Experimental method and device for acoustic emission diagnosis of rock sample hydraulic fracture morphology

Abstract

The invention discloses a rock sample hydraulic fracture morphology acoustic emission diagnosis experimental method and device, wherein the rock sample hydraulic fracture morphology acoustic emission diagnosis experimental method comprises the steps: a sensor array of a three-dimensional rock sample space is optimized to design, a rock sample emission speed filed is actively positioned and tested, and rock samples are done with a hydraulic fracturing physical simulation experiment, then are analyzed through sound wave arrival time recognition sound wave data, screen effective acoustic emission signals, and position acoustic emission event points in real time. Effective acoustic emission signals are analyzed through a focal mechanism and clusters, thereby obtaining extensional fracture and shear fracture spatial distribution regulations. The influence of geological stress conditions, natural fracture development degrees, net pressure construction and fluid viscosity to a hydraulic fracture extended mechanism is analyzed through many time experimental results of the hydraulic fracturing physical simulation experiment. The rock sample hydraulic fracture morphology acoustic emission diagnosis experimental method and device solves the difficult problems that effective signals in large size unconventional samples are difficult to collect and are low in positionaI accuracy.

Description

technical field [0001] The invention relates to a large-scale unconventional rock sample hydraulic fracture form acoustic emission diagnosis experiment technology, in particular to a rock sample hydraulic fracture form acoustic emission diagnosis test method and device. Background technique [0002] At present, with the large-scale development of unconventional oil and gas reservoirs such as shale gas and coalbed methane, it is necessary to conduct basic research on the mechanism of hydraulic fracture initiation and extension under complex stress conditions and geological conditions, so as to provide powerful technologies for field fracturing support and security. At present, since the actual shape of hydraulic fractures in the field cannot be directly observed, fracture information, such as fracture azimuth, length, height and scale, can only be obtained indirectly through geophysical testing methods such as well logging, micro-deformation and micro-seismic. Microseismic i...

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Problems solved by technology

[0005] The embodiment of the present invention provides an acoustic emission diagnostic test method and device for rock sample hydraulic fracture morphology to solve the problems of difficult acquisition of effective acoustic signals and low positioning accuracy in large-sized unconventional samples

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