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| Numerical simulation of nitrogen stimulation for complex small fault-block reservoir |
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ZHANG Yan-yu1,2,WU Xiao-dong1,LI Hong-jun3,WANG Kang-yue4
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(1. Faculty of Petroleum Engineering in China University of Petroleum,Beijing 102249,China;2. College of Petroleum Engineering in China University of Petroleum, Dongying 257061, China ;3. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China;4. Geological Scientific Research Institute of Jiangsu Oilfield Branch Company，Yangzhou 225000，China)
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| Abstract: |
| According to the geologic conditions and present development conditions of the west Chen 2 fault block in Jiangsu Chenbao Oilfield, the influences of five sensitivity factors including liquid-producing capacity, cyclic nitrogen injection volume ，injection rate，soaking time and stimulation cycle on the nitrogen stimulation effect were analyzed by numerical simulation based on the pressure-volume-temperature experiments and phase behavior matching. The results show that the liquid-producing capacity and cyclic nitrogen injection volume have a great effect on nitrogen stimulation effect, and there are optimal values respectively. Higher values of extra oil production and oil exchange ratio are obtained in the first stimulation cycle, and the oil exchange ratio descreases in the third cycle, so the optimal stimulation time is 2 to 3 cycles. The oil production could be enhanced by increasing injection rate if the formation and equipment conditions enabled |
| Key words: nitrogen stimulation numerical simulation development indexes sensitivity factors |
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