Volume fracturing method for deep shale gas prestress intervention

Abstract

The invention belongs to the technical field of shale gas development, aims to solve the problems of simple artificial fracture form, difficulty in activating natural fractures and low fracture complexity in deep shale gas fracturing transformation, and particularly relates to a volume fracturing method for deep shale gas prestress intervention, which specifically comprises the following steps of:establishing a three-dimensional geological structure model based on a deep shale gas reservoir; obtaining mechanical properties of a rock mass structural plane through tests, and determining optimized prestress intervention construction parameters; determining optimized perforation position setting parameters according to the combination relationship between the well track and the rock mass structural surface; through reservoir original rock mass structure fracturing fracture network evolution calculation, obtaining a rock mass structure surface activation rule, and determining optimized fracturing construction parameters; performing perforation operation based on the obtained perforation position setting parameters; performing prestress intervention operation based on the obtained prestress intervention construction parameters; and performing main fracturing variable displacement operation based on the obtained fracturing construction parameters; the method can effectively improve the complexity of seaming the net.

Description

technical field [0001] The invention belongs to the technical field of shale gas development, and in particular relates to a volume fracturing method for prestress intervention of deep shale gas. Background technique [0002] The breakthrough in large-scale volumetric fracturing technology for shale gas horizontal wells has triggered a shale gas revolution. At present, the exploration and development of shale gas in my country is advancing to a depth of 3,500m. According to statistics, about 60% of the deep shale gas horizontal wells have not been commercially obtained by referring to the fracturing technology of shale gas with a burial depth of less than 3,500m to realize scale-effective development. mining. The main reason is that affected by the depth of reservoir burial and complex structure, the three-dimensional principal stress of deep shale gas reservoirs presents a high value characteristic, and the shear stress threshold of natural joints, fractures and weak struct...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems in the prior art, that is, in order to solve the problems of simple artificial fracture shape, difficult activation of natural fractures and low fracture complexity in deep shale gas fracturing, the present invention provides a deep shale gas prestressed An intervening volumetric fracturing method comprising the steps of:

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