EVALUATION OF EOR FOR ONSHORE OIL FIELDS IN CHINA STRATEGY STUDY AND POTENTIALITY EVALUATION OF EOR FOR ONSHORE OIL FIELDS IN CHINA Shen Pingping Yuan Shiyi Han Dong and Li Fangming, Research Institute of Petroleum Exploration & Development, CNPC,Beijing 100083, China Abstract. Based on the first potentiality evaluation and assimilating the experiences and lessons learned from the EOR applications in China, the strategy study and the second potentiality evaluation of EOR for 17 oil fields have been studied. The results show that with the technology available at present, 1158 million tons recoverable reserves can be increased, being 11% of the evaluated proven reserve of 10136 million tons. The study also attempts to determine the role that improvements in technology will play in the future development of the remaining resource. It shows that the chemical floodings, especially polymer flooding, demonstrate great potential for application in China. The developing strategy and future planning for onshore oil fields in China are proposed on the basis of the evaluation. of technology and economy were recognized.
In general, the remaining oil constitutes a huge target for future recovery operations due to the Nearly two-thirds of all oil ever non-marine deposit of reservoir characterized discovered in the onshore oil fields of China as serious heterogeneity. With the technology will remain in the reservoir at the conclusion available at present, 1158 milliom tons of conventional oil recovery processing. As the recoverable reserve can be increased on the ever increasing demand due to the rapidly basis of evaluated proven reserve of 10136 growing national economy has continued to million tons, and the 11% of recovery is exceed supply, and the discovery of new attainable. It is also equivalent to 3500 million reserve becomes harder than ever before, this tons new discovery based on the average massive quantity remains as a significant target recovery of 33% in all onshore oil fields. for China's future oil production. The study attempts to determine the role Since 1950's, China's onshore oil that improvement in technology will play in industry has made unremitting efforts on the the future development of remaining resource. studies of EOR technology. Polymer flooding It shows that the most applicable EOR technique, after testing in the pilot and technique in commercial scale is polymer expanded demonstration test, has been applied flooding regarding the limitation both in the commercially in the onshore oil fields of technology and economy. In addition, the China, and becomes one of matured application and further development of ASP succeeding techniques for oil fields flooding require a technical progress to solve development after water injection. the problems occurred in practice and to The oil production of polymer flooding reduce cost. The developing strategy and has exceeded 8 million tons annually since future planning