True triaxial fracture seepage continuous test system and method

A test system, true triaxial technology, applied in the direction of applying stable tension/pressure to test material strength, measuring device, permeability/surface area analysis, etc., can solve the problem of fracture closure, single test plan, and can not truly reflect the fracturing effect and other issues to achieve the effect of optimal design

Pending Publication Date: 2019-11-08
中国平煤神马控股集团有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing triaxial fracturing seepage simulation test devices or methods can only meet the unidirectional and single-sided fracturing seepage simulation test under conventional conditions, and cannot realize continuous testing of fracturing seepage
The existing fracturing seepage simulation test device can not be carried out continuously, resulting in the closure of the cracks generated by fracturing, the error is increased, and the fracturing effect cannot be truly reflected, and the test plan is single, which cannot meet the needs of experimental testing.

Method used

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  • True triaxial fracture seepage continuous test system and method
  • True triaxial fracture seepage continuous test system and method
  • True triaxial fracture seepage continuous test system and method

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Embodiment 1

[0048] This embodiment describes the structure of the true triaxial fracturing seepage continuous testing system, see figure 1 , which includes a fracturing seepage continuous testing system 1, a true triaxial loading system 2, a confining pressure injection system 3, an acoustic emission monitoring system 4, a servo control system 5 and a data acquisition and control system 6, which can be controlled by a pneumatic reversing valve 11 Under the action of temperature field, seepage field and stress field, simulate the actual stress, temperature and seepage conditions of the rock in the formation, and conduct continuous test of fracturing seepage on the specimen , to test the fracturing effect of the rock mass, and monitor the crack initiation, expansion, opening and closing characteristics of the cracks generated by the fracturing through the acoustic emission monitoring system 4, observe and analyze the formation and expansion mechanism of the cracks, and provide hydraulic frac...

Embodiment 2

[0064] In this implementation example, a 100×100×100mm shale specimen is taken as an example to illustrate the testing method using the above system. The fracturing method is hydraulic fracturing, the seepage medium is carbon dioxide, and the formation is simulated at a depth of 800m at a temperature of 100°C.

[0065]Step 1: Before the test, according to the test requirements, drill a center hole of φ10mm and a depth of 50mm in the cubic shale test piece 17 of 100×100×100mm, insert the fracturing steel pipe into the simulated wellbore 33, and seal the hole.

[0066] Step 2: Put the processed test piece 17 into a cubic rubber barrel 19 of corresponding size, and seal it with glue. After the sealant is dry, put it into the true triaxial high pressure chamber 20.

[0067] Step 3: Connect the fracturing pipeline 22 and seepage pipeline 21 required for the test, inject pure water into the autoclave body 20-3 of the true triaxial high pressure chamber, tighten the cover plate 20-1 ...

Embodiment 3

[0073] In this embodiment, a 300×300×300mm coal rock specimen is taken as an example, the fracturing method is hydraulic fracturing, the adsorption medium is methane, and the formation is simulated at a depth of 100m, and the temperature is 150°C.

[0074] Step 1: Before the test, according to the test requirements, drill a central hole of φ10mm and a depth of 150mm in the cubic test piece 17 of 300×300×300mm, insert the fracturing steel pipe to simulate the wellbore 33, and seal the hole;

[0075] Step 2: Put the processed test piece 17 into a cubic rubber barrel 19 of corresponding size, and seal it with glue. After the sealant is dry, put it into the true triaxial high pressure chamber 20.

[0076] Step 3: Connect the fracturing pipeline 22 and seepage pipeline 21 required for the test, inject pure water into the autoclave body 20-3 of the true triaxial high pressure chamber, tighten the cover plate 20-1 of the true triaxial high pressure chamber, and preload Corresponding...

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Abstract

The invention discloses a true triaxial fracture seepage continuous test system and method, and belongs to the technical field of rock mass mechanics and engineering. The true triaxial fracture seepage continuous test system comprises a fracture seepage continuous test system, a true triaxial loading system, a confining pressure injection system, an acoustic emission monitoring system, a servo control system and a data acquisition and control system. Fracture seepage continuous testing is achieved by control over a pneumatic steering valve, the actual stress, temperature and seepage conditionof rock in stratum is simulated under effects of a temperature field, a seepage field and a stress field, fracture seepage continuous test is performed on a test piece so as to test a fracture effectof the rock, the crack initiation, expansion and opening and closing characteristic of a gap generated by a crack is completely monitored by the acoustic emission monitoring system, the gap formationand expansion mechanism is observed, analyzed and mastered, and theoretical foundation and experiment basis are provided for hydraulic fracturing of coal bed gas and shale gas.

Description

technical field [0001] The invention belongs to the field of rock mechanics and engineering technology, and in particular relates to true triaxial fracturing and seepage testing technology. Background technique [0002] With the development of unconventional natural gas mining technologies such as coalbed methane and shale gas, fracturing seepage testing devices and methods have achieved many successes in recent years. Chinese patent documents related to true triaxial fracturing seepage methods and devices mainly include: CN103993867A "an experimental device and experimental method for simulating shale gas fracturing process"; CN102621000B "a true triaxial pressure device that can realize hydraulic fracturing tests"; CN104655495A "a kind of high temperature and high pressure true triaxial pressure device for coal rock Fracture seepage test device and test method"; CN103883301A "a physical simulation method for hydraulic fracturing of coalbed methane wells". Most of the exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N15/08
CPCG01N3/12G01N15/0826G01N2203/0048G01N2203/0064G01N2203/0066G01N2203/0256
Inventor 葛兆龙张建国吕有厂汤积仁王满王泽鹏王英伟赵汉云仝艳军吕旭明
Owner 中国平煤神马控股集团有限公司
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