表面活性剂提高致密油藏注水吞吐效果的机理
Mechanism of surfactant improving injection huff and puff effect in tight reservoir
张立亚 1王建波 1王科战 1陈光宇 1王洪宝2
作者信息
- 1. 中国石化东北油气分公司,吉林长春 130000
- 2. 山东科技大学,山东青岛 266555
- 折叠
摘要
注水吞吐作为致密油藏开采的一种经济、有效方法,已成功应用于各大油田.表面活性剂可提高致密油采收率,其作用机理尚需深化研究.研究将吞吐过程分为渗吸采油和反向驱替采油阶段,阐述表面活性剂对其作用规律.结果表明,在渗吸采油阶段,表面活性剂降低了渗吸采收率,但减小了原油从岩石表面剥离难度.在反向驱替采油阶段,表面活性剂可有效提高驱替采收率,同时大幅降低驱替压力.两性表面活性剂表现最佳,在清水的基础上提高采收率约5.00%,降低驱替压力7.00 MPa.其主要机理为降低界面张力、改变润湿性,减小原油从岩石表面剥离难度;减小毛管力和贾敏效应阻力,降低驱替压力.结果为表面活性剂在致密油藏注水吞吐的现场应用提供了理论依据.
Abstract
Water injection huff and puff have been successfully applied to many major oil-fields as an economical and effective method for producing tight reservoirs.Surfactants can enhance tight oil recovery,but their mechanism needs further study.The huff and puff pro-cess is divided into imbibition recovery and reverse displacement recovery,and the effect of surfactants on it is described.The results show that the surfactant can reduce the imbibition recovery but reduce the difficulty of oil stripping from the rock surface.In the reverse dis-placement recovery stage,surfactants can effectively improve the displacement recovery effi-ciency and significantly reduce the displacement pressure.Amphoteric surfactants showed the best performance,increasing oil recovery by about 5.00%based on clean water and re-ducing displacement pressure by about 7.00 MPa.The primary mechanism is to reduce the interfacial tension,change the wettability,and reduce the difficulty of oil stripping from the rock surface.Reduce capillary force and resistance of Jamin effect,and reduce displacement pressure.The results provide a theoretical basis for applying surfactants in injection huff and puff in tight reservoirs.
关键词
致密油藏/注水吞吐/表面活性剂Key words
tight oil reservoir/water injection huff and puff/surfactant引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据