A New Well Pattern for Enhancing Waterflood Performance of Ultra-low Permeability Reservoir in Changqing Oilfield
Because the development of ultra-low permeability reservoir is relative to fracture system, suitable well pattern arrangement is very significant for effective flooding management.There were three kinds of well pattern used to waterflood in Changqing oilfield: square inverted nine-spot, rhombus inverted nine-spot and rectangular five-spot pattern, according to the degree of fracture growth.In view of the defects of these well pattems in the development of ultra-low permeability reservoirs, a new well spacing concept is developed.Numerical simulations are carried out to illustrate the adaptability and strong points of this new well pattem.For this well pattern, on the one hand, the distance between producers and injectors along the fracture direction is widened and thus massive fracturing can be conducted to enhance oil productivity and water injection, and on the other hand, a high producer/injector ratio ensures high oil recovery rate in early stage.Besides, this new well pattem has a great ability of adjustment.Field application showed a remarkably well producing performance.
ultra-low permeability reservoir modified rhombus well pattern suitability natural fractures oil recovery rate
Zhang Zhang He Shunli Zhang Haiyong
China University of Petroleum, Beijing, China
国际会议
湖北荆州
英文
501-506
2013-05-18（万方平台首次上网日期，不代表论文的发表时间）