Triaxial rock mechanical testing machine

Abstract

The utility model discloses a triaxial rock mechanical testing machine, which comprises a testing unit, a pressure chamber base, an axial supercharger, a pressure chamber base, a pressure chamber base and an axial supercharger, the pressure chamber cover is coaxially arranged with the axial supercharger, can ascend and descend and is used for sealing the test unit; the gas confining pressure system is used for providing confining pressure for the test sample of the test unit in a sealed state; the test unit comprises a sleeve for filling a sample; a heat conducting filler is arranged between the heating furnace and the sleeve; the cage-shaped cooling system is arranged on the outer side of the heating furnace, and a first sensor and a second sensor are arranged between the cage-shaped cooling system and the heating furnace; the first sensor is axially coupled with the sample and is used for collecting the axial strain of the sample; and the second sensor is radially coupled with the sleeve and is used for collecting the radial strain of the sample. Confining pressure can be provided and deformation measurement can be realized at high temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of physical mechanics testing devices, in particular to a triaxial rock mechanics testing machine. Background Art

[0002] At present, the heating method used by triaxial rock mechanics testing machines is to heat the pressure chamber as a whole, using liquid as the medium for loading confining pressure and transferring heat. However, this method has low heating efficiency and there is currently no liquid medium with a temperature resistance of more than 650°C. The sensor for measuring sample deformation must also be immersed in liquid, which makes measurement difficult. In addition, under high temperature and high pressure conditions, the metal material of the deformation sensor expands and deforms at high temperature, affecting the measurement accuracy.

[0003] Therefore, overcoming the above-mentioned technical problems is a technical problem to be solved urgently in the technical field. Utility Model Content

[0004] In view of the above problems, the utility model provides a triaxial rock mechanics testing machine.

[0005] The purpose of the utility model can be achieved by the following scheme:

[0006] The utility model provides a triaxial rock mechanics testing machine, comprising: a test unit, which is arranged on a pressure chamber base and below an axial booster; a pressure chamber cover, which is coaxially arranged with the axial booster and can be raised and lowered, and is used to seal the test unit; a gas confining pressure system, which is used to provide confining pressure to a sample of the test unit in a sealed state;

[0007] The test unit includes: a sleeve for filling a sample; a heating furnace, with a heat-conductive filler arranged between the sleeve and the heating furnace; a cage-shaped cooling system, which is arranged outside the heating furnace and has a first sensor and a second sensor arranged between the heating furnace; the first sensor is axially coupled to the sample and is used to collect the axial strain of the sample; the second sensor is radially coupled to the sleeve and is used to collect the radial strain of the sample.

[0008] Furthermore, the first sensor includes a chuck arranged on the upper pressure head seat of the sample and four first columns arranged on the lower pressure head seat of the sample; the outer side surface of the chuck is a conical slope, and the first column is provided with a first strain gauge; the conical slope is used to prop open the first column.

[0009] Furthermore, the second sensor includes four push rods and four second columns; the second columns are arranged on the lower pressure head seat, and the second columns are provided with second strain gauges; the push rods transversely pass through the sensor holes on the heating furnace and fit into the outer wall of the sleeve, and the push rods are transversely connected to the second columns.

[0010] Furthermore, the four second columns are evenly distributed at 90° in the circumferential direction of the outer side of the heating furnace.

[0011] Furthermore, the ejector pin is a ceramic ejector pin.

[0012] Furthermore, the gap between the heating furnace and the sleeve is 5 to 10 mm.

[0013] Furthermore, the thermally conductive filler is magnesium oxide powder.

[0014] Furthermore, the confining pressure medium of the gas confining pressure system is an inert gas.

[0015] Furthermore, a resistance wire is arranged inside the heating furnace.

[0016] Furthermore, the casing is a steel pipe.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] The embodiment of the utility model arranges a cage-shaped cooling system outside the heating furnace, the inside of the heating furnace is a high-temperature zone, and the outside of the heating furnace is a low-temperature zone. The first sensor and the second sensor are arranged in the low-temperature zone, so that the measurement accuracy of the sensors can be improved; the pressure chamber cover is used to seal the test unit, and the gas confining pressure system can achieve confining pressure at high temperature; at the same time, the use of thermally conductive fillers can improve the heat transfer efficiency; and the problems of high-temperature confining pressure and deformation measurement at high temperature are solved.

[0019] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The overall structural diagram of a triaxial rock mechanics testing machine provided by an embodiment of the utility model is shown;

[0022] Figure 2 A front view of the test unit and the pressure chamber base provided in the embodiment of the utility model;

[0023] Figure 3 A left side view of the test unit and the pressure chamber base provided by the embodiment of the utility model;

[0024] Figure 4 A schematic diagram of a heating furnace and a sample installation structure provided in an embodiment of the utility model;

[0025] In the figure: 100-test unit, 200-axial booster, 300-pressure chamber base, 310-sealing ring, 320-product collecting port, 400-pressure chamber cover, 500-frame, 101-sample, 102-sleeve, 103-thermal conductive filler, 104-upper pressure head, 105-lower pressure head, 106-upper pressure head seat, 107-lower pressure head seat, 108-heating furnace, 1081-resistance wire, 1082-sensor hole, 109-first sensor, 110-second sensor, 111-cage cooling system. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The present invention provides a triaxial rock mechanics testing machine, comprising: a test unit 100, which is arranged on a pressure chamber base 300 and below an axial booster 200; a pressure chamber cover 400, which is coaxially arranged with the axial booster 200 and can be raised and lowered, and is used to seal the test unit 100; a gas confining pressure system, which is used to provide confining pressure to a sample 101 of the test unit 100 in a sealed state;

[0028] The test unit 100 includes: a sleeve 102 for filling a sample 101; a heating furnace 108, with a heat-conductive filler 103 arranged between the sleeve 102; a cage cooling system 111, which is arranged outside the heating furnace 108, and a first sensor 109 and a second sensor 110 are arranged between the heating furnace 108; the first sensor 109 is axially coupled to the sample and is used to collect the axial strain of the sample 101; the second sensor 110 is radially coupled to the sleeve 102 and is used to collect the radial strain of the sample 101.

[0029] The present application arranges a cage-shaped cooling system outside the heating furnace, wherein the inside of the heating furnace is a high-temperature zone and the outside of the heating furnace is a low-temperature zone, and arranges the first sensor and the second sensor in the low-temperature zone, thereby improving the measurement accuracy of the sensors; adopts a pressure chamber cover to seal the test unit, and the gas confining pressure system can achieve confining pressure at high temperature, while the use of thermally conductive fillers can improve the heat transfer efficiency; and solves the problems of high-temperature confining pressure and deformation measurement at high temperature.

[0030] In conjunction with the accompanying drawings of the specification, the structure and working principle of a triaxial rock mechanics testing machine provided by an embodiment of the utility model are explained.

[0031] In conjunction with the embodiments of the present invention, refer to Figure 1 The triaxial rock mechanics testing machine provided by the embodiment of the utility model includes a test unit 100, an axial booster 200, a pressure chamber base 300, a pressure chamber cover 400, a frame 500, a gas confining pressure system, a temperature control system and a computer control system. The pressure chamber base 300 and the axial booster 200 are arranged on the frame 500, the test unit 100 is fixedly arranged on the pressure chamber base 300 and arranged below the axial booster 200, and the axial booster 200 is used to apply pressure to the sample in the test unit 100.

[0032] The pressure chamber cover 400 is coaxially arranged with the axial supercharger 200, and the pressure chamber cover 400 is arranged to have a lifting function. When the pressure chamber cover 400 descends to cover the pressure chamber base 300, a pressure chamber is formed inside the pressure chamber cover 400, which can realize the sealing of the test unit 100. When the pressure chamber cover 400 seals the test unit 100, the gas confining pressure system is used to provide confining pressure to the sample of the test unit 100 in a sealed state inside the pressure chamber cover 400, and the maximum loading confining pressure reaches 100MPa. In a specific embodiment, the confining pressure medium of the gas confining pressure system is an inert gas, such as argon, which can achieve high temperature confining pressure, such as 650°C. Among them, the computer control system is connected to the gas confining pressure system to control the gas confining pressure system to provide confining pressure.

[0033] In conjunction with the embodiments of the present invention, refer to Figures 2 to 4 The test unit 100 is fixedly connected to the pressure chamber base 300, and the test unit 100 includes a sleeve 102, a thermal conductive filler 103, an upper pressure head 104, a lower pressure head 105, an upper pressure head seat 106, a lower pressure head seat 107, a heating furnace 108, a first sensor 109, a second sensor 110 and a cage cooling system 111.

[0034] When in the assembled state, the sample 101 is filled inside the sleeve 102, the upper pressure head 104 penetrates the sleeve 102 from above to apply pressure to the sample 101, and the lower pressure head 105 penetrates the sleeve 102 from below to apply pressure to the sample 101. The heating furnace 108 is coaxially arranged with the sleeve 102 and arranged on the outer ring of the sleeve 102. A heat-conducting filler 103 is arranged between the heating furnace 108 and the sleeve 102, and the heat-conducting filler 103 can be magnesium oxide powder. Since the inert gas provided by the gas confinement pressure system, such as argon, has a low thermal conductivity, magnesium oxide powder is filled between the heating furnace 108 and the sleeve 102 to increase the heat transfer efficiency. In other secondary embodiments, quartz sand can be selected as the heat-conducting filler 103. Among them, the gap between the heating furnace 108 and the sleeve 102 is 5 to 10 mm. The material of the sleeve 102 is a steel pipe, which can withstand high temperatures.

[0035] A resistance wire 1081 is disposed inside the heating furnace 108 , and heating is performed by the resistance wire 1081 . The temperature of the heating furnace 108 is controlled by a temperature control system.

[0036] The cage cooling system 111 is arranged outside the heating furnace 108, and a first sensor 109 and a second sensor 110 are arranged between the heating furnace 108. Inside the pressure chamber, the cage cooling system 111 is used to cool the ambient temperature of the space outside the heating furnace 108. The inside of the heating furnace 108 is a high temperature zone, and the outside of the heating furnace 108 is a low temperature zone. The first sensor 109 and the second sensor 110 are arranged in the low temperature zone, which can improve the accuracy of sensor measurement. Among them, the cage cooling system 111 is a cage circulating liquid cooling system, which is composed of a liquid cooling pipe. In a specific embodiment, the cage cooling system 111 is cooled by water cooling.

[0037] In conjunction with the embodiments of the present invention, refer to Figure 2 and Figure 3 , the upper pressure head seat 106 is coaxially fixedly connected to the upper pressure head 104, and the lower pressure head seat 107 is coaxially fixedly connected to the lower pressure head 105. The first sensor 109 is axially coupled to the sample 101, and is used to collect the axial strain of the sample 101. The axial coupling is specifically that the first sensor 109 includes a chuck arranged on the upper pressure head seat 106 of the sample 101, and four first columns arranged on the lower pressure head seat 107 of the sample 101; the outer side surface of the chuck is a conical inclined surface, and the first column is provided with a first strain gauge; the conical inclined surface is used to open the first column. When the upper pressure head seat 106 moves downward, the sample 101 is axially compressed, the conical inclined surface on the outer side surface of the chuck moves downward, and the four first columns in contact with the conical inclined surface are opened outward, and the first strain gauge on the first column measures the axial strain.

[0038] The second sensor 110 is radially coupled to the sleeve 102 to collect the radial strain of the sample 101. Specifically, the radial coupling is that the second sensor 110 includes four push rods and four second columns; the second columns are arranged on the lower pressure head seat 107, and the second columns are provided with second strain gauges; the push rods transversely pass through the sensor hole 1082 on the heating furnace 108 to fit the outer wall of the sleeve 102, and the push rods are transversely connected to the second columns. When the sample 101 is axially compressed, the radial deformation of the sample 101 is transmitted to the second strain gauge on the second column through the push rod to complete the radial strain measurement. In a specific embodiment, the push rod is a ceramic push rod, which can withstand high temperatures and is not easy to expand and deform at high temperatures.

[0039] Among them, the four first pillars are evenly distributed at 90° on the circumferential direction of the outer side of the heating furnace 108, the four second pillars are evenly distributed at 90° on the circumferential direction of the outer side of the heating furnace 108, and the first pillars and the second pillars are spaced 45° apart on the circumferential direction of the heating furnace 108, and the first pillars are higher than the second pillars.

[0040] In conjunction with the embodiments of the present invention, refer to Figure 2 A sealing ring 310 and a product collection port 320 are also provided on the pressure chamber base 300. After the pressure chamber cover 400 descends to cover the pressure chamber base 300, the pressure chamber cover 400 and the pressure chamber base 300 are sealed by the sealing ring 310. Since some oil-bearing rocks will produce fluids such as methane, CO2, water, and oil during the heating process, the product collection port 320 is designed. The product collection port 320 can be sealed by a sealing plug.

[0041] In combination with the embodiment of the utility model, the pressure chamber cover 400 is used to seal the test unit 100 to form a pressure chamber; the axial booster 200 applies axial compression force to the sample 101; the temperature control system controls the temperature of the heating furnace 108, for example, loading it to 650°C and maintaining the temperature; the gas confining pressure system can provide confining pressure to the sample 101 at high temperature, and the maximum loading confining pressure can reach 100MPa; the computer control system is connected to the gas confining pressure system to control the gas confining pressure system to provide confining pressure; the cage cooling system 111 cools the pressure chamber space outside the heating furnace 108, the inside of the heating furnace 108 is a high temperature zone, and the outside of the heating furnace 108 is a low temperature zone. The first sensor and the second sensor for measuring deformation are set in the low temperature zone, which can improve the measurement accuracy of the sensor. The problem of high temperature confining pressure and deformation measurement at high temperature is solved.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A triaxial rock mechanics testing machine, characterized in that: include: A test unit (100) is arranged on a pressure chamber base (300) and below an axial booster (200); a pressure chamber cover (400) is coaxially arranged with the axial booster (200) and can be raised and lowered, and is used to seal the test unit (100); and a gas confining pressure system is used to provide confining pressure to a sample of the test unit (100) in a sealed state. The test unit (100) comprises: a sleeve (102) for filling a sample (101); a heating furnace (108), with a heat-conducting filler (103) arranged between the sleeve (102); a cage-shaped cooling system (111), arranged outside the heating furnace (108), with a first sensor (109) and a second sensor (110) arranged between the heating furnace (108); the first sensor (109) is axially coupled to the sample (101) for collecting the axial strain of the sample (101); the second sensor (110) is radially coupled to the sleeve (102) for collecting the radial strain of the sample (101).

2. The testing machine according to claim 1, characterized in that: The first sensor (109) comprises a chuck arranged on an upper pressure head seat (106) of the sample (101) and four first columns arranged on a lower pressure head seat (107) of the sample (101); the outer side surface of the chuck is a conical inclined surface, and the first column is provided with a first strain gauge; the conical inclined surface is used to prop open the first column.

3. The testing machine according to claim 2, characterized in that: The second sensor (110) includes four push rods and four second columns; the second columns are arranged on the lower pressure head seat (107), and the second columns are provided with second strain gauges; the push rods transversely pass through the sensor holes (1082) on the heating furnace (108) and fit with the outer wall of the sleeve (102), and the push rods are transversely connected to the second columns.

4. The testing machine according to claim 3, characterized in that: The four second uprights are arranged at 90 degrees in the circumferential direction of the outer side of the heating furnace (108). ° Evenly distributed.

5. The testing machine according to claim 3, characterized in that: The ejector rod is a ceramic ejector rod.

6. The testing machine according to claim 1, characterized in that: The gap between the heating furnace (108) and the sleeve (102) is 5 to 10 mm.

7. The testing machine according to claim 1, characterized in that: The thermally conductive filler (103) is magnesium oxide powder.

8. The testing machine according to claim 1, characterized in that: The confining pressure medium of the gas confining pressure system is an inert gas.

9. The testing machine according to claim 1, characterized in that: A resistance wire (1081) is arranged inside the heating furnace (108).

10. The testing machine according to claim 1, characterized in that: The casing (102) is a steel pipe.

Images