Imbibition Mechanism of Hydraulic Fracturing in Shale Gas Reservoir

doi:10.11885/j.issn.1674-5086.2015.03.11.05

Abstract

Abstract: To better understand the imbibition behavior in shale reservoirs during production and hydraulic fracturing operations, we investigated the imbibition mechanism and evaluated the formation damage resulting from imbibition. This paper first presents a hydro-mechanical model for a shale gas reservoir with consideration for multiple flow regimes, gas diffusion and desorption, stress sensitive effect, and capillary pressure. Then the formation damage caused by the imbibition mechanism is evaluated by quantifying facture face skin evolution during fracture cleanup and subsequent production. The simulation results indicate that (1) the imbibition has a huge influence on reservoir performance in well tests and production periods, and a high capillary pressure is the main cause behind the imbibition phenomenon and water blockage around hydraulic fractures; (2) it is possible to obtain the original gas pressure by detecting the fracture pressure of new wells with hydraulic fracturing stimulation; (3) formation damage caused by wetting phase trapping is one of the main causes impairing well productivity hydraulic fracturing of tight gas reservoirs, which should not be neglected. This research provides a theoretical foundation for a better understanding of reservoir performance of shale gas, especially for optimizing production by reducing formation damage caused by imbibition at an early period.

Key words: numerical simulation, imbibition mechanism, shale gas, hydraulic fracturing, capillary pressure

CLC Number:

TE312

LEI Zhengdong, QIN Bin, LIU Shuangshuang, YU Tao. Imbibition Mechanism of Hydraulic Fracturing in Shale Gas Reservoir[J]. 西南石油大学学报(自然科学版), 2017, 39(2): 118-124.

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