Temperature control device for measuring traction-separation curve of cohesive force of rock and use method of temperature control device

Abstract

The invention relates to the technical field of rock parameter measurement, in particular to a temperature control device for rock cohesion traction-separation curve measurement and a use method thereof. The device is connected with a computer control module and comprises a shell, a loading module, a temperature control assembly and a temperature monitoring module, and the loading module, the temperature control assembly and the temperature monitoring module are connected with the computer control module and are controlled through the computer control module. The device is automatically heated through the computer control module, the heating efficiency is high, the temperature in the cavity is monitored in real time through the temperature monitoring module, temperature control is easily achieved, and the environment is closed. Transparent high-temperature-resistant anti-fogging glass is installed at an opening in the front end of the shell, visualization operation is convenient, measurement of a rock cohesive force traction-separation curve under the controllable high-temperature condition can be achieved, and great significance is achieved for revealing an ultra-deep and ultra-deep rock crack fracture mechanism and an extension evolution law.

Description

Technical Field

[0001] The invention relates to the technical field of rock parameter measurement, and in particular to a temperature control device for measuring rock cohesion traction-separation curve and a use method thereof. Background Art

[0002] Fracturing is currently the most commonly used reservoir stimulation technology, but ultra-deep and ultra-deep fracturing is prone to difficulties in forming wide dynamic cracks and crack failure due to the influence of high temperature, which leads to reduced fracturing effect. Therefore, it is necessary to conduct experimental research on rock crack expansion under high temperature to reveal the rupture mechanism and expansion characteristics of rock cracks under high temperature.

[0003] In recent years, the cohesive zone model (CZM) has become an important tool for simulating and analyzing the fracture, delamination, debonding and macro- and micro-damage mechanical behaviors of composite materials by virtue of its advantage of effectively solving the research difficulties brought by the singularity of crack tip. It regards the fracture of materials as a nonlinear problem and uses the traction-separation curve (TS curve) as the constitutive relationship to describe the entire process of interface deformation, damage and crack initiation, propagation to fracture failure in composite materials.

[0004] The traction-separation curve is an important parameter of the model. One of the effective methods for its experimental determination is the hybrid measurement method of data imaging technology (DIC) and field projection method. This requires the use of high-speed cameras to record and process data during the rock loading experiment. However, with the deepening of research, we need to apply controllable high temperature conditions to the rock samples during the experiment. At present, rock loading experiments under controllable high temperature conditions are generally achieved through closed temperature-controlled containers. This makes it difficult for us to use high-speed cameras to record data during the experiment. If such problems cannot be solved, further experimental research under high temperature conditions will not be possible. For this reason, we provide a temperature control device and method for measuring the traction-separation curve of rock cohesion under high temperature conditions, which can realize the measurement of the traction-separation curve of the rock cohesion model under controllable high temperature conditions, which is of great significance to revealing the fracture mechanism and expansion evolution law of ultra-deep rock cracks. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a temperature control device for measuring rock cohesion traction-separation curve and its use method, which is used for measuring rock cohesion traction-separation curve under high temperature conditions. The technical solution adopted is:

[0006] A temperature control device for measuring rock cohesion traction-separation curve, comprising a computer control module, the computer control module is installed with software for testing rock cohesion traction-separation curve, the device also comprises a loading module, a temperature control component, and a temperature monitoring module;

[0007] The shell comprises an upper top plate, a lower bottom plate, a left side wall, a right side wall, and a rear side wall, wherein the upper top plate, the lower bottom plate, the left side wall, the right side wall, and the rear side wall surround and form a cavity, and a circular hole starts in the center of the upper top plate;

[0008] The loading module includes an upper axial loading element and a lower axial loading element. The upper axial loading element is installed in the circular hole in the center of the upper top plate, the bottom end of the upper axial loading element is inserted into the cavity, and the top end is located above the shell; the lower axial loading element is installed in the center of the lower bottom plate, and the upper axial loading element is connected to the computer control module, and the upper and lower operations are controlled by the computer control module;

[0009] The temperature control assembly includes at least two temperature control elements, which are mounted on the side walls and / or the lower bottom plate of the housing, and are connected to the computer control module via data cables or wireless signals, and are controlled by the computer control module;

[0010] The temperature monitoring module includes at least one temperature sensor, which is installed on the upper top plate on one side of the upper axial loading element, and is connected to the computer control module.

[0011] Preferably, a transparent high-temperature resistant anti-fogging glass is installed at the front end opening of the shell, and the size of the high-temperature resistant anti-fogging glass is adapted to the front end opening of the shell; one side of the high-temperature resistant anti-fogging glass is connected to the side wall of the shell through a rotating shaft, and a handle is installed on the other side, and a sealing strip is set on the edge in contact with the shell.

[0012] Preferably, the lower axial loading element is installed directly below the upper axial loading element, and the upper axial loading element and the lower axial loading element are cylindrical structures with the same diameter, and a spacing distance is formed between the upper axial loading element and the lower axial loading element. The distance between the upper axial loading element and the lower axial loading element is greater than 0 and is smaller than the distance between the upper top plate of the housing and the lower axial loading element.

[0013] Preferably, the diameter of the circular hole of the upper top plate is matched with the outer diameter of the upper axial loading element.

[0014] Preferably, eight temperature control elements are provided and installed on the left and right side walls and the lower base plate of the shell.

[0015] Preferably, each temperature control element is mounted on the left and right side walls and the lower base plate of the shell through a bracket.

[0016] Preferably, the temperature monitoring module includes two temperature sensors, openings are provided on the upper top plate on the left and right sides of the upper axial loading element, and each temperature sensor is installed in the opening and probed into the cavity.

[0017] Preferably, a sealing ring is installed at the contact point between the upper side of each temperature sensor and the opening.

[0018] Preferably, a heat insulation layer is installed on the outer side of the top end of the upper roof plate.

[0019] The method for using the temperature control device for measuring the rock cohesion traction-separation curve comprises the following steps:

[0020] Step 1: Connecting the device to a rock loading device;

[0021] Step 2: Open the high temperature resistant anti-fogging glass, arrange the rock sample on the lower axial loading element, and after the arrangement is completed, close the high temperature resistant anti-fogging glass to make the cavity in a closed state;

[0022] Step 3: Preset the temperature through the computer control module, and turn on the temperature control component by operating the computer control module to heat the internal space of the cavity until the required temperature is reached, and then receive the temperature data in real time through the temperature monitoring module to adjust the temperature inside the cavity;

[0023] Step 4: When the temperature in the cavity reaches the preset temperature, the computer control module will send a prompt signal. At this time, the upper axial loading element is controlled by the computer control module, and the next test is started through the rock loading device, that is, the rock cohesive traction-separation curve is measured until complete experimental data is obtained.

[0024] Compared with the prior art, the present invention is beneficial in that:

[0025] The device of the present invention automatically heats the device through a computer control module, has high heating efficiency, and monitors the temperature inside the cavity in real time through a temperature monitoring module, so that temperature control is easy to achieve, and the environment is sealed.

[0026] The device of the present invention has a transparent high-temperature resistant anti-fogging glass installed at the front opening of the shell, which can realize the problem of simultaneously taking pictures with a high-speed camera (DIC) to record data during the test process. The visual operation is convenient and can realize the measurement of the rock cohesion traction-separation curve under controllable high-temperature conditions, which is of great significance for revealing the rupture mechanism and expansion evolution law of ultra-deep and extra-deep rock cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the three-dimensional structure of a temperature control device for measuring rock cohesion traction-separation curve according to the present invention;

[0028] Figure 2 A front view of a temperature control device for measuring rock cohesion traction-separation curve according to the present invention;

[0029] Figure 3 A schematic diagram of a temperature control element of a temperature control device for measuring rock cohesion traction-separation curve of the present invention;

[0030] Figure 4 A schematic diagram of a temperature monitoring module of a temperature control device for measuring rock cohesion traction-separation curve of the present invention;

[0031] Figure 5 The present invention is a flow chart of the method for using the temperature control device for measuring the rock cohesion traction-separation curve.

[0032] In the figure, 1-shell, 2-cavity, 3-lower axial loading element, 4-upper axial loading original component, 5-temperature control element, 6-temperature monitoring module, 6-1: temperature sensor, 6-2: sealing ring, 7-bracket, 8-insulating layer, 9-lower base plate, 10-high temperature resistant anti-fogging glass, 11-computer. DETAILED DESCRIPTION

[0033] The accompanying drawings are only for illustrative purposes; in order to enable those skilled in the art to better understand the present invention, the present technical solution will be described clearly and completely in conjunction with the embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Unless otherwise specified in the present invention, the components used can be purchased through regular commercial channels, such as temperature control elements, temperature sensors, etc.

[0034] Example 1

[0035] like Figure 1 , 2 As shown, the temperature control device for measuring the rock cohesion traction-separation curve includes a housing and a computer control module, and the computer control module is installed on a computer 11. The computer control module is installed with software for testing the rock cohesion traction-separation curve, and the device also includes a loading module, a temperature control component, and a temperature monitoring module 6;

[0036] The housing 1 includes an upper top plate, a lower bottom plate 9, a left side wall, a right side wall, and a rear side wall, which surround a cavity 2, and a circular hole starts in the center of the upper top plate;

[0037] The loading module for loading the rock sample includes an upper axial loading element 4 and a lower axial loading element 3. The upper axial loading element 4 is tightly embedded in the circular hole in the center of the upper top plate, and the diameter of the circular hole of the upper top plate is adapted to the outer diameter of the upper axial loading element 4. The lower axial loading element 3 is installed directly below the upper axial loading element 4. The upper axial loading element 4 and the lower axial loading element 3 are cylindrical structures with the same diameter, and a spacing distance is formed between the upper and lower parts.

[0038] The bottom end of the upper axial loading element 4 extends into the cavity 2, and the top end thereof is located above the housing 1 ( Figure 1 , 2 The entire height of the upper axial loading element is not shown in the figure); the lower axial loading element 3 is installed in the center of the lower base plate 9 to fix the rock sample, and the upper axial loading element 4 is connected to the computer control module to control the up and down movement through the computer control module. The upper axial loading element 4 can reach the rock sample placed on the lower axial loading element 3.

[0039] In order to insulate and seal the cavity 2, a transparent high-temperature resistant anti-fogging glass 10 is installed at the front end opening of the shell 1, and the size of the high-temperature resistant anti-fogging glass 10 is adapted to the front end opening of the shell 1; one side of the high-temperature resistant anti-fogging glass 10 is connected to the side wall of the shell 1 through a rotating shaft, and a handle is installed on the other side, and a sealing strip is set on the edge in contact with the shell 1.

[0040] like Figure 3 As shown, the temperature control assembly includes 8 temperature control elements 5, three of which are installed on the left side wall of the shell, three of which are installed on the right side wall of the shell, and two are installed on the lower bottom plate 9, on both sides of the lower axial loading element 3. The temperature control elements are connected to the computer control module through data cables or wireless signals and are controlled by the computer control module. Each temperature control element 5 is used to heat and keep the cavity 2 warm, and is installed on the left and right side walls and the lower bottom plate 9 of the shell 1 through a bracket 7, so that the device can reach a preset temperature. The bracket 7 can also play a role of spacing to prevent the temperature of the temperature control element 5 from being too high when heated, causing the side wall of the shell to be too hot.

[0041] like Figure 4 As shown, the temperature monitoring module 6 includes two temperature sensors 6-1, which are installed on the upper top plates on both sides of the upper axial loading element 4. The temperature sensors 6-1 are connected to the computer control module. Openings are set on the upper top plates on the left and right sides of the upper axial loading element 4, and each temperature sensor 6-1 is installed in the opening, inserted into the cavity 2, and sealed by a sealing ring 6-2.

[0042] As a further preference, a heat insulation layer 8 is installed on the outer side of the top end of the upper roof plate.

[0043] like Figure 5As shown, the method for using the temperature control device for measuring the rock cohesion traction-separation curve includes the following steps:

[0044] Step 1: Connecting the device to a rock loading device;

[0045] Step 2: Open the high temperature resistant anti-fogging glass, arrange the rock sample on the lower axial loading element, and after the arrangement is completed, close the high temperature resistant anti-fogging glass to make the cavity in a closed state;

[0046] Step 3: Preset the temperature through the computer control module, and turn on the temperature control component by operating the computer control module to heat the internal space of the cavity until the required temperature is reached, and then receive the temperature data in real time through the temperature monitoring module to adjust the temperature inside the cavity;

[0047] Step 4: When the temperature in the cavity reaches the preset temperature, the computer control module will send a prompt signal. At this time, the upper axial loading element is controlled by the computer control module, and the next test is started through the rock loading device, that is, the rock cohesion traction-separation curve is measured. During the test, the changes of the rock sample inside the device can be observed at any time through the high temperature resistant anti-fogging glass until complete experimental data are obtained.

[0048] Example 2

[0049] The temperature control assembly includes two temperature control elements 5 for heating and keeping the cavity 2 warm. The temperature control elements 5 are mounted on the left and right side walls of the housing 1 via brackets 7 so that the device can reach a preset temperature.

[0050] The temperature monitoring module 6 includes a temperature sensor 6-1, which is mounted on the upper top plate on one side of the upper axial loading element 4. The temperature sensor 6-1 and the opening are sealed by a sealing ring 6-2.

[0051] A heat insulation layer 8 is installed on the outer side of the top end of the upper roof plate, and a heat insulation layer is also installed on the outer side of each side wall.

[0052] Other unmentioned places are the same as those in Example 1.

[0053] Example 3

[0054] The temperature control assembly includes three temperature control elements 5, which are mounted on the left and right side walls and the rear side wall of the housing 1 through a bracket 7, so that the device can reach a preset temperature.

[0055] The temperature monitoring module 6 includes a temperature sensor 6-1, which is mounted on the upper top plate on one side of the upper axial loading element 4. The temperature sensor 6-1 and the opening are sealed by a sealing ring 6-2.

[0056] Other unmentioned parts are the same as those in Example 2.

[0057] Example 4

[0058] The temperature control assembly includes five temperature control elements 5, which are installed through a bracket 7, two of which are installed on the left and right side walls of the housing 1, and one is installed on the rear side wall, so that the device can reach a preset temperature.

[0059] The temperature monitoring module 6 includes a temperature sensor 6-1, which is mounted on the upper top plate on one side of the upper axial loading element 4. The temperature sensor 6-1 and the opening are sealed by a sealing ring 6-2.

[0060] Other unmentioned parts are the same as those in Example 2.

[0061] Example 5

[0062] The temperature control assembly includes 6 temperature control elements 5, which are installed through a bracket 7, two of which are installed on the left and right side walls of the housing 1, and two are installed on the lower bottom plate, so that the device can reach a preset temperature.

[0063] The temperature monitoring module 6 includes a temperature sensor 6-1, which is mounted on the upper top plate on one side of the upper axial loading element 4. The temperature sensor 6-1 and the opening are sealed by a sealing ring 6-2.

[0064] Other unmentioned parts are the same as those in Example 2.

[0065] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0066] The terms "install", "set", "have", "connect", "connected", and "socket" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A temperature control device for measuring rock cohesion traction-separation curve, the device being connected to a computer control module and comprising a housing, characterized in that: It also includes a loading module, a temperature control component, and a temperature monitoring module; The shell comprises an upper top plate, a lower bottom plate, a left side wall, a right side wall, and a rear side wall, wherein the upper top plate, the lower bottom plate, the left side wall, the right side wall, and the rear side wall surround and form a cavity, and a circular hole starts in the center of the upper top plate; The loading module includes an upper axial loading element and a lower axial loading element. The upper axial loading element is installed in the circular hole in the center of the upper top plate, the bottom end of the upper axial loading element is inserted into the cavity, and the top end is located above the shell; the lower axial loading element is installed in the center of the lower bottom plate, and the upper axial loading element is connected to the computer control module, and the upper and lower operations are controlled by the computer control module; The temperature control assembly includes at least two temperature control elements, which are mounted on the side walls and / or the lower bottom plate of the housing, and are connected to the computer control module via data cables or wireless signals, and are controlled by the computer control module; The temperature monitoring module includes at least one temperature sensor, which is installed on the upper top plate on one side of the upper axial loading element, and is connected to the computer control module.

2. The temperature control device for measuring rock cohesion traction-separation curve according to claim 1, characterized in that: A transparent high-temperature resistant anti-fogging glass is installed at the front opening of the shell, and the size of the high-temperature resistant anti-fogging glass is adapted to the front opening of the shell; one side of the high-temperature resistant anti-fogging glass is connected to the side wall of the shell through a rotating shaft, and a handle is installed on the other side, and a sealing strip is set on the edge in contact with the shell.

3. The temperature control device for measuring rock cohesion traction-separation curve according to claim 2, characterized in that: The lower axial loading element is installed directly below the upper axial loading element. The upper axial loading element and the lower axial loading element are cylindrical structures with the same diameter, and a spacing distance is formed between the upper and lower parts.

4. The temperature control device for measuring rock cohesion traction-separation curve according to claim 3, characterized in that: The diameter of the circular hole of the upper top plate is matched with the outer diameter of the upper axial loading element.

5. The temperature control device for measuring rock cohesion traction-separation curve according to claim 2, characterized in that: The temperature control elements are arranged in 8 pieces and are installed on the left and right side walls and the lower bottom plate of the shell.

6. The temperature control device for measuring rock cohesion traction-separation curve according to claim 5, characterized in that: Each temperature control element is installed on the left and right side walls and the lower bottom plate of the shell through a bracket.

7. The temperature control device for measuring rock cohesion traction-separation curve according to claim 2, characterized in that: The temperature monitoring module includes two temperature sensors. Openings are arranged on the upper top plate on the left and right sides of the upper axial loading element. Each temperature sensor is installed in the opening and probes into the cavity.

8. The temperature control device for measuring rock cohesion traction-separation curve according to claim 7, characterized in that: A sealing ring is installed at the contact point between the upper side of each temperature sensor and the opening.

9. The temperature control device for measuring rock cohesion traction-separation curve according to claim 2, characterized in that: A heat insulation layer is installed on the outer side of the top end of the upper roof plate.

10. The method for using the temperature control device for measuring rock cohesion traction-separation curve according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Connecting the device to a rock loading device; Step 2: Open the high temperature resistant anti-fogging glass, arrange the rock sample on the lower axial loading element, and after the arrangement is completed, close the high temperature resistant anti-fogging glass to make the cavity in a closed state; Step 3: Preset the temperature through the computer control module, and turn on the temperature control component by operating the computer control module to heat the internal space of the cavity until the required temperature is reached, and then receive the temperature data in real time through the temperature monitoring module to adjust the temperature inside the cavity; Step 4: When the temperature in the cavity reaches the preset temperature, the computer control module will send a prompt signal. At this time, the upper axial loading element is controlled by the computer control module, and the next test is started through the rock loading device, that is, the rock cohesive traction-separation curve is measured until complete experimental data is obtained.

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