表面活性剂与页岩油岩石和流体作用机理的试验研究

Experimental Study on the Interaction Mechanism of Surfactant with Shale Oil Rock and Fluid

韩飞

HAN Fei

中国石油天然气股份有限公司冀东油田分公司井下作业公司，河北唐山　063200

Downhole Service Company of PetroChina Jidong Oilfield, Tangshan, Hebei 063200

页岩油藏由于特殊的成藏模式和储层特征，储层非常致密，纳米级孔隙、喉道发育，原油流动阻力大，页岩油整体的采收率较低。通过开展接触角、界面张力和洗油试验等研究，明确不同类型的表面活性剂与页岩油岩石和原油之间相互作用的机理，判断是否可以采用表面活性剂来提高页岩油采收率。试验结果表明，表面活性剂可以改变页岩油岩石表面润湿性、降低界面张力，并能起到乳化的作用，最终实现提高洗油效率的效果。

Due to the special accumulation mode and reservoir characteristics of shale oil reservoirs, the reservoirs are very dense, with nano-scale pores and throats are developed, which results in high flow resistance of crude oil and low overall recovery of shale oil. Through the study of contact angle, interfacial tension and oil washing tests, the mechanism of interaction between different types of surfactants and shale oil rocks as well as crude oil is clarified, in order to judge whether the surfactant can be used to improve shale oil recovery. The results show that surfactant can change the surface wettability of shale oil rocks and reduce the interfacial tension, and finally realize the effect of improving the efficiency of oil washing.

https://doi.org/10.3969/j.issn.1008-2336.2020.04.047