Stress ring loading device for hydrogen sulfide stress corrosion test

Abstract

The utility model belongs to the technical field of detection, and particularly relates to a stress ring loading device for a hydrogen sulfide stress corrosion test, which comprises a base, a fixing groove arranged in the middle of the base, a stress ring rack detachably connected in the fixing groove, a stress ring connected to the bottom of the stress ring rack through a bottom bolt, and a loading screw connected to the top of the stress ring. A loading screw is arranged on the base, a loading nut is arranged on the loading screw, a loading bracket fixedly connected with the base is arranged above the stress ring, a socket spanner with adjustable height is arranged on the loading bracket, the socket spanner is connected with the loading bracket through an adjusting screw, a handle is arranged at the top of the adjusting screw, and a dial indicator bracket is fixedly connected with the base. The dial indicator support is movably connected with a dial indicator. According to the utility model, errors caused by loading are reduced, the accuracy of experimental data is improved, and the waste of manpower and material resources caused by repeated experiments is greatly avoided.

Description

Technical Field

[0001] This utility model belongs to the field of detection technology, and specifically relates to a stress ring loading device for hydrogen sulfide stress corrosion testing. Background Technology

[0002] Oil well pipes are specialized pipes used in the oil and gas extraction process. With the development of the petrochemical industry, it has been found that oil well pipes are severely corroded by the complex downhole environment (hydrogen sulfide, carbon dioxide gas, and chloride ions, etc.), and hydrogen sulfide corrosion is receiving increasing attention.

[0003] To ensure the safe use of oil well tubing in oil and gas wells, major oil and gas fields worldwide widely adopt the oil casing and drill pipe specifications developed by the National Association of Corrosion Engineers (NACE). These specifications specify requirements for the production, composition, and performance of oil well tubing materials. Furthermore, they recommend using the NACE™ 0177-2016 standard for hydrogen sulfide stress corrosion testing, utilizing the linear relationship between stress ring deformation and force to achieve constant load application on the specimen.

[0004] However, several problems were discovered during the testing using stress rings: for example, the stress ring shifted position due to stress during loading, causing errors; radial forces were also easily generated during loading, contributing to errors; and the accuracy of the readings was affected by whether the dial indicator was completely fixed. Using a conventional wrench, uneven force application could easily lead to overload. These combined factors resulted in large errors and a tendency to overload in the existing stress ring loading device, directly causing significant dispersion in the test results. This often necessitated repeatable tests, which, with a test cycle of up to 720 hours, resulted in a substantial waste of manpower and resources. Therefore, improving the existing stress ring loading device is essential.

[0005] Patent CN115718030A discloses an automatic stress ring load loading and online monitoring device, comprising: a frame, a transmission and pressurizing mechanism, and a stress ring positioning plate. The stress ring positioning plate is horizontally positioned at the bottom of the frame. The transmission and pressurizing mechanism is located inside the frame and vertically positioned above the stress ring positioning plate. The transmission and pressurizing mechanism includes: a stepper motor, a synchronous belt drive mechanism, a vertical drive mechanism, and a connecting pressurizing mechanism. The stepper motor is fixedly mounted on the upper part of the frame and connected to one end of the synchronous belt drive mechanism. The other end of the synchronous belt drive mechanism is connected to the vertical drive mechanism. The vertical drive mechanism is vertically rotatably mounted on the upper part of the frame. The connecting pressurizing mechanism is fixedly mounted at the lower end of the vertical drive mechanism and contacts the stress ring to be measured. This invention achieves load loading of 0.1-40KN through a simplified structure. The device primarily focuses on the automatic loading and online monitoring of stress rings, achieving effective control of the load. However, it does not address how to reduce errors during stress ring loading or improve loading accuracy.

[0006] Patent CN207423676U discloses a stress ring calibration device for hydrogen sulfide stress corrosion testing. The device includes a deformable stress ring and a base. The base comprises a flat, parallel upper surface and a lower surface. The bottom end of the deformable stress ring is fixed to the base, with its diameter perpendicular to the base surface. A sample clamp and a dial indicator are fixed to the top of the deformable stress ring, with the dial indicator arranged vertically downwards as a probe. A vertical auxiliary plate is fixed to the base parallel to the deformable stress ring, with a zero-position limiting piece on the top of the auxiliary plate near the deformable stress ring. This testing device allows for rapid stress calibration using a universal testing machine, exhibiting strong adaptability to substandard environments. It is simple and quick, adaptable to vibration environments, allows for real-time reading and measurement, and records test values ​​at stable points. Dust and other impurities have virtually no impact on the accuracy of the device, allowing for stress calibration anytime, anywhere, regardless of the environment. This device primarily focuses on the stress ring calibration of hydrogen sulfide stress corrosion testing, enabling stress calibration anytime, anywhere, regardless of the environment. It also did not mention how to reduce the errors that exist during the stress ring loading process and improve the loading accuracy. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide a stress ring loading device for hydrogen sulfide stress corrosion testing, which reduces the error caused by loading and improves the accuracy of experimental data.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A stress ring loading device for hydrogen sulfide stress corrosion testing includes a base with a fixing groove in the middle. A stress ring stand is detachably connected to the fixing groove. A stress ring is connected to the bottom of the stress ring stand via a bottom bolt. A loading screw is connected to the top of the stress ring, and a loading nut is provided on the loading screw. A loading bracket is fixedly connected to the base above the stress ring. A height-adjustable socket wrench is provided on the loading bracket. The socket wrench is connected to the loading bracket via an adjusting screw, and a handle is provided on the top of the adjusting screw. A dial indicator bracket is fixedly connected to the base, and a dial indicator is movably connected to the dial indicator bracket.

[0010] The bottom surface of the fixed groove is provided with a groove bottom threaded hole, and the stress ring frame is connected to the groove bottom threaded hole by bolts.

[0011] The socket wrench is matched with the loading nut.

[0012] The base has positioning through holes at its four corners.

[0013] The loading bracket includes a crossbeam, with both ends of the crossbeam connected to the base via columns, and the middle of the crossbeam connected to the base via a support frame.

[0014] Compared with existing technologies, the beneficial effects of this utility model are:

[0015] This invention utilizes an adjustable screw for loading, ensuring that only axial force is applied during the loading process, eliminating errors caused by interference from forces in other directions. Furthermore, the threaded transmission of the loading force is less prone to overload. The fixing groove on the base secures the stress ring, reducing errors caused by stress ring displacement. A separate dial indicator bracket further minimizes errors caused by dial indicator displacement.

[0016] This invention reduces errors caused by loading, improves the accuracy of experimental data, and greatly avoids the waste of manpower and resources caused by repeated experiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2 This is a top view of the present invention.

[0019] In the diagram: 1. Base; 2. Fixing groove; 3. Stress ring stand; 4. Stress ring; 5. Loading bracket; 6. Socket wrench; 7. Adjusting screw; 8. Handle; 9. Dial indicator bracket; 10. Dial indicator; 11. Bottom bolt; 12. Loading bolt; 13. Loading nut; 14. Positioning through hole; 15. Threaded hole at the bottom of the groove; 51. Crossbeam; 52. Column; 53. Support frame. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1-2A stress ring loading device for hydrogen sulfide stress corrosion testing includes a base 1, a fixing groove 2 in the middle of the base 1, a stress ring frame 3 detachably connected in the fixing groove 2, a stress ring 4 connected to the bottom of the stress ring frame 3 by a bottom bolt 11, a loading screw 12 connected to the top of the stress ring 4, a loading nut 13 on the loading screw 12, a loading bracket 5 fixedly connected to the base 1 above the stress ring 4, a height-adjustable socket wrench 6 on the loading bracket 5, the socket wrench 6 connected to the loading bracket 5 by an adjusting screw 7, a handle 8 on the top of the adjusting screw 7, a dial indicator bracket 9 fixedly connected to the base 1, and a dial indicator 10 movably connected to the dial indicator bracket 9.

[0023] The bottom surface of the fixed groove 2 is provided with a groove bottom threaded hole 15, and the stress ring frame 3 is connected to the groove bottom threaded hole 15 by bolts.

[0024] The socket wrench 6 is matched with the loading nut 13.

[0025] The base 1 has positioning through holes 14 at its four corners. The base 1 can be bolted to the work platform through the positioning through holes 14.

[0026] The loading bracket 5 includes a crossbeam 51, the two ends of which are connected to the base 1 via columns 52, and the middle part of the crossbeam 51 is connected to the base 1 via a support frame 52.

[0027] Work process:

[0028] The test sample is placed in a sulfide test container, which is then installed in the middle of stress ring 4 and connected via a loading screw and a bottom bolt. During the test, the adjusting sleeve wrench 6 is fitted onto the loading nut 13, and the handle 8 is rotated to apply a load to the sample by rotating the loading nut 13. The magnitude of the load is obtained by measuring the deformation of stress ring 4 using a dial indicator 10.

[0029] To make the objectives, technical solutions, and technical effects of this utility model clearer, the technical solutions in the embodiments of this utility model are now described clearly and completely. However, the embodiments described below are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] Example

[0031] A stress ring loading device for hydrogen sulfide stress corrosion testing includes a base 1, the base 1 being an iron plate with dimensions of 400mm*300mm. A fixing groove 2, 300mm*160mm in size and approximately 10mm deep, is provided in the middle of the base 1. A threaded hole 15 is provided on the bottom surface of the fixing groove 2. A stress ring frame 3 is connected to the threaded hole 15 by bolts. A stress ring 4 is connected to the bottom of the stress ring frame 3 via a bottom bolt 11. A loading screw 12 is connected to the top of the stress ring 4, and a loading nut 13 is provided on the loading screw 12. A loading bracket 5, fixedly connected to the base 1, is provided above the stress ring 4. The loading bracket 5 includes a crossbeam 51, the two ends of which are connected to the base 1 via columns 52, and the middle of the crossbeam 51 is connected to the base 1 via a support frame 52.

[0032] A height-adjustable socket wrench 6 is provided on the crossbeam 51. The socket wrench 6 is connected to the loading bracket 5 via an adjusting screw 7. A handle 8 is provided on the top of the adjusting screw 7. The socket wrench 6 is matched with the loading nut 13.

[0033] A dial indicator bracket 9 is fixedly connected to the base 1, and a dial indicator 10 is movably connected to the dial indicator bracket 9. Positioning through holes 14 are provided at the four corners of the base 1.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and basic spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stress ring loading device for hydrogen sulfide stress corrosion testing, characterized by, The base is provided with a fixing groove in the middle part, a stress ring support is detachably connected in the fixing groove, the bottom of the stress ring support is connected with a stress ring through bottom bolts, the top of the stress ring is connected with a loading screw rod, the loading screw rod is provided with a loading nut, a loading support is fixedly connected above the stress ring, a sleeve wrench capable of adjusting height is arranged on the loading support, the sleeve wrench is connected with the loading support through an adjusting screw rod, the top of the adjusting screw rod is provided with a handle, a micrometer support is fixedly connected on the base, and a micrometer is movably connected on the micrometer support; The bottom surface of the fixing groove is provided with a groove bottom threaded hole, and the stress ring support is connected with the groove bottom threaded hole through bolts; The sleeve wrench is matched with the loading nut; The base is provided with positioning through holes at four corners; The loading support comprises a cross beam, the two ends of the cross beam are connected with the base through stand columns, and the middle part of the cross beam is connected with the base through a support frame.

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