Initial form construction method of self-supporting fracture

Abstract

The invention discloses an initial form construction method of self-supporting fracture. The method comprises the steps that A, a target reservoir rock is acquired, and processed as a cuboid rock plate, the rock plate is divided into two pieces along the direction perpendicular to the height, and A and B rough fracture surfaces are formed; B, surface topography data of A and B fracture surfaces iscollected, noise reduction and interpolation handling are conducted, and initial height matrices A0 and B0 are obtained; C, net value handling is conducted on the fracture surfaces, and net height matrices A1 and B1 are obtained; D, reverse handling is conducted on the fracture surfaces, and reverse height matrices A2 and B2 are obtained; E, dislocation handling is conducted on the fracture surfaces, and dislocation height matrices A3 and B3 are obtained; F, contact handling is conducted on the fracture surfaces, and contact height matrices A4 and B4 are obtained; G, A4 and B4 are used to plot, and an initial form of the self-supporting fracture is obtained. According to the initial form construction method of the self-supporting fracture, the initial shape of the self-supporting fractureof a target reservoir can be constructed, and an effective guidance for yield prediction and yield potential evaluation after hydraulic fracturing is provided.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for constructing the initial shape of a self-supporting fracture in the field of hydraulic fracturing. Background technique [0002] Hydraulic fracturing technology is an important measure for stimulation of low permeability oil and gas reservoirs. Hydraulic fracturing is to use the ground high-pressure pump group to pump the fracturing fluid into the formation with a displacement exceeding the absorption capacity of the formation to generate fractures, and then continue to inject the fracturing fluid with proppant (sand grains) to make the fracture continue to extend and in It is filled with proppant. When the fracturing fluid flows back, under the action of formation pressure, the proppant plays a role in supporting the fracture in the fracture and preventing the fracture from closing, thus forming a sand filling with a certain lengt...

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Problems solved by technology

[0007] At present, domestic and foreign scholars have proposed a variety of methods for the construction of the initial shape of self-supporting fractures, mainly including random fracture shape methods, regular fracture shape methods, and fractal methods, but these methods generally have a large amount of calculation, complex calculation process, and poor construction accuracy. and other defects, it is not pertinent and practical, and it is difficult to promote

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