A physical simulation device and method for radial hole hydraulic fracturing of unconsolidated sandstone

Abstract

The invention relates to an apparatus and a method for physically simulating the hydraulic fracturing of the radial aperture of a loose sandstone. The apparatus for physically simulating the hydraulic fracturing of the radial aperture of the loose sandstone comprises a pumping device, a middle container, a fracturing liquid pipeline, a simulation shaft, a simulation radical aperture, a fracturing test piece and a sound acquisition device. The apparatus , adopting the above technical scheme, has a simple structure, is convenient to use, and presets the radical aperture through adopting a n appropriate technology during experiments in order to guarantee that the porosity in the radical aperture area is obvious than the porosity of a surrounding rock sample and real-time monitoring of the expansion and extension condition of a crack in a test piece during fracturing is avoided.

Description

Technical field [0001] The invention relates to a physical simulation method, in particular to a physical simulation device method capable of simulating the radial hole hydraulic fracturing process of loose sandstone, and simultaneously monitoring and proving the crack initiation position and extension direction. Background technique [0002] At present, domestic research on radial drilling technology is mainly in the field of conventional reservoirs. The basic theories and methods of radial drilling for loose sandstone reservoirs are still insufficient. At the same time, hydraulic fracturing has been widely used in the oilfield development process, and the results achieved are also remarkable. However, people's understanding of the fractures produced in the fracturing process is still relatively low, such as the location and extension direction of the fractures. In the laboratory, physical simulation methods can effectively explore the law of fracture propagation during fractur...

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Problems solved by technology

For example, during the experiment, the radial holes were not pre-set by a suitable method, so that the porosity in the radial hole area was not guaranteed to be significantly greater than that of the surrounding rock samples

Furthermore, when the fracturing is over, the observation of the fracture morphology only stays on the surface of the test piece, and there is no real-time monitoring of the crack propagation and extension inside the test piece during the fracturing process.

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