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Edition and Publication:
< Natural Gas and Oil > Editorial Department
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China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
CN 51-1183/TE

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New Method for Determination of Horizontal Well Critical Output in Bottom-water Reservoir

Author of the article:Yuan Lin, Li Xiaoping, Yan Yichen

Author's Workplace：1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University; 2.PetroChina Changqing Oilfield Company Oil Production Plant 10

Key Words：Bottom-water reservoir; Horizontal well; Critical output; Cresting of bottom water; Elliptical flow

Abstract：Horizontal well critical output in bottom-water reservoir is an important basis for determining reasonable production system of oil well, prolonging water-free oil production period and improve horizontal well development effect and also an important indicator for controlling too early water occurrence in oil well. Accurate calculation of horizontal well critical output is critical in bottom-water reservoir exploitation. Based on the bottom-water cresting mechanism of bottom-water reservoir, with the help of the theory of seepage flow of bottom water coning in bottom-water reservoir vertical well, considering the constant pressure surfaces of the ellipsoid around horizontal wellhole, the principle of elliptical flow and method of family of the rectangle are applied to deduce a new formula for calculating horizontal well critical output in bottom-water reservoir. Analysis results of actual calculation examples show that there are smaller errors between calculation results obtained from the new formula and those of correction Chaperon model critical output calculation, which indicates that the new formula has good accuracy. Due to unconformity of actual seepage flow pattern of the bottom-water reservoir between the assumed conditions of Giger-Karcher model, Cheng Linsong-Fan Zifei model and Dou Hongen model, critical output calculation results have large deviation from each other. Sensitivity analysis shows that critical output increases along with increase of reservoir thickness and the ratio of wellbore location and reservoir thickness, and decreases along with increase of anisotropy coefficient.