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Stress path-based hydraulic fracturing test method

A technique of hydraulic fracturing, a test method applied in the direction of testing material strength using applied steady tension/compression

Active Publication Date: 2018-01-16
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there is currently no indoor simulation test for shale fracturing in complex stress fields

Method used

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Embodiment Construction

[0071] The invention provides a hydraulic fracturing test method based on a stress path, which can indoor study the influence of an additional disturbance stress field on the fracturing effect of shale reservoirs, and can be used to guide on-site fracturing.

[0072] The stress path-based hydraulic fracturing test method includes: figure 1 As shown, the natural rock block is cut into cube rock blocks of predetermined size. In this embodiment, natural shale is used for testing. Cutting more than two cubic rock blocks with different structural plane inclination angles, and each type of structural plane inclination angle includes more than two cubic rock blocks, for example, 3-6 pieces. The inclination angle of the structural plane can be from 0° to 90°, and rock blocks with any structural inclination angle can be cut according to the experimental requirements. After the cube rock block is cut and processed, it is polished to ensure that the non-parallelism of the end faces of t...

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Abstract

A stress path-based hydraulic fracturing test method can simulate the hydraulic fracturing process at different structural surface inclination angles, in different three-dimensional stress states andunder different disturbance loads, and a fracturing test piece and the overall test process have typical similarity to an can be in situ fractured shale reservoir. Unidirectional pressurization and depressurization and bidirectional pressurization and depressurization disturbance fracturing tests are carried out under in different levels of load stress states set on the basis of the geological depth according to stress path-free experimental design. The shale fracturing process and the rupture feature under the action of true triaxial state disturbance load lay a foundation for understanding and knowing the study of the shale volumetric fracturing effect under the influence of an additional stress field, and can provide a theoretical and technical support for onsite multi-stage multi-wellfracturing.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing stimulation in shale reservoir reconstruction, in particular to a hydraulic fracturing test method based on a stress path. Background technique [0002] With the gradual increase of shale gas exploration and production in my country, large-scale volume fracturing of shale reservoirs, as a core science and technology affecting production capacity, has been paid more and more attention. my country's marine-terrestrial sedimentary shale and shale reservoir matrix have extremely low permeability, shale physical properties vary greatly, and brittleness is lower than North American shale, which restricts the formation of three-dimensional fracture networks in shale reservoirs during fracturing operations, and cannot The effective formation of shale gas flow channels cannot achieve the purpose of industrialized mining. [0003] To solve the above problems, it is imperative to adopt new techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
Inventor 王洪建赵菲陈世仲黄志全董金玉于怀昌袁广祥姚亚明吴琦
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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