Investigation of the dynamic capillary pressure during displacement process in fractured tight rocks

AICHE Journal - Tập 66 Số 1 - 2020
Ying Li1,2, Haitao Li1,2, Shengnan Chen3, Hongwen Luo3,1,2, Chang Liu3,1,2
1School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu, China
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China
3Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Canada

Tóm tắt

AbstractThis work investigates the dynamic capillary pressure during the displacement process in fractured tight rocks, through specially designed experiments on fractured and intact core samples. The dynamic capillarity coefficient of matrix and the multiphase flow behaviors are also obtained. Results have shown that the dynamic capillary pressure of the matrix becomes around 5–20% higher after the fracturing treatment. The lower and less variable values of dynamic capillarity coefficient of matrix illustrate a weakened dynamic effect and a more uniform displacement front. Moreover, time derivative of water saturation is increased significantly with fractures. Finally, oil relative permeability after fracturing is lower than its value of the intact core at high water saturations. A dynamic capillarity coefficient model for matrix, which includes the influence of fractures, is derived and verified with the averageR2more than 0.95. This wok helps to understand and predict multiphase flow in fractured tight porous media.

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AICHE Journal

Tập 66 Số 1

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