Coal petrography multiphase different fluid three-axis crushing test unit and method

A fracturing test, triaxial pressure technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve problems such as comparison of fracturing effects

Active Publication Date: 2016-04-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is a coal-rock multi-phase different fluid triaxial fracturing test device and test method. Different fracturing media and their different destructive characteristics under various test conditions disclose a kind of intuitive and efficient multi-phase fluid fracturing media and its multi-conditions for a certain underground depth and temperature mineral coal rock mass. , Reliable triaxial fracturing test device and test method

Method used

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  • Coal petrography multiphase different fluid three-axis crushing test unit and method
  • Coal petrography multiphase different fluid three-axis crushing test unit and method
  • Coal petrography multiphase different fluid three-axis crushing test unit and method

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Experimental program
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Embodiment approach 1

[0028] Implementation Mode 1: Taking the Φ75×150mm coal rock specimen as an example, the pressurization rate is compared with the CO 2 Gas fracturing, CO 2 Liquid fracturing, supercritical CO 2 Comparative research experiment of fracturing and hydraulic fracturing; the specific experimental steps are as follows:

[0029] Step 1: Process the coal and rock specimens with high-precision CNC wire cutting equipment to obtain raw coal and rock specimens of Φ75×150 mm, and use a high-precision drilling machine bench drill to drill holes on the end face of the dried specimens with a diameter of Φ15 mm. The depth is 75mm;

[0030] Step 2: Seal the middle and upper part of the fracturing pipe 11 with a high-temperature sealant to the central hole contained in the coal-rock test piece 19, and then attach the upper and lower sets of acoustic emission sensors 20 to the coal-rock test piece 19 and fix them on the upper pressure head 12 1. In the acoustic emission hole reserved by the low...

Embodiment approach 2

[0037] Embodiment 2: Taking Φ75×150mm coal and rock specimens as an example, the supercritical CO 2 The research and comparison of fracturing effects, the specific research steps are: repeat the experimental steps 1, 2, 3, 7, and 8 in Embodiment 1, and at step 7, adjust the supercritical CO 2 The pressure and temperature of the fracturing medium are used to change its viscosity, so that the viscosity of the supercritical CO 2 Research and comparison experiment of fracturing effect.

Embodiment approach 3

[0038] Implementation Mode 3: Taking the Φ75×150mm coal rock specimen as an example, the CO 2 Gas fracturing, liquid CO 2 Fracturing, supercritical CO 2 The research and comparison of fracturing effects such as fracturing and hydraulic fracturing, the specific experimental steps are: repeat all the experimental steps in Embodiment 1, and change the flow rate control at 30ml / min, 50ml / min, 100ml / min to pass The heating part in the refrigerator 5 and the temperature increasing and boosting integrated device 7 is used to regulate the temperature of the fracturing medium, so as to control the temperature of the medium temperature on the supercritical CO 2 Research and comparison experiment of fracturing effect.

[0039] To sum up, the present invention is mainly used for comparative tests of fracturing of different fluids in multiphase states and conditions of coal rock specimens.

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Abstract

The invention discloses a coal petrography multiphase different fluid three-axis crushing test unit and method and belongs to the technical field of rock and rock mass mechanics and engineering. The unit is composed of a three-axis stress real-time loading system, a multiphase different fluid crushing system, a sealing system, a temperature control system, an acoustic emission monitoring system and a data acquisition system. Different fluid and multiphase crushing test comparison can be conducted on a coal petrography test piece, sensibility of parameters, such as fluid pressurization rate, fluid viscosity, fluid isothermal compressibility and fluid temperature, affecting crushing of the coal petrography test piece can be analyzed under multiple conditions, the change rule of the pressure and temperature of a crushing medium can be precisely recorded in a crushing experiment, acoustic emission events during test piece crushing can be recorded in real time through an assembled micro acoustic emission sensor, and multi-phase fluid seepage tests before and after crushing can also be conducted on the coal petrography test piece.

Description

technical field [0001] The invention discloses a triaxial fracturing test device and test method for multi-phase and different fluids of coal and rock, belonging to the field of rock and rock mass mechanics and engineering technology. Through the fracturing test of coal and rock specimens under different fracturing medium conditions, the comparative analysis of the fracturing effects of different multiphase fluids can be carried out, and various fracturing parameters can be studied at the same time, such as the pressurization rate of the fracturing medium , the viscosity of the fracturing medium, the isothermal compressibility coefficient, and the temperature of the fracturing medium affect the fracturing effect of the test piece, so as to study the fracturing mechanism in depth, explore the main factors affecting the fracturing effect, and provide a theoretical basis for fracturing mining. Background technique [0002] Today, with the rapid economic development, unconventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
CPCG01N3/12
Inventor 梁卫国杨健锋武鹏飞黎力
Owner TAIYUAN UNIV OF TECH
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