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High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method

A high-temperature and high-pressure, test-device technology, used in measuring devices, using stable tension/pressure to test material strength, permeability/surface area analysis, etc., can solve problems such as inability to meet hydraulic fracturing

Active Publication Date: 2015-05-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing triaxial fracturing simulation test devices and methods are all aimed at hydraulic fracturing or shale gas fracturing, which can only meet indoor fracturing simulation under conventional conditions, but cannot simulate hydraulic fracturing under high temperature conditions in deep buried formations. fission and supercritical CO 2 fracture

Method used

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  • High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method
  • High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method
  • High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0033] Detailed ways: According to the requirements of the experiment, there are two options for the size and specification of the coal rock specimen 19, namely: 100×100×100mm or 300×300×300mm. The test device can meet the test requirements of simulating the geological environment conditions of mineral burial depth up to 2000m, and the test piece 19 is heated to 400° C. through the heating rod 22 .

[0034] The true triaxial real-time loading system 1 loads different axial pressures and horizontal pressures in two directions on the test piece 19, so as to simulate the real burial geological environment of minerals. The fracturing fluid injection system uses a set of servo booster pumps to inject fracturing fluid or supercritical CO into the simulated wellbore 2 Fracturing was performed on specimen 19. The temperature loading and heat preservation control system 6 mainly provides a predetermined heating temperature for the test piece 19 so that the test piece 19 is evenly he...

Embodiment approach 1

[0036] In this implementation example, 100×100×100 mm is taken as an example. Hydraulic fracturing was selected as the fracturing method, the stress condition of the 2000m deep formation was simulated, and the temperature loading was selected as 400°C.

[0037] Adopt the experimental method of the test device of described simulation hydraulic fracturing process, comprise the steps:

[0038] Step 1: Before the experiment, process and drill a central hole 17 of Φ10mm and a depth of 70mm on the 100×100×100mm test piece 19. This hole is used to insert the fracturing string 21 to simulate the wellbore, and the central hole 17 inserted into the string is drilled. Sealing;

[0039] Step 2: Seal the test piece 19 and the porous plate groove 12 with the ultra-high temperature resistant sealant 13, and clamp it with the pressure transmission plate 14 and send it into the pressure chamber;

[0040] Step 3: Connect each monitoring device, perform true three-axis servo loading, and apply...

Embodiment approach 2

[0047] In this implementation example, 300×300×300mm is taken as an example. Hydraulic fracturing was selected as the fracturing method, the stress condition of the 1000m deep formation was simulated, and the temperature loading was selected as 250°C.

[0048] Adopt the experimental method of the test device of described simulation hydraulic fracturing process, comprise the steps:

[0049] Step 1: Before the experiment, process and drill a central hole 17 of Φ20 mm and a depth of 250 mm on the 300 × 300 × 300 mm test piece 19, which is used to insert the fracturing string 21 to simulate the wellbore, and seal the central hole of the inserted string hole;

[0050] Step 2: Seal the test piece 19 and the porous plate groove 12 with the ultra-high temperature resistant sealant 13, and clamp it with the pressure transmission plate 14 and send it into the pressure chamber;

[0051] Step 3: Connect each monitoring device, perform true three-axis servo loading, and apply axial press...

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Abstract

The invention relates to a high temperature and high pressure coal and rock true triaxial fracturing and seepage test device and a test method, and belongs to the technical field of rock mechanics and engineering. The device is characterized by comprising a true triaxial servo control real-time loading system 1, a hydraulic fracturing system 2, a supercritical CO2 fracturing system 3, a seepage system 4, a circulating cooling system 5, a temperature loading and keeping control system 6, an acoustic emission monitoring system 7, a pressure-deformation test system 8 and a data acquisition and automation control system 9. The buried conditions of real stratum can be simulated, and a specimen 19 is heated at high temperatures to simulate the depth stratum temperature environment; a fracturing test is conducted by high pressure water power or supercritical CO2; by injecting high pressure pore water or gas, a coal rock permeability test is conducted and the fracturing effect is tested; the fracture initiation, propagation and opening and closing properties of cracks generated by fracturing are monitored by the acoustic emission monitoring system 7 in the whole process, and the mechanism of formation and propagation of the cracks is mastered by observation and analysis, so that the theoretical basis and experimental basis is provided for fracturing exploitation.

Description

technical field [0001] The invention relates to a coal rock high temperature and high pressure true triaxial fracturing seepage test device and test method, and the fracturing medium is gas or liquid. It belongs to the field of rock mechanics and engineering technology. Through rock mechanics tests such as fracturing, seepage and deformation characteristics of specimens, the stress-strain and other rock mechanical properties of coal and rock under different stress and high temperature conditions and their changing laws are revealed; true triaxial loading can simulate the burial conditions of real formations ;Drilled holes in the pressure transmission plate around the pressure chamber and built-in heating rod for high temperature heating; through high-pressure hydraulic or supercritical CO 2 Carry out fracturing tests; observe, control and analyze the initiation, expansion and opening and closing characteristics of the through-fractures generated by fracturing through the acou...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N15/08
Inventor 梁卫国武鹏飞胡耀青耿毅德
Owner TAIYUAN UNIV OF TECH
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