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Effectiveness and sensitivity analysis of solution gas re-injection in Baikouquan tight formation,Mahu sag for enhanced oil recovery

引用

Petroleum 2020年第3期6卷 253-263页

作者： Bing Wei Tao Song Yan Gao Hua Xiang Xingguang Xu Valeriy Kadet Jinlian Bai Zhiwei Zhai State Key Laboratory of Oil and gas reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China XinJiang Oilfield PetroChinaKaramay834000China Gubkin Russia State University of Oil and gas Moscow119991Russia Energy Business Unit The Commonwealth Scientific and Industrial Research Organization26 Dick Perry AvenueKensington6152PerthAustralia Exploration and Development research Institute of Qinghai Oilfield Petro ChinaDunhuang736202China Department of Science Technology and IndustryShanxi Institute of EnergyJinzhong030600China

To address the fast productivity decline of the horizontal wells and low oil recovery during natural depletion in Baikouquan formation,the approach of solution gas re-injection was proposed with the primary objective of further developing this ***,a field-scale numerical compositional reservoir model was built up based on the formation properties and then the effects of permeability,fractures and formation stress on the production dynamics were thoroughly investigated.A sensitivity analysis,which can correlate the oil recovery with these parameters,was also *** results showed that the re-injection of solution gas could remarkably retard the production depletion of the horizontal wells thereby improving the oil *** oil recovery rate increased with permeability,fracture half-length,fracture conductivity,and formation *** regard to the fracture distribution,it was found that the interlaced fracture outperformed the aligned fracture for the solution gas *** influence of the formation stress should be carefully considered in the production *** analysis indicated that the formation dip was the paramount parameter,and the permeability,fracture half-length,and fracture conductivity also played central *** results of this study supplement earlier observations and provide constructive envision for enhanced oil recovery of tight reservoirs.

关键词： Tight oil reservoir Mahu sag solution gas re-injection Numerical simulation Fracturing Sensitivity analysis

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