Wide-net fracturing method for shale gas exploitation

Abstract

The invention discloses a wide-net fracturing method for shale gas exploitation. The wide-net fracturing method comprises the following steps: according to seismic data, geological data, logging data, gas pool data and rock mechanics data, structuring a geological model and establishing a rock seepage-stress-damage coupling model; according to the requirement of the rock seepage-stress-damage coupling model, modeling a pre-fracturing initial stress field to obtain a stress field model; according to the geological model and the stress field model, obtaining a gas pool numerical model of a research object, and coupling the geological model, the gas pool numerical model and the rock seepage-stress-damage coupling model to obtain a geological model-numerical model-FSD coupling model; according to the geological model-numerical model-FSD coupling model, confirming perforation parameters, service well sections and gas production profiles of a shale gas horizontal well; according to the confirmed perforation parameters, service well sections and gas production profiles, carrying out wide-net crack fracturing. According to the method, perforation and balanced gas production can be matched and optimized, all perforation clusters are subjected to liquid inlet to form effective cracks, and the yield of shale gas is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a wide-net fracturing method for shale gas exploitation. Background technique [0002] Analysis of long-term production data of shale gas horizontal wells shows that the effective fracturing stimulated volume (ESRV) is much smaller than the stimulated volume (SSRV) fitted by the wire network fracturing model and the stimulated volume (MSRV) of microseismic monitoring. Practice has shown that the fracturing effect of shale gas is closely related to ESRV, and the effective fracture volume formed by fracturing is a key parameter to describe shale gas fracturing, that is, the smaller the area affected by the fracturing stimulation volume (ESRV), the greater the shale gas fracture volume. The fracturing effect is also worse. [0003] Assuming that all perforation clusters have effective fluid inflow during the fracturing process, if the stripped fractures are used to...

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Problems solved by technology

[0008] However, from the production test results of shale gas horizontal wells that have been produced for more than 400 days, it is found that a considerable number of perforation clusters have not been opened, and only one cluster has opened to form effective fractures in most intervals, and the gas production profile in the horizontal section is seriously unbalanced

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