Research Institute of Petroleum Industry (RIPI) Journal of Petroleum Science and Technology 2251-659X 4 2 2014 10 10 RESEARCH ON CO2 FLOODING FOR IMPROVED OIL RECOVERY IN WATER FLOODING ABANDONED RESERVOIRS 35 42 402 10.22078/jpst.2014.402 EN Baolun Niu Production Engineering and Technology Institute, Zhongyuan Oilfield Branch Company, Sinopec, Puyang, Henan 457001, P R of China Ruijian Deng Zhongyuan Oilfield Branch Company, Sinopec, Puyang, Henan 457001, P R of China Yiqing Lin School of Foreign Languages, Xi'an Shiyou University, Xi'an, Shaanxi Province,710065, P. R. China Xinrong Wu Production Engineering and Technology Institute, Zhongyuan Oilfield Branch Company, Sinopec, Puyang, Henan 457001, P R of China Zhang Zhang Oil and Gas Development Company, Zhongyuan Petroleum Engineering Company, Sinopec, Puyang, Henan 457001, P R of China Changhua Yang Production Engineering and Technology Institute, Zhongyuan Oilfield Branch Company, Sinopec, Puyang, Henan 457001, P R of China Weidong Yang Production Engineering and Technology Institute, Zhongyuan Oilfield Branch Company, Sinopec, Puyang, Henan 457001, P R of China Zhaomin Li School of Petroleum Engineer, China University of Petroleum, Qingdao, Shandong Province, 266580, PR of China Shaoran Ren School of Petroleum, China University of Petroleum, Qingdao, Shandong province, 266580, PR of China Journal Article 2013 07 06 CO2 injection is an effective technique for improved oil recovery in light oil reservoirs, especially for water flooding abandoned reservoirs. In this study, the lower part of Es1 reservoirs in Pucheng oilfield was introduced as the target reservoir. By studying the minimum miscible pressure in CO2 flooding, the reservoir could achieve miscible flooding. Long core displacement experiments proved that water alternating CO2 flooding could significantly improve the recovery. For the reservoir characteristics, anti-corrosion technology in the process of injection was researched, and the H-20 inhibitor was screened. A channeling blocking agent in combination with the delayed expansion of gel particles and cross-linked copolymer was used to control the gas fluidity. The Pu 1-1 well groups were optimized to conduct a field trial. The cumulative injected liquid CO2 was 19219.95 ton, 0.248 PV and the cumulative increasing oil was 4520.9 t. The predicted recovery will increase by 8.3%. The successful implementation of the project can provide technical attempt for completion of energy to succeed and energy-saving emission reduction targets.

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