Large three-dimensional triaxial fracturing experiment device
By designing a large three-dimensional triaxial fracturing experimental device, the soil conveying device is used to accurately control the amount of soil addition and the fracturing fluid flow rate, the problem of inconsistent initial conditions in traditional experiments is solved, the repeatability and accuracy of the experimental results are improved, and the authenticity of the experiment is enhanced.
Patent Information
- Application Number
- CN202422050356.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In traditional geological mechanics experiments, artificial addition of soil leads to inconsistent initial conditions of experimental samples, affecting the repeatability and accuracy of experimental results.
A large three-dimensional triaxial fracturing experimental device was designed, including a fracturing experimental groove, a soil conveying device and a force measuring sensor. The soil addition amount and fracturing fluid flow rate are accurately controlled through the soil conveying device to ensure the consistency of experimental conditions.
Accurate control of the initial conditions of the experimental samples is achieved, the repeatability and accuracy of the experimental results are improved, and different underground environmental conditions are simulated, increasing the authenticity of the experiment.
Smart Images
Figure CN223037633U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of fracturing experiments, in particular to a large-scale three-dimensional triaxial fracturing experiment device. Background Art
[0002] In traditional geomechanics experiments, in order to study the mechanical behavior of rocks or soils during the fracturing process, the method of manually adding soil and manually controlling the flow rate of the fracturing fluid is usually adopted. However, this method has certain deficiencies. When manually adding soil, due to the differences in the experience, skills and attention of the operators, it is very difficult to ensure that the amount of soil added each time is exactly the same. This difference may cause deviations in the initial conditions of the experimental samples, thus affecting the subsequent experimental results and the repeatability and accuracy of the experimental results. Content of the Utility Model
[0003] The purpose of the utility model is to provide a large-scale three-dimensional triaxial fracturing experiment device to solve the problems put forward in the above background art.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A large-scale three-dimensional triaxial fracturing experiment device includes: a fracturing experiment tank, a lower pressing device is fixed on the upper side of the fracturing experiment tank, soil conveying devices are fixed on both sides of the fracturing experiment tank, a reserved groove is opened on the fracturing experiment tank, and a force measuring sensor is fixed at the bottom of the fracturing experiment tank;
[0006] The soil conveying device includes a conveying box, conveying boxes are fixed on both sides of the fracturing experiment tank, a hollow groove is opened on the conveying box, an electric control valve is fixed on the lower side of the conveying box, and a conveying pipe is fixed in the output end direction of the electric control valve.
[0007] Before the experiment starts, place the soil or rock sample to be tested in the fracturing experiment tank. According to needs, the soil can be evenly added or supplemented to the experiment tank through the soil conveying device to ensure the same initial conditions of the experimental samples. Then connect the electric control valve with an external controller. After connection, by controlling and adjusting the electric control valve in the soil conveying device through the controller, the amount of soil conveyed into the experiment tank by the conveying pipe or the flow rate of the simulated fracturing fluid can be precisely controlled to simulate the underground environment under different conditions.
[0008] Preferably, the lower pressing device includes a support frame, a support frame is fixed on the upper side of the fracturing experiment tank, a hydraulic cylinder is fixed on the lower side of the support frame, and a jack is fixed in the output end direction of the hydraulic cylinder through a piston rod.
[0009] The pressing device starts, and the hydraulic cylinder drives the jack to press down through the piston rod, applying a vertically downward pressure to the sample in the experimental tank. The fitting design between the jack and the inner side wall of the experimental tank ensures uniform pressure transmission to the sample. As the pressure gradually increases, the stress state inside the sample will change until the fracturing condition is reached, resulting in cracks or fractures.
[0010] Preferably, the force measuring sensor includes at least one strain gauge for measuring and recording the force exerted on the soil or rock sample during the experiment.
[0011] During the entire experiment, the force measuring sensor continuously monitors and records the change in the force value exerted on the sample.
[0012] Preferably, there are at least two conveying boxes in the soil conveying device, which are symmetrically arranged on both sides of the fracturing experimental tank to ensure uniform distribution of soil or simulated fracturing fluid during the experiment.
[0013] Preferably, the reserved grooves are inclinedly opened on both sides of the fracturing experimental tank.
[0014] Preferably, the pressing device is directly above the axis of the fracturing experimental tank.
[0015] Preferably, when the jack presses down, it is in a fitting relationship with the inner side wall of the fracturing experimental tank.
[0016] Compared with the prior art, the present utility model provides a large-scale three-dimensional triaxial fracturing experimental device, which has the following beneficial effects:
[0017] After the conveying box and the electric control valve provided in the soil conveying device of the present utility model are connected to the external controller, the present utility model can accurately control the amount of soil or the flow rate of the simulated fracturing fluid conveyed into the experimental tank through the conveying pipe, simulate the underground environment under different conditions, and the reserved grooves help to guide the displacement and stress distribution of the sample during the fracturing process, increasing the simulation authenticity of the experiment, and solving the problem in the prior art that the amount of soil and the flow rate of the simulated fracturing fluid cannot be accurately controlled. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional structure schematic diagram of a large-scale three-dimensional triaxial fracturing experimental device proposed by the present utility model;
[0019] Figure 2 It is an exploded structure schematic diagram of a large-scale three-dimensional triaxial fracturing experimental device proposed by the present utility model;
[0020] Figure 3 It is a three-dimensional structure schematic diagram of a large-scale three-dimensional triaxial fracturing experimental device proposed by the present utility model;
[0021] Figure 4Schematic diagram of the decomposition structure of a large-scale three-dimensional triaxial fracturing experiment device proposed by the present utility model;
[0022] Figure 5 Enlarged view of the node at position A of a large-scale three-dimensional triaxial fracturing experiment device proposed by the present utility model.
[0023] In the figure: 1, fracturing experiment tank; 2, lower pressing device; 21, support frame; 22, hydraulic cylinder; 23, jack; 3, soil conveying device; 31, conveying box; 32, hollow groove; 33, electric control valve; 34, conveying pipe; 4, force measuring sensor; 5, reserved groove. Specific implementation manner
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. Embodiment 1
[0026] Refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , a large-scale three-dimensional triaxial fracturing experiment device, comprising: a fracturing experiment tank 1, a lower pressing device 2 is fixed on the upper side of the fracturing experiment tank 1, soil conveying devices 3 are fixed on both sides of the fracturing experiment tank 1, a reserved groove 5 is opened on the fracturing experiment tank 1, and a force measuring sensor 4 is fixed at the bottom of the fracturing experiment tank 1;
[0027] The soil conveying device 3 includes a conveying box 31, conveying boxes 31 are fixed on both sides of the fracturing experiment tank 1, a hollow groove 32 is opened on the conveying box 31, an electric control valve 33 is fixed on the lower side of the conveying box 31, and a conveying pipe 34 is fixed in the output end direction of the electric control valve 33.
[0028] Before the experiment starts, place the soil or rock sample to be tested in the fracturing experiment tank 1. As needed, soil can be evenly added or supplemented to the experiment tank through the soil conveying device 3 to ensure that the initial conditions of the experimental samples are consistent. Then connect the electric control valve 33 to an external controller. After connection, by controlling the electric control valve 33 in the soil conveying device 3 through the controller, the amount of soil conveyed into the experiment tank by the conveying pipe 34 or the flow rate of the simulated fracturing fluid can be precisely controlled to simulate the underground environment under different conditions.
[0029] The downward pressing device 2 includes a support frame 21. The support frame 21 is fixed to the upper side of the fracturing experiment tank 1, and a hydraulic cylinder 22 is fixed to the lower side of the support frame 21. The output end of the hydraulic cylinder 22 is fixed with a jack 23 through a piston rod.
[0030] When the downward pressing device 2 is activated, the hydraulic cylinder 22 drives the jack 23 to press downward through the piston rod, applying a vertically downward pressure to the sample in the experiment tank. The fitting design between the jack 23 and the inner side wall of the experiment tank ensures uniform transmission of the pressure to the sample. As the pressure gradually increases, the stress state inside the sample will change until the fracturing condition is reached, resulting in cracks or fractures.
[0031] The force measuring sensor 4 includes at least one strain gauge, which is used to measure and record the force exerted on the soil or rock sample during the experiment.
[0032] During the entire experiment, the force measuring sensor 4 continuously monitors and records the change in the force value exerted on the sample.
[0033] There are at least two conveying boxes 31 in the soil conveying device 3, and they are symmetrically arranged on both sides of the fracturing experiment tank 1 to ensure uniform distribution of the soil or simulated fracturing fluid during the experiment.
[0034] The reserved grooves 5 are inclinedly opened on both sides of the fracturing experiment tank 1.
[0035] The downward pressing device 2 is located directly above the axis of the fracturing experiment tank 1.
[0036] When the jack 23 presses downward, it is in a fitting relationship with the inner side wall of the fracturing experiment tank 1.
[0037] Working principle: Please refer to Figures 1 - 5As shown, first, before the experiment starts, place the soil or rock sample to be tested in the fracturing experiment tank 1. As needed, the soil conveying device 3 can be used to evenly add or supplement soil to the experiment tank to ensure that the initial conditions of the experimental samples are consistent. Then connect the electric control valve 33 to an external controller. After connection, by controlling the electric control valve 33 in the soil conveying device 3 through the controller, the amount of soil conveyed into the experiment tank by the conveying pipe 34 or the flow rate of the simulated fracturing fluid can be precisely controlled to simulate the underground environment under different conditions. At the same time, the design of the reserved tank 5 helps to guide the displacement and stress distribution of the sample during the fracturing process, increasing the simulation authenticity of the experiment. Subsequently, the pressing device 2 is activated, and the hydraulic cylinder 22 drives the jack 23 to press down through the piston rod, applying a vertically downward pressure to the sample in the experiment tank. The fitting design of the jack 23 with the inner side wall of the experiment tank ensures uniform pressure transmission to the sample. As the pressure gradually increases, the stress state inside the sample will change until the fracturing condition is reached, resulting in cracks or fractures. During the entire experiment, the force measuring sensor 4 will continuously monitor and record the change in the force value received by the sample. These data are crucial for analyzing the mechanical properties, fracturing behavior, and crack propagation law of the sample, etc. Based on the experimental data, researchers can evaluate the influence of different conditions (such as pressure magnitude, soil type, water content, etc.) on the fracturing effect, providing a theoretical basis for relevant engineering design and construction.
Claims
1. A large-scale three-dimensional triaxial fracturing experimental device, comprising: A fracturing test trough (1), wherein a downward pressure device (2) is fixed on the upper side of the fracturing test trough (1), characterized in that soil conveying devices (3) are fixed on both sides of the fracturing test trough (1), a reserved groove (5) is opened on the fracturing test trough (1), and a force sensor (4) is fixed on the bottom of the fracturing test trough (1); The soil conveying device (3) comprises a conveying box (31), and conveying boxes (31) are fixed on both sides of the fracturing test tank (1). A hollow groove (32) is provided on the conveying box (31). An electric control valve (33) is fixed on the lower side of the conveying box (31), and a conveying pipe (34) is fixed in the output direction of the electric control valve (33).
2. A large-scale three-dimensional triaxial fracturing experimental device according to claim 1, characterized in that: The pressing device (2) comprises a support frame (21), the support frame (21) is fixed on the upper side of the fracturing test tank (1), a hydraulic cylinder (22) is fixed on the lower side of the support frame (21), and a jack (23) is fixed to the output end direction of the hydraulic cylinder (22) via a piston rod.
3. A large-scale three-dimensional triaxial fracturing experimental device according to claim 1, characterized in that: The force sensor (4) comprises at least one strain gauge, which is used to measure and record the force exerted on the soil or rock sample during the experiment.
4. A large-scale three-dimensional triaxial fracturing experimental device according to claim 1, characterized in that: The soil conveying device (3) has at least two conveying boxes (31), which are symmetrically arranged on both sides of the fracturing test tank (1), thereby ensuring uniform distribution of soil or simulated fracturing fluid during the experiment.
5. The large-scale three-dimensional triaxial fracturing experimental device according to claim 1, characterized in that: The reserved grooves (5) are obliquely opened on both sides of the fracturing test groove (1).
6. A large-scale three-dimensional triaxial fracturing experimental device according to claim 1, characterized in that: The downward pressure device (2) is located directly above the axis of the fracturing test tank (1).
7. A large-scale three-dimensional triaxial fracturing experimental device according to claim 2, characterized in that: When the jack (23) is pressed downward, it is in a fitted relationship with the inner wall of the fracturing test tank (1).