Preset fracture hydraulic fatigue fracturing design method

A design method and technology of cracks, applied in the direction of measuring devices, using applied repetitive force/pulsation force to test the strength of materials, instruments, etc., can solve the influence of amplitude and frequency. Lack of theoretical basis, lack of theoretical guidance and construction design methods, effects Difficult to assess and other issues, to achieve the effect of reducing construction difficulty and safety risks, reducing construction costs, and improving construction efficiency
CN110954419AInactive Publication Date: 2020-04-03SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2020-04-03
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention discloses a preset fracture hydraulic fatigue fracturing design method which comprises the following steps of manufacturing a rock-like material standard sample, and performing a mechanical parameter test by utilizing the sample to obtain the mechanical parameters of a rock-like material; making a sample containing a through fracture, and performing a periodic cyclic load tension andcompression failure test by using the sample to obtain a stress-strain curve, a strain frequency curve and the material parameters in a Paris formula; utilizing a finite element software to establisha rock-like material finite element model, presetting fractures and fracture sizes in the finite element model, and substituting the test results into the finite element model; loading in a circulating pressure form, obtaining the fracture propagation of the rock-like material, and determining the combination form of the amplitude and the frequency parameter of the optimal circulating water pressure load.
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Description

technical field

[0001] The disclosure belongs to the technical field of hydraulic fracturing with preset fractures in rock and soil, and in particular relates to a design method for hydraulic fatigue fracturing with preset fractures. Background technique

[0002] Hydraulic fracturing refers to a physical phenomenon that causes cracks in rock and soil mass or expands cracks under the action of water pressure. The method of hydraulic fracturing is widely used in various fields, such as pressure tunnel analysis, shale gas extraction, coal field mining, and ground stress measurement. In the field of oil and gas exploitation, my country is rich in shale gas resources, with a total reserve of about 134.42 trillion cubic meters (recoverable reserves of about 25.08 trillion cubic meters). However, due to the low porosity and permeability of shale reservoirs (general porosity If the permeability is lower than 10%, and the permeability is lower than 1mD), the formation seepage conditi...

Claims

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