底水油藏注水开发水淹模式探讨

Discussion on flooding pattern for bottom water reservoirs driveling by water-injection

程秋菊 冯文光 彭小东 刘鑫

CHENG Qiuju FENG Wenguang PENG Xiaodong LIU Xin

成都理工大学能源学院，四川成都　610059 中石化华北分公司工程技术研究院，河南郑州　450006 中海石油中国有限公司湛江分有公司，广东湛江　524057

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China Engineering Research Institute North China Branch Company of SINOPEC, Zhengzhou 450006, China Zhanjiang Branch Company, CNOOC, Zhanjiang 524057, China

在底水油藏的开发过程中，常因底水锥进而造成油井大面积水淹，能否采用注水补充压力阻止底水锥进，一直是油藏工程师关心的问题。在对我国西北某底水油藏采油井的开采动态特征进行分析后，根据工区的地质参数，分别采用数值模拟技术、流线模拟技术和虚拟示踪剂模拟技术，对底水油藏注水不见效的原因进行了分析，认为注入水的主要驱替路径是：大部分注入水优先流向底水区，然后驱动底水往生产井流动，生产井表现出明显的底水锥进特征。这种注入水的驱替路径表明：在底水油藏，注水保持油层压力的方法不能抑制底水锥进。

In the development of bottom water reservoirs, a large part of oil wells were water-flooded by bottom water coning. Whether the additional pressure caused by water injection could prevent the water coning are always the problem that petroleum engineers cares about most. After analyzing of the oil wells production dynamical performance and the geological characteristics of some bottom water reservoir located in northwest China, the numerical simulation technology; streamline simulation technology and virtual tracer simulation technology was adopt to analyze the reasons for inefficacy of water flooding treatment in this reservoir. Through analysis, we found out that most injected water flow to the bottom water area first, and then drive the bottom water flowing to the bottom of oil wells. At the same time, production wells displays obviously bottom water coning characteristic. The flooding path of injected water indicates that, in the bottom water reservoirs, bottom water coning cannot be restrained by maintaining reservoir pressure due to artificial water injection.