High-temperature and high-pressure rock mechanical fracturing test device

Abstract

The utility model discloses a high-temperature high-pressure rock mechanical fracturing test device which comprises a base, a confining pressure structure is arranged on the base, the confining pressure structure comprises a sample bearing table, a steel sleeve and an annular cover body, the sample bearing table is cylindrical and fixedly installed on the base, a lower end opening of the steel sleeve is installed on the sample bearing table in a sleeved mode, and the annular cover body is fixedly installed on the steel sleeve. At least two first sealing structures are arranged between the annular cover body and the sample bearing table, and the annular cover body is fixedly mounted at an upper port of the steel sleeve; a pressing rod capable of moving up and down is arranged in the steel sleeve, the pressing rod penetrates through the annular cover body, at least two second sealing structures are arranged between the pressing rod and the annular cover body, the top of the pressing rod is connected with normal loading equipment, a liquid injection hole is formed in the side wall of the steel sleeve, the liquid injection hole is connected with hydraulic loading equipment, and the outer wall of the steel sleeve is wrapped with a flexible detachable heating sleeve. The mechanical property of the rock under the multi-field coupling effect is analyzed and researched in an auxiliary mode, and the method has important practical significance for preventing accidents and guaranteeing engineering safety development.

Description

Technical Field

[0001] This utility model relates to the field of rock fracturing test technology, and more specifically, to a high-temperature and high-pressure rock mechanical fracturing test device. Background Technology

[0002] In deep mineral resource extraction and underground space development, the environment in which rock masses exist is extremely complex. Rock masses in high-temperature, high-osmotic-pressure, high-stress, and complex hydrochemical environments undergo multi-field coupling effects of temperature-flow-stress-chemistry (THMC). These multi-field coupling effects of rocks are not only relevant to resource and energy fields such as mineral resource development, oil and gas field extraction, and geothermal resource development, but also a key research focus in areas such as water conservancy and hydropower engineering, high-altitude engineering, underground engineering, underground nuclear waste disposal, and deep-buried energy storage. Under high stress, water flow, high temperature, and chemical action, rocks not only undergo coupling effects but also experience changes in their physical and mechanical properties. Therefore, developing a high-temperature, high-pressure rock mechanical fracturing test device to analyze and study the mechanical properties of rocks under multi-field coupling effects is of significant practical importance for preventing accidents and ensuring the safe conduct of engineering projects. Utility Model Content

[0003] The purpose of this utility model is to provide a high-temperature and high-pressure rock mechanical fracturing test device, aiming to solve at least one of the technical problems existing in the prior art. To achieve the above objective, the technical solution adopted is as follows:

[0004] A high-temperature and high-pressure rock mechanics fracturing test device includes a base, a confining pressure structure on the base, the confining pressure structure includes a sample support platform, a steel sleeve and an annular cover. The sample support platform is cylindrical and fixedly installed on the base. The lower end of the steel sleeve is fitted onto the sample support platform and at least two first sealing structures are provided between the steel sleeve and the sample support platform. The annular cover is fixedly installed on the upper end of the steel sleeve.

[0005] A pressure rod is installed inside the steel sleeve that can move up and down. The pressure rod passes through the annular cover and is provided with at least two second sealing structures between it and the annular cover. The top of the pressure rod is connected to the normal loading device. The side wall of the steel sleeve is provided with a liquid injection hole, which is connected to the hydraulic loading device. The outer wall of the steel sleeve is wrapped with a flexible and detachable heating jacket.

[0006] Preferably, the rock sample is placed on the sample support platform by a loading assembly, which includes an upper pressure head, a lower pressure head, and a rubber sleeve. The rock sample is located between the upper pressure head and the lower pressure head, and the upper pressure head, the rock sample, and the lower pressure head form a cylindrical structure, with the rubber sleeve fitted on the cylindrical structure.

[0007] Preferably, the first sealing structure includes a first annular groove disposed on the outer wall of the sample support stage and a first sealing ring installed in the first annular groove.

[0008] Preferably, the second sealing structure includes a second annular groove disposed on the inner wall of the annular cover and a second sealing ring installed in the second annular groove.

[0009] Preferably, the normal loading device is a normal loading hydraulic cylinder.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This invention relates to a high-temperature, high-pressure rock mechanical fracturing test device, which assists in the analysis and study of the mechanical properties of rocks under multi-field coupling effects. This has significant practical implications for preventing accidents and ensuring the safe conduct of engineering projects. Furthermore, the device has a simple structure, is easy to operate, and produces good test results. Attached Figure Description

[0012] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model.

[0014] Figure 2 This is a cross-sectional view of the overall structure of the device of this utility model.

[0015] In the figure: 1. Base; 2. Sample support platform; 3. Steel sleeve; 4. Annular cover; 5. First annular groove; 6. Pressure bar; 7. Second annular groove; 8. Flexible detachable heating jacket; 9. Rock sample; 10. Upper pressure head; 11. Lower pressure head; 12. Rubber sleeve. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0018] like Figures 1 to 2As shown, a preferred embodiment of this utility model provides a high-temperature and high-pressure rock mechanics fracturing test device. The device includes a base 1, which is a disc-shaped structure. A confining pressure structure is provided on the base 1, which includes a sample support platform 2, a steel sleeve 3, and an annular cover 4.

[0019] The sample support platform 2 is cylindrical and vertically fixed on the base 1. The steel sleeve 3 is a tubular structure, with its lower end fitted onto the sample support platform 2. At least two first sealing structures are provided between the steel sleeve 3 and the sample support platform 2. In this embodiment, two first sealing structures are provided at intervals. Each first sealing structure includes a first annular groove 5 provided on the outer wall of the sample support platform 2 and a first sealing ring installed in the first annular groove 5. The inner wall of the steel sleeve 3 is in close contact with the first sealing ring.

[0020] An annular cover 4 is fixedly installed at the upper end of a steel sleeve 3. A pressure rod 6 is movable up and down inside the steel sleeve 3. The pressure rod 6 passes through the annular cover 4 and has at least two second sealing structures between it and the annular cover 4. In this embodiment, two second sealing structures are spaced apart vertically. Each second sealing structure includes a second annular groove 7 on the inner wall of the annular cover 4 and a second sealing ring installed in the second annular groove 7. The outer wall of the pressure rod 6 is in close contact with the second sealing ring. The top of the pressure rod 6 is connected to a normal loading device (not shown in the figure). In this embodiment, the normal loading device is a normal loading hydraulic cylinder, used to apply normal pressure to the pressure rod 6.

[0021] The side wall of the steel sleeve 3 is provided with a liquid injection hole (not shown in the figure). The liquid injection hole is connected to a hydraulic loading device. High-pressure hydraulic oil is injected into the steel sleeve 3 through the hydraulic loading device to generate confining pressure inside the steel sleeve.

[0022] The outer wall of the steel sleeve 3 is wrapped with a flexible and detachable heating sleeve 8, which generates heat when powered on to provide a high-temperature testing environment for the inside of the steel sleeve 3.

[0023] The rock sample 9 is placed on the sample support platform 2 by a loading assembly. The loading assembly includes an upper pressure head 10, a lower pressure head 11, and a rubber sleeve 12. The rock sample 9 is located between the upper pressure head 10 and the lower pressure head 11. The upper pressure head 10, the rock sample 9, and the lower pressure head 11 form a cylindrical structure. The rubber sleeve 12 is fitted on this cylindrical structure to prevent hydraulic oil from corroding the rock sample.

[0024] Conducting high-temperature and high-pressure rock mechanical fracturing tests using the aforementioned equipment, and assisting in the analysis and research of the mechanical properties of rocks under multi-field coupling effects, is of great practical significance for preventing accidents and ensuring the safe progress of engineering projects.

[0025] At the start or end of the test, the steel sleeve can be lifted and separated from the base for easy handling of rock samples.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-temperature, high-pressure rock mechanical fracturing test device, characterized in that, The device includes a base, on which a confining structure is provided. The confining structure includes a sample support platform, a steel sleeve, and an annular cover. The sample support platform is cylindrical and fixedly installed on the base. The lower end of the steel sleeve is fitted onto the sample support platform, and at least two first sealing structures are provided between the steel sleeve and the sample support platform. The first sealing structure includes a first annular groove provided on the outer wall of the sample support platform and a first sealing ring installed in the first annular groove. The annular cover is fixedly installed on the upper end of the steel sleeve. A pressure rod is movable up and down inside the steel sleeve. The pressure rod passes through the annular cover and is provided with at least two second sealing structures between it and the annular cover. The second sealing structure includes a second annular groove provided on the inner wall of the annular cover and a second sealing ring installed in the second annular groove. The top of the pressure rod is connected to the normal loading device. The side wall of the steel sleeve is provided with a liquid injection hole, which is connected to the hydraulic loading device. The outer wall of the steel sleeve is wrapped with a flexible and detachable heating sleeve. The rock sample is placed on the sample support platform by a loading assembly, which includes an upper pressure head, a lower pressure head, and a rubber sleeve. The rock sample is located between the upper pressure head and the lower pressure head. The upper pressure head, the rock sample, and the lower pressure head form a cylindrical structure, and the rubber sleeve is fitted on the cylindrical structure.

2. The high-temperature and high-pressure rock mechanical fracturing test device according to claim 1, characterized in that, The normal loading device is a normal loading hydraulic cylinder.

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