Deep shale gas horizontal well fracturing differentiation design method based on logging data

Abstract

The invention discloses a deep shale gas horizontal well fracturing differentiation design method based on logging data. The method comprises the following steps: S1, calculating rock mechanical parameters and reservoir physical property parameters of horizontal well sections; S2, correcting the rock mechanical parameters calculated only by longitudinal and transverse waves in the S1, and calculating and obtaining corrected rock mechanical parameters; S3, calculating formation weak plane development parameters; S4, calculating a comprehensive brittleness index, a fracture network construction capability index and a horizontal section resource abundance evaluation index of the horizontal sections of the target deep shale gas well; S5, calculating a 'geology-engineering' comprehensive evaluation index of the horizontal sections of the target deep shale gas well, and drawing a curve; and S6, conducting comprehensive compressibility grading on the horizontal sections of the target deep shale gas well, and optimizing the optimal fracturing process method and the like for different horizontal well sections according to the grades obtained after comprehensive compressibility grading. The fracturing cost of a deep shale gas horizontal well fracture net can be remarkably reduced, the construction efficiency is improved, and the yield increasing effect is improved.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas stimulation and transformation, and more specifically, to a differential design method for deep shale gas horizontal well fracturing based on well logging data. Background technique [0002] my country is rich in deep shale gas resources, which are one of the important potentials for increasing the production of natural gas resources. They are mainly distributed in the south and southeast of the Sichuan Basin, Fuling Pingqiao and Jingmen. However, due to the high temperature, high pressure and high stress difference environment of deep shale, there are a series of problems such as complex three-dimensional stress, large horizontal stress difference, strong temperature-sensitive plasticity, and heterogeneous reservoirs, making it difficult to form complex fracture networks by fracturing. , bringing great difficulties and challenges to the development of deep shale gas. Therefore, it is ne...

AI Technical Summary

Problems solved by technology

However, the existing fracturing methods used in the field fail to use different fracturing methods for different regions and different well sections. Only a relatively single fracturing method is used on a large scale for fracturing construction, and the cost is relatively high But the effect is not ideal

Moreover, the factors affecting the fracture network construction ability are not considered enough at present, and the evaluation index of rock brittleness is relatively single, which fails to reflect the change of rock compactness and the internal mechanism caused by the change of mineral content.

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