along the slide rail when loading stress, and the stability is poor. In addition, for the research and development experiments of new stress corrosion resistant materials, the existing technology has the problem that the fixture material cannot withstand harsh corrosive environments, which is not conducive to the pilot experiments for developing new materials.

[0004] Therefore, it is necessary to study a small fixture that integrates three-point bending and four-point bending to overcome the shortcomings of the prior art and solve existing problems. UTILITY MODEL CONTENT

[0005] Based on the above background, the utility model provides a fixture that integrates three-point bending and four-point bending, has high stability and is resistant to stress corrosion, and the specific technical scheme is as follows:

[0006] The present application provides a three-point bending and four-point bending integrated loading device for oil and gas well environment, comprising a loading fixture, a deflection meter and a fixing device.

[0007] The loading fixture is made of C276 Hastelloy alloy to prevent corrosion of the fixture in the high-temperature and high-pressure environment; the loading fixture is internally provided with a loading cavity in which the sample to be tested is fixed and tested; the loading fixture is provided in the middle with a cavity for placing a loading block, and the cavity width is the same as the loading block width; the loading fixture is provided at the bottom with a through hole for passing a deflection gauge needle, and the diameter of the through hole is slightly larger than the maximum diameter of the deflection gauge probe; the loading fixture is provided on the left and right with a semicircular groove for placing a ceramic supporting roller, and the radius of the semicircular groove is the same as that of the ceramic loading roller; the loading fixture is provided at the top with a threaded through hole in the middle, and a loading bolt is screwed into the threaded through hole to press against the loading block to load the sample to be tested; the loading fixture is provided on the left and right at the top with a limiting hole for fixing the loading fixture on a fixing device.

[0008] Further, the deflection gauge is a standard dial gauge, which includes a gauge body and a test probe, and the gauge body is fixed on the fixing device, and the test probe is fixedly connected with the gauge body.

[0009] Further, the fixing device is a vertically placed metal plate, and the bottom of the fixing device is connected with a horizontally placed metal plate by welding; the middle of the fixing device is also provided with two through holes corresponding to the two through holes on the loading fixture, and the loading fixture is fixed on the fixing device by two bolts; the middle and lower part of the fixing device is provided with a through hole for fixing the deflection gauge.

[0010] Further, the ceramic loading roller (the same as the ceramic supporting roller) is made of ceramic material, which can not only prevent galvanic corrosion with the sample to be tested, but also effectively prevent deformation under stress, thereby affecting the accuracy of the experiment; the ceramic loading roller (the same as the ceramic supporting roller) is in a cylindrical structure, and is placed in the pre-set groove of the loading block and the loading fixture during work, and is fixed by the loading block (or the loading fixture) and the sample to be tested through increased deflection.

[0011] Further, the loading block is made of the same C276 Hastelloy alloy material as the loading fixture; the lower part of the loading block is provided with three grooves with the same diameter for placing the ceramic loading roller (the same as the ceramic supporting roller).

[0012] Further, the deflection gauge has a measuring range of 0-12.7mm and an accuracy of 0.001mm, which is suitable for most scenes.

[0013] Compared with the prior art, the utility model has the advantages and effects that: 1, the utility model effectively integrates three -point bending, four -point bending two loading modes in the same fixture in anti -stress corrosion test, and need not to change different loading block, effectively control the cost of possible preparation more fixture;2, the utility model optimizes the structure of prior art, and the overall design size of fixture is small and compact, and the deformation under the loading of larger stress is lower than traditional fixture, greatly improves the stability of experiment;3, the utility model fixture, loading block and loading bolt adopt C276 hastelloy alloy manufacturing, can carry out high temperature and high pressure stress corrosion test under harsh environment. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the schematic diagram of the utility model specific working state;

[0015] Figure 2 It is the three -dimensional schematic diagram of the utility model device whole;

[0016] Figure 3 It is the schematic diagram of the loading fixture of the utility model;

[0017] Figure 4 It is the schematic diagram of the fixing device of the utility model;

[0018] Figure 5 It is the schematic diagram of the deflection meter of the utility model;

[0019] In the drawing, 1 is loading fixture, 2 is loading block, 3 is loading bolt, 4 is the sample to be tested, 5 is limit bolt, 6 is ceramic support roller, 7 is ceramic loading roller, 8 is deflection meter thimble, 9 is deflection meter, 10 is fixing device, 11 is fixing device base, 12 is limit hole, 13 is limit hole, 14 is deflection meter fixed hole. DETAILED DESCRIPTION

[0020] The application will be described in detail below in combination with the drawings and specific embodiments.

[0021] As Figure 1 shown, the utility model mainly includes loading fixture 1, loading block 2, loading bolt 3, fixing device 10 and deflection meter 9;The loading fixture 1 is equipped with a cavity, is used for loading work to the sample to be tested;The loading fixture 1 top is equipped with a threaded hole, and loading bolt 3 passes through the threaded hole and stops loading block 2;The loading block 2 lower part is the radian after calculation, to prevent three -point bending when loading block and the sample to be tested contact;There are three limit grooves, the middle is the placement position of loading roller when three -point bending work, and the two sides are the placement position of loading roller when four -point bending work;The loading block;As Figure 3 , the loading fixture 1 top is equipped with two limit holes 12, is used for loading fixture 1 is fixed in fixing device 10.

[0022] Specific implementation of three-point bending test, first, the loading fixture 1 is fixed by limiting bolt 5 in the fixed device 10, and the loading bolt 3 is screwed to the initial state; Secondly, the ceramic loading roller 7 is placed in the middle of the loading block, and the ceramic support roller 6 is placed in the limiting groove on both sides of the loading fixture 1; The sample to be tested 4 is placed in the cavity of the loading fixture 1, and the loading bolt 3 is slightly screwed to gently touch the sample to be tested 4; The deflection meter 9 is fixed in the fixed hole 14, and the deflection meter test needle 8 is placed in the reserved needle through hole, ensuring that the needle 8 touches the sample to be tested 4 and the deflection meter 9 degree is 0; Finally, the loading bolt 3 is screwed to the deflection meter 9 to show the required deflection value.

[0023] So far, the three-point bending loading work is completed, then the loading fixture is taken out from the fixed device together with the sample to be tested, and is placed in the required environment to carry out high temperature and high pressure stress corrosion test.

[0024] Specific implementation of four-point bending test, the only thing to note is that only one ceramic loading roller 7 is added and placed in the limiting groove on both sides of the loading block 2, and the rest of the steps are the same as the three-point bending implementation steps, which is one of the advantages of the utility model.

[0025] So far, the four-point bending loading work is completed, then the loading fixture is taken out from the fixed device together with the sample to be tested, and is placed in the required environment to carry out high temperature and high pressure stress corrosion test.

[0026] The above is only the preferred embodiment of the present application, not any limitation on the present application, any simple modification, change and equivalent structure change according to the technical essence of the present application to the above embodiment, still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A three-point bending, four-point bending integrated loading device for oil and gas well environments, characterized by, The utility model relates to a loading fixture, a deflection gauge and a fixing device, and belongs to the technical field of material testing. The loading fixture is made of C276 hastelloy, has a loading cavity inside, a cavity for placing a loading block in the middle, a through hole for a deflection gauge needle in the bottom, a semicircular groove on the left and right, a threaded hole in the middle of the top, and a limiting hole on the left and right. The deflection gauge comprises a gauge body and a testing needle, and the gauge body is fixed on the fixing device. The fixing device is a vertical metal plate, and the bottom is connected to a horizontal metal plate through welding. The top of the fixing device has two through holes corresponding to the two through holes of the loading fixture, and the loading fixture is fixed on the fixing device through two bolts. The ceramic loading roller is made of ceramic material and has a cylindrical structure.

2. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The loading block is made of the same C276 hastelloy material as the loading fixture, and the lower part has three grooves with the same diameter for placing the ceramic loading roller.

3. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The ceramic loading roller has a cylindrical structure.

4. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The deflection gauge has a measuring range of 0-12.7 mm and an accuracy of 0.001 mm.

5. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The loading cavity of the loading fixture is used for loading the sample to be tested.

6. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The top of the loading fixture has a threaded hole, and the loading bolt passes through the threaded hole and presses against the loading block.

7. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The lower part of the loading block has a calculated arc to prevent the loading block from contacting the sample to be tested when three-point bending or four-point bending is performed.

8. The three-point bending, four-point bending integrated loading device for oil and gas well environment according to claim 1, characterized in that, The loading block has three limiting grooves, and the middle is the placement position of the loading roller when three-point bending is performed, and the two sides are the placement positions of the loading roller when four-point bending is performed. The top of the loading fixture has two limiting holes for fixing the loading fixture on the fixing device.

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