Calculation Method of Maximum Imbibition Distance of Countercurrent Imbibition in Shale Reservoirs

doi:10.3969/j.issn.1006-6535.2024.04.013

Abstract

Abstract: Imbibition is an important mechanism for fracturing development in shale reservoirs,and the maximum imbibition distance is a direct indicator for evaluating the scope of imbibition,which is of great significance for the development of shale reservoirs.In order to determine the maximum imbibition distance of shale reservoirs,a calculation method of imbibition distance of countercurrent imbibition in shale reservoirs was developed according to the principles of filtration theory and numerical methods and based on the characterization of the capillary curve of shale reservoirs.The results were compared to the results of laboratory experiments so as to verify the reliability of the calculation method and analyze the influencing factors of the maximum imbibition distance.The research shows that the maximum imbibition distance increases linearly with the increase of permeability,but the time required to reach the maximum imbibition distance decreases exponentially;the ratio of oil/water viscosity has no effect on the maximum imbibition distance,however,the greater the viscosity of crude oil,the longer the time required to reach the maximum imbibition distance;when the reservoir permeability is 0.05 mD,with the contact angle of 45 ° and the interfacial tension of 50 mN/m,the maximum imbibition distance is 2.2 m,taking 170 d,which takes longer time.This study provides reference for evaluating the range of imbibition distance in shale reservoirs.

Key words: shale reservoir, imbibition, maximum imbibition distance, threshold pressure gradient, permeability

CLC Number:

TE348

Wu Zhongwei, Qin Lei, Cui Chuanzhi, Wang Yidan, Qian Yin, Huang Yingsong, Yu Gaoming. Calculation Method of Maximum Imbibition Distance of Countercurrent Imbibition in Shale Reservoirs[J]. Special Oil & Gas Reservoirs, 2024, 31(4): 103-108.

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