压裂过程数据对原始煤储层压力反演方法研究

doi:10.13809/j.cnki.cn32-1825/te.2022.04.003

Abstract

Abstract:

The initial formation pressure of coalbed methane（CBM） reservoir is a key parameter used for the evaluation of CBM reserves and productivity, which plays a guiding role in CBM production. Therefore, it is of great significance to accurately calculate the initial reservoir pressure of CBM reservoir. Based on the pressure potential superposition principle of the seepage mechanics theory, the pressure potential model in the process of fracturing and shut in after fracturing is established, and a method for determining the initial reservoir pressure of CBM reservoir is proposed by using the wellhead pressure drop data in the shut-in stage of hydraulically fractured gas well under two conditions: ignoring or considering the fracture network permeability change in the process of fracturing and shut in after fracturing. And then, a field application is carried out. From the fitting results of the case study, it can be seen that the linear relationships for both methods are obvious, indicating that the established methods are effective. From the perspective of interpretation accuracy, the method of considering the fracture network permeability change after fracturing involves more data points in fitting, and the fracture network permeability change during fracturing and after fracturing is an indisputable fact, so the interpretation result by using the method considering the fracture network permeability change is more reliable. If the change process of fracture network permeability of coal formation during shut in after fracturing is ignored, the interpreted stable permeability of fracture network and initial reservoir pressure will be high. Since this method can not only be used to determine the initial reservoir pressure, but also to determine the stable permeability of fracture network after fracturing and evaluate the change trend of fracture network permeability, it provides a basis for the classification of CBM reservoir types, CBM reserve calculation, fracturing effect evaluation, and optimization design of drainage and production system.

Key words: initial coal reservoir pressure, coalbed methane（CBM） reservoir, hydraulic fracturing, wellhead pressure, fracture network permeability.

CLC Number:

TE32

SHI Juntai,LI Wenbin,ZHANG Longlong,JI Changjiang,LI Guofu,ZHANG Sui'an. An inversion method of initial coal reservoir pressure using fracturing process data[J].Petroleum Reservoir Evaluation and Development, 2022, 12(4): 564-571.

Figures/Tables 6

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An inversion method of initial coal reservoir pressure using fracturing process data

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