Hydraulic fracturing experimental device and experimental method based on split Hopkinson pressure bar
A Hopkinson pressure bar and experimental device technology, which is used in measuring devices, analyzing materials, and testing the strength of materials by applying stable tension/pressure. It can solve problems such as difficulty and achieve convenient operation, simple structure and reasonable design. Effect
Inactive Publication Date: 2021-08-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
At present, research at home and abroad is mainly focused on in-situ stress borehole measurement and numerical simulation, and it is difficult to realize and carry out hydraulic fracturing experiments in a laboratory environment.
Method used
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0034] Such as figure 1 As shown, a hydraulic fracturing experimental device based on a separate Hopkinson pressure bar, including: a separate Hopkinson pressure bar, a dynamic impact fracturing device and a cylindrical confining pressure cylinder (3);
[0035] The separated Hopkinson pressure bar includes: a launching device (1-1), an incident rod (1-2) and a transmission rod (1-3), and a first strain gauge (1- 4), the transmission rod (1-3) is provided with a second strain gauge (1-5); the dynamic impact cracking device is installed at the junction of the incidence rod (1-2) and the transmission rod (1-3) and used The sample (5) is placed; the cylindrical confining pressure cylinder (3) is sleeved on the dynamic impact fracturing device, and the cyli...
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The invention discloses a hydraulic fracturing experimental device and experimental method based on a split Hopkinson pressure bar. The hydraulic fracturing experimental device comprises the split Hopkinson pressure bar, a dynamic impact fracturing device and a cylindrical confining pressure cylinder, the split Hopkinson pressure bar comprises a transmitting device, an incident bar and a transmission bar, wherein each of the incident bar and the transmission bar is provided with a strain gauge; the dynamic impact fracturing device is mounted at the joint of the incident bar and the transmission bar, and a sample is placed in the dynamic impact fracturing device; and the dynamic impact fracturing device is sleeved with a barrel-shaped confining pressure cylinder sleeve, and a barrel-shaped confining pressure cylinder is communicated with an oil cylinder through an oil pipe. The device has the advantages that hydraulic fracturing of rock materials in a laboratory environment is achieved, the effect is good, the device can be used for simulating hydraulic fracturing of rock samples in different stress states, and test value and guiding significance are provided for deep geotechnical engineering. The test device has the advantages of simple structure, reasonable design, fast assembly, convenient operation, manpower saving and the like.
Description
technical field [0001] The invention relates to the technical field of rock dynamic mechanics tests, in particular to a hydraulic fracturing experimental device and an experimental method based on a separate Hopkinson pressure bar. Background technique [0002] Hydraulic fracturing is a method to measure the stress in the deep crust. This method can obtain various stress parameters in the crust without the mechanical parameters of the rock involved in the calculation. It has simple equipment, simple operation, and can be used in ultra-deep drilling. With the characteristics of repeated experiments, fast measurement speed and reliable measurement results, it has been widely used in major key projects in recent years and achieved good results. The classic hydraulic fracturing method seals the test section with a packer and injects high-pressure water into it to obtain the initial fracture pressure Pi of the rock wall and the closure pressure Ps when the fracture expands to a d...
Claims
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Login to View More IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0003G01N2203/0019G01N2203/0048G01N2203/0067G01N2203/0075G01N2203/0676G01N2203/0682
Inventor 陈荣徐颖聂铮玥杨雨鑫姚伟林玉亮
Owner NAT UNIV OF DEFENSE TECH