Rock fracturing simulation test specimen with crack, preparation method for rock fracturing simulation test specimen, simulation test apparatus and simulation test method

Abstract

The invention discloses a rock fracturing simulation test specimen with crack, a preparation method for the rock fracturing simulation test specimen, a simulation test apparatus and a simulation test method, and belongs to the technical field of rock simulation tests. The rock fracturing simulation test specimen comprises a rock test specimen body, a fracturing fluid injection tube and a pouring material. The pouring material covers the rock test specimen body so that the formed rock fracturing simulation test specimen with the crack is integrally in the shape of a cuboid, a blind hole starts to be formed in an end point of the cuboid and is terminated at the rock test specimen body, the fracturing fluid injection tube is fixedly connected onto the wall of the blind hole, an accommodating space is reserved between the bottommost end of the fracturing fluid injection tube and the bottommost end of the blind hole, and a plurality of spray holes start to be formed in the wall of the blind hole and extend towards the rock test specimen body. The rock fracturing simulation test specimen is applied to the simulation test apparatus, and the simulation test method is based on the simulation test apparatus. The rock fracturing simulation test specimen, the preparation method, the simulation test apparatus and the simulation test method have the advantages that crack fracturing physical simulation can be carried out on rock masses of shale gas reservoirs by the aid of the rock fracturing simulation test specimen, the simulation test apparatus and the simulation test method, and the rock fracturing simulation test specimen, the simulation test apparatus and the simulation test method also can be used for rock masses of other tight reservoirs and accordingly are high in applicability.

Description

technical field [0001] The invention relates to the technical field of rock simulation tests, in particular to a rock fracturing simulation sample with cracks and a preparation method, the simulation test device and method. Background technique [0002] With the adjustment of the global energy structure, the requirements for environmental protection are getting higher and higher. As an efficient and high-quality clean energy, shale gas is the best choice for low-carbon consumption. The recoverable reserves of shale gas in my country are 36.08×10 12 m 3 , ranking first in the world; but because shale gas reservoirs are composed of lithified clay organic matter and minerals, although organic matter can produce rich shale gas, the gaps between these clear-textured rocks are too small, It has low permeability and is much more difficult to exploit than conventional natural gas. [0003] In order to achieve efficient mining, artificial fracture networks must be generated throug...

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Problems solved by technology

[0004] In the prior art, the physical simulation tests of shale hydraulic fracturing mostly use cube samples of 300mm×300mm×300mm. The physical simulation of fracturing has its limitations. Due to the small size of the samples, when the main fracturing is formed, The fracturing fluid will soon expand to the boundary and form a stable seepage channel, which makes it impossible to study the communication characteristics between the main fracture and the weak shale bedding surface, and makes it difficult to realize the complex fracture network structure formed in the hydraulic fracturing site. Establishing a realistic shale hydraulic fracturing multi-fracture interference and fracturing propagation model brings difficulties

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