Automatic diagnosis method of shale gas seam network fracturing construction pressure curve

Abstract

The invention discloses an automatic diagnosis method of a shale gas seam network fracturing operation pressure curve. The method includes the following steps that S1, a shale gas seam network fracturing bottom hole net pressure conversion model is established by using a fluid dynamics theory; S2, a bottom hole net pressure dynamic fitting model is established by using a numerical analysis theory;S3, a fracture extension theory is applied to establish a fracture extension pattern recognition model; and S4, the shale gas seam network fracturing operation pressure curve is automatically diagnosed by the numerical calculation process combined with the S1, S2 and S3. According to the automatic diagnosis method of the shale gas seam network fracturing operation pressure curve, the automatic, fast and accurate diagnosis and analysis of the shale gas seam network fracturing operation pressure curve are realized, and the problems of complex and changeable characteristics of the shale gas seamnetwork fracturing operation pressure curve and the lack of a targeted automatic diagnosis method of the pressure curve are solved.

Description

technical field [0001] The invention relates to the technical field of shale gas development, in particular to a method for automatically diagnosing pressure curves of shale gas fracture network fracturing operations. Background technique [0002] Hydraulic fracturing construction pressure curve diagnosis is an important part of fracturing technology theory. Construction pressure is the external manifestation of fracture dynamic expansion mechanical behavior, and fracture dynamic expansion is closely related to formation characteristics such as reservoir rock mechanical properties, fracturing fluid properties, in-situ stress distribution, and natural fracture development status. Therefore, through the analysis of the construction pressure curve, the hydraulic fracture extension behavior can be identified, the formation characteristics can be judged, and the basis and guidance can be provided for the optimal design of fracturing and the adjustment of field construction parame...

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Problems solved by technology

[0006] In view of the above problems, the present invention provides an automatic diagnosis method for shale gas fracture network fracturing construction pressure curve, the purpose is to solve the complex and changeable characteristics of shale gas fracture network fracturing construction pressure curve, and the lack of targeted automatic diagnosis of pressure curve method problem

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