鄂尔多斯盆地蒲家沟油区长7超低渗透油层开发实践与初步认识

蒲家沟油区长7储层平均渗透率为0.44×10^-3 μm2,平均孔隙度为9.2％,属特低孔超低渗油田.储层物性差,油藏压力低,开发初期单井产量低、递减快、开发初期效果较差.针对油田开发过程中出现的主要问题,在油藏地质研究基础上,通过岩心观察、裂缝监测资料加深了超低渗储层的地质认识,并结合现场开发实践,运用井网、压裂设计、同步注水等优化措施,实现了较好的开发效果,取得了一定的经济效益和社会效益,积累了丰富的现场经验,为该区下一步开发奠定了坚实的基础.

Practice and Cognition of Waterflood Development in Chang 7 Ultra-low Permeability Reservoir of Pujiagou Oil Region in Ordos Basin

The average permeability is 0.44×10^-3 μm2, average porosity is 9.2% in Chang 7 reservoir in Pujiagou oil region, and it is belonged to the low porosity and ultra - low permeability oilfield. The reservoir physical proper- ties is poor, and reservoir pressure is low, develop initial presentation has some unfavorable performance such as the well production is low, diminishing fast. Followed by waterflood of synchronous implementation, well network optimization and fracturing wells and other measures designed to achieve a preferable effect of the development, and achieved a certain economic and social benefits, has accumulated rich experience in the field experience, and the next step for the oil region development has laid a compact foundation.