Abstract: With the further development of Changqing ultra-low permeability oilfield, contradiction between injection and production is increasingly prominent and there is plenty of remaining oil enrichment areas in the reservoir plane. The conventional fracturing measures cannot change the artificial fracture extension direction, and have low producing degree to the remaining oil enrichment areas. The temporary plugging agent G519 can flow through pump and boost pressure fast, which can effectively improve the net pressure in fissures in the process of fracturing, get rid of control of ground stress field to the fractured fissures extension direction, divert the fractures, make the different branch cracks from the main fracture extension direction, and realize the purpose of producing dead oil area reserves. The field practice shows that the application of temporary plugging agent for fracturing can effectively improve the production of ultra-low permeability oil field and reduce economic risks from fracturing.

摘要： 随着长庆特低渗透油田开发的深入, 注采矛盾日益突出, 储层平面存在大量剩余油富集区。常规压裂措 施无法改变人工裂缝延伸方向, 对剩余油富集区储量动用程度较低。压裂用暂堵剂G519 能过泵、升压快, 可有效提高 压裂过程中的缝内净压力, 摆脱地应力场对压裂裂缝延伸方向的控制, 实现裂缝转向, 形成不同于主裂缝延伸方向的 支裂缝, 实现动用死油区储量的目的。现场实践表明, 压裂用暂堵剂的应用可有效提高特低渗油田油井产量, 降低压 裂经济风险。

关键词: 特低渗透油田, 压裂用暂堵剂, 缝内净压力, 多裂缝系统, 动用剩余油