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Start Over Author "Chen, Guo-Li" Publisher elsevier bv
15 results on '"Chen, Guo-Li"'

15. Assessment of miscibility effect for CO 2 flooding EOR in a low permeability reservoir

Author

Hassan Butt, Ren Shaoran, Huang Haidong, Ren Bo, Chen Guo-li, Ren Jianfeng, Wang Yanqing, Huang Feng, and Zhang Liang

Subjects
Light crude oil, Petroleum engineering, business.industry, 020209 energy, Fossil fuel, 02 engineering and technology, Geotechnical Engineering and Engineering Geology, Miscibility, Co2 flooding, Permeability (earth sciences), Fuel Technology, 020401 chemical engineering, Natural gas, Oil production, 0202 electrical engineering, electronic engineering, information engineering, Low permeability, 0204 chemical engineering, business, Geology
Abstract

H59 block in Jilin Oilfield was selected as a pilot site for CCS (carbon capture and storage) project. The block is of a light oil reservoir with average permeability of 3.5 mD and well-developed natural fractures. CO 2 separated from a nearby natural gas reservoir was injected into the oil block during six years operation, with nearly 0.26 million tons of CO 2 (0.32 HCPV) has been injected. In order to evaluate the miscibility effect of CO 2 flooding, injection and well production data were analyzed, including injection pressure, bottom hole flowing pressure (BHFP) of producer wells, CO 2 breakthrough time and produced oil and gas compositions. Reservoir pressure distribution during CO 2 injection was figured out based injection pressure and BHFP using the Kriging interpolation method, and the varying miscible region was illustrated in pressure contours. The analysis results show that CO 2 injection can significantly increase oil production, but the size of the miscible region can be greatly reduced after early CO 2 breakthrough, which can cause BHFP and oil production declining. In comparison with the experimental data of core flooding with CO 2 at different modes, the produced oil composition data indicate that CO 2 flooding in the field was more likely in near miscible or immiscible modes, though the injection pressure was higher than the MMP, which can be attributed to unexpected early CO 2 breakthrough and low permeability nature of the reservoir.

Published
2016

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