Method for increasing fracture stimulated reservoir volume of shale gas

Abstract

The invention provides a method for increasing the fracture stimulated reservoir volume of shale gas. The method includes the following steps that firstly, the brittleness index of shale is fine analyzed and evaluated; secondly, a proper number of shower holes are selected; thirdly, induced fracturing testing is conducted on each segment; fourthly, acid pretreatment is conducted; fifthly, the amplitude of shale original horizontal stress difference relative to major fracture net pressure is judged, and a fracture is further treated; sixthly, balls are thrown according to the cluster number of perforated holes and the total number of the perforated holes. By fine analyzing and evaluating the brittleness index of shale, selecting reasonable perforated hole parameters, conducting induced fracturing testing on each segment of a horizontal well, well controlling the major fracture net pressure and well controlling a diverting agent in the fracture, generation of network fractures or volume fractures is improved in the shale gas well fracturing process, accordingly the fracture stimulated reservoir volume is increased, and finally the fracture flow conductivity is improved after shale gas fracturing.

Description

technical field [0001] The invention relates to a method for increasing the volume of fracture stimulation in shale gas fracturing. Background technique [0002] Shale gas is an unconventional natural gas resource with great potential in recent years. Fracturing technology is a key technology for shale gas development. Based on the characteristics of shale gas reservoirs, in order to ensure the economic effectiveness of its development, it must be Volume fracturing (SRV), that is, network fracturing of shale reservoirs from the three-dimensional directions of length, width, and height to form network fractures with effective conductivity. [0003] The current shale gas volume fracturing technology mainly adopts multi-cluster perforation, large liquid volume, large displacement, and low sand-liquid ratio, etc. It is not known whether a real three-dimensional network fracture or volume fracture can be formed. Well, because the current domestic fracture monitoring work is far ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that it is difficult to generate network fractures or volume fractures after shale gas fracturing, a method for increasing the volume of fracture stimulation with shale gas was invented, which can effectively solve the problem of difficult fracture initiation, single fracture shape, and low complexity of fractures and other problems