Underground material stress corrosion test device

Abstract

The utility model relates to the technical field of stress corrosion tests, in particular to a stress corrosion test device for underground materials. Comprising a frame, a loading bolt and a sample, the frame is internally provided with a test groove, the test groove is communicated with the outside, the sample is installed in the test groove, the frame is in threaded connection with the loading bolt, the loading bolt extends into the test groove and abuts against the sample, and the loading bolt is in threaded connection with the test groove. The loading bolt is used for applying a required load to the sample; the test sample is installed in the frame, the frame and the test sample are directly put into the well, the test sample also has the needed load, the test sample is a metal material such as a metal oil pipe, a sleeve, a downhole tool, a ground pipeline and ground equipment which are commonly used in an oil field, and the test result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of stress corrosion testing, in particular to a stress corrosion testing device for underground materials. Background Art

[0002] As most oilfields enter the ultra-deep and ultra-high temperature stage, the material of the oil pipes is mostly high-strength steel. The ultra-deep oil wells in the western oilfields put the oil pipes in a high-load state during operation. At the same time, crude oil is rich in acidic gases such as H2S / CO2 and highly corrosive chloride ions, which will cause serious corrosion perforation and even fracture of steel oil pipes, affecting their service life. At present, in the evaluation of the sensitivity of material stress corrosion cracking, due to the narrow operating space in the oil pipe, the complex structure of the conventional stress corrosion device, and the parts are not conducive to the deployment of the conventional stress corrosion cracking evaluation device, the conventional corrosion hanging plate method is mainly used, but the conventional corrosion hanging plate method cannot accurately simulate the stress state corresponding to the load of the material.

[0003] Prior art CN210513920U discloses a constant strain stress corrosion test device that can simulate the on-site corrosion environment, including a sealed kettle assembly and a reaction assembly, the sealed kettle cover is fixed to the sealed kettle body by fixing bolts, the sealing platform is sealed by the self-pressure in the sealed kettle body, the sealed kettle is a cylindrical tank body, the sealed kettle body has a corrosion test cavity, the signal line sealing barrel has a sealing filler and is connected to the sealing platform by a thread, the curved arc sample is placed in the test medium in the corrosion test cavity, the curved arc sample and the loading screw are respectively attached with a data strain gauge and a judgment strain gauge, the strain gauge lead connects the data strain gauge or the judgment strain gauge to the external signal line, and the external signal line is connected to the strain gauge through the signal line sealing barrel. The above device is a stress corrosion test on the downhole material by simulating the downhole corrosion environment, and the downhole material to be tested is not directly placed in the actual downhole environment for testing, and the test results may be biased.

[0004] Therefore, there is an urgent need to provide a downhole material stress corrosion testing device to improve the accuracy of the test results compared with the existing technology. Utility Model Content

[0005] The utility model solves the technical problems existing in the prior art and provides a stress corrosion test device for underground materials.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A downhole material stress corrosion test device comprises a frame, a loading bolt and a sample. A test groove is provided inside the frame, the test groove is communicated with the outside, the sample is installed in the test groove, the loading bolt is threadedly connected to the frame, the loading bolt extends into the test groove, the loading bolt abuts against the sample, and the loading bolt is used to apply a load to the sample.

[0008] Furthermore, a conical groove is provided on the lower wall of the sample, and the loading bolt abuts against the side wall of the conical groove.

[0009] Furthermore, the loading bolt includes a screw rod and a head, the screw rod and the head are integrally connected, and the head abuts against the inner wall of the tapered groove.

[0010] Furthermore, the head is in a truncated cone shape, and the large diameter end of the head is connected to the screw.

[0011] Furthermore, the angle between the head side wall and the head axis is a first angle, the angle between the tapered groove side wall and the tapered groove axis is a second angle, and the first angle and the second angle are the same.

[0012] Furthermore, the loading bolt also includes a handle, and one end of the screw rod away from the head is fixedly connected to the handle.

[0013] Furthermore, a threaded hole is provided on the lower wall of the frame, and the screw is threadedly connected in the threaded hole.

[0014] Furthermore, the frame is horizontally penetrated with a through hole, and the through hole and the threaded hole are located at the upper and lower ends of the frame.

[0015] Furthermore, a rectangular groove is provided on the inner wall of the test groove, and a convex block is provided on the upper wall of the sample, and the convex block is installed in the rectangular groove.

[0016] Furthermore, the frame and the loading bolts are both made of titanium alloy corrosion-resistant insulating hard material.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The utility model installs the sample in the frame, directly lowers the frame and the sample into the well, and also has the required load on the sample. The sample is a metal material commonly used in oil fields, such as metal oil pipes, casings, downhole tools, ground pipelines, ground equipment, etc., and the test results are more accurate.

[0019] (2) The utility model has low cost, simple structure, easy on-site implementation, high strength and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Description of reference numerals:

[0022] 1. Test specimen; 11. Conical groove; 12. Bump; 2. Frame; 21. Through hole; 22. Test groove; 23. Rectangular groove; 24. Threaded hole; 3. Loading bolt; 31. Head; 32. Screw; 33. Handle. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0024] like Figure 1 As shown, the utility model provides an underground material stress corrosion test device, including a frame 2, a loading bolt 3 and a sample 1. A test groove 22 is provided inside the frame 2, and both ends of the test groove 22 are connected to the outside in a horizontal direction. The sample 1 is installed in the test groove 22, and the loading bolt 3 is threadedly connected to the frame 2. The loading bolt 3 extends into the test groove 22, and the loading bolt 3 abuts against the sample 1. The loading bolt 3 is used to apply a required load to the sample 1.

[0025] A through hole 21 is provided above the frame 2, and the through hole 21 is horizontally penetrated through the frame 2, and the through hole 21 is used to fix the entire device on the lowering device; a rectangular groove 23 is provided on the side wall of the test groove 22 close to the through hole 21, and the sample 1 is installed in the rectangular groove 23, and the upper wall of the sample 1 is integrally connected with a protrusion 12, and the shape of the protrusion 12 is adapted to the shape of the rectangular groove 23. The sample 1 is installed in the rectangular groove 23 through the protrusion 12, and the protrusion 12 and the rectangular groove 23 are connected by a snap-fit ​​manner.

[0026] The loading bolt 3 includes a head 31, a screw rod 32 and a handle 33. One end of the screw rod 32 is integrally connected to the head 31, and the other end of the screw rod 32 is integrally connected to the handle 33. The head 31 and the screw rod 32 are coaxially arranged, and the handle 33 is arranged perpendicular to the axis of the screw rod 32. A threaded hole 24 is provided on the lower wall of the frame 2. One end of the threaded hole 24 is connected to the outside, and the other end of the threaded hole 24 is connected to the test groove 22. The screw rod 32 is provided with an external thread. The screw rod 32 is arranged through the threaded hole 24, and the screw 32 is threadedly connected to the frame 2 through the threaded hole 24. The head 31 is truncated cone-shaped, and the large diameter end of the head 31 is integrally connected to the screw rod 32.

[0027] A conical groove 11 is provided at one end of the sample 1 away from the protrusion 12, and the conical groove 11 is coaxially arranged with the sample 1. The angle between the side wall of the head 31 and the axis of the head 31 is set to be a first angle, and the angle between the side wall of the conical groove 11 and the axis of the sample 1 is set to be a second angle. The first angle and the second angle are the same. The head 31 extends into the conical groove 11. After the screw 32 is rotated to make the head 31 move upward, there is a force between the side wall of the head 31 and the side wall of the conical groove 11, so that the required load is applied to the sample 1 through the head 31. The size of the load applied to the sample 1 is determined by the number of turns of the screw 32.

[0028] The thickness of frame 2 is 15 mm, and the thickness of sample 1 is 5 mm. Sample 1 is made of metal materials such as metal oil pipes, casings, downhole tools, ground pipelines, and ground equipment commonly used in oil fields; frame 2 and loading bolts 3 are both made of titanium alloy corrosion-resistant insulating hard materials that have undergone micro-arc oxidation surface treatment, and can be titanium alloys that have undergone micro-arc oxidation surface treatment.

[0029] The utility model provides a downhole material stress corrosion test device with a working principle as follows: a sample 1 corresponding to the downhole material to be tested is installed inside a rectangular groove 23, a loading bolt 3 is screwed into a threaded hole 24, and a head 31 of the loading bolt 3 is extended into a tapered groove 11 of the sample 1, so that the side wall of the head 31 contacts the inner wall of the tapered groove 11 but there is no interaction force, and then the loading bolt 3 is rotated by a handle 33 to a set number of turns, at which time the required load has been applied to the sample 1, and then the frame 2 is fixed to the lowering device through the through hole 21, the lowering device is started to put the entire device into the well, and after a certain period of time, the entire device is taken out of the well to evaluate its corrosion degree, the lowering device is an oil well downhole sampler, and the oil well downhole sampler is connected to the through hole 21 by bolts.

[0030] The utility model has the advantages of low cost, simple structure, easy on-site implementation, high strength and corrosion resistance, and can directly lower the sample 1 into the well, so that the test result is more accurate.

[0031] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A stress corrosion test device for underground materials, characterized in that: It includes a frame, a loading bolt and a sample. The frame is provided with a test groove inside, the test groove is connected to the outside, the sample is installed in the test groove, the loading bolt is threadedly connected to the frame, the loading bolt extends into the test groove, the loading bolt abuts against the sample, and the loading bolt is used to apply a load to the sample.

2. The downhole material stress corrosion testing device according to claim 1, characterized in that: A conical groove is provided on the lower wall of the sample, and the loading bolt abuts against the side wall of the conical groove.

3. The downhole material stress corrosion testing device according to claim 2, characterized in that: The loading bolt comprises a screw rod and a head, wherein the screw rod is integrally connected with the head, and the head abuts against an inner wall of the tapered groove.

4. The downhole material stress corrosion testing device according to claim 3, characterized in that: The head is in a truncated cone shape, and the large diameter end of the head is connected to the screw.

5. The downhole material stress corrosion testing device according to claim 4, characterized in that: The angle between the head side wall and the head axis is a first angle, the angle between the tapered groove side wall and the tapered groove axis is a second angle, and the first angle and the second angle are the same.

6. The downhole material stress corrosion testing device according to claim 3, characterized in that: The loading bolt also includes a handle, and one end of the screw rod away from the head is fixedly connected to the handle.

7. The downhole material stress corrosion testing device according to claim 3, characterized in that: The lower wall of the frame is provided with a threaded hole, and the screw rod is threadedly connected in the threaded hole.

8. The downhole material stress corrosion testing device according to claim 7, characterized in that: The frame is horizontally penetrated with a through hole, and the through hole and the threaded hole are located at the upper and lower ends of the frame.

9. The downhole material stress corrosion testing device according to claim 1, characterized in that: A rectangular groove is arranged on the inner wall of the test groove, and a convex block is arranged on the upper wall of the sample, and the convex block is installed in the rectangular groove.

10. The downhole material stress corrosion testing device according to claim 1, characterized in that: The frame and the loading bolts are both made of titanium alloy, a corrosion-resistant insulating hard material.

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