Analysis of Pressure and Production Transient Characteristics of Composite Reservoir with Moving Boundary

Zhixue Sun, Xugang Yang, Yanxin Jin, Shubin Shi and Minglu Wu
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Zhixue Sun: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Xugang Yang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Yanxin Jin: Shengli Oilfield Petroleum Engineering Research Institute of SinoPec, Dongying 257061, China
Shubin Shi: Shengli Oilfield Petroleum Engineering Research Institute of SinoPec, Dongying 257061, China
Minglu Wu: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2019, vol. 13, issue 1, 1-18

Abstract: The mathematical model of composite reservoir has been widely used in well test analysis. In the process of oil recovery, due to the injection or replacement of the displacement agent, the model boundary can be moved. At present, the mathematical model of a composite reservoir with a moving boundary is less frequently studied and cannot meet industrial demand. In this paper, a mathematical model of a composite reservoir with a moving boundary is developed, with consideration of wellbore storage and skin effects. The characteristics of pressure transient in moving boundary composite reservoir are studied, and the influences of parameters, such as initial boundary radius, moving boundary velocity, skin factor, wellbore storage coefficient, diffusion coefficient ratio, and mobility ratio on pressure and production, are analyzed. The moving boundary effects are noticeable mainly in the middle and late production stages. The proposed model provides a novel theoretical basis for well test analysis in these types of reservoirs.

Keywords: well test; moving boundary; composite reservoir; pressure transient analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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