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致密油藏中表面活性剂驱替原油的影响因素及表面活性剂自吸机理

Influencing Factors of Surfactant Stripping Crude Oil and Spontaneous Imbibition Mechanism of Surfactants in a Tight Reservoir.

作者信息

Cao Guangsheng, Cheng Qingchao, Liu Ying, Bu Ruixuan, Zhang Ning, Wang Peilun

机构信息

Key Laboratory of Enhanced Oil & Gas Recovery of Ministry of Education, Northeast Petroleum University, Daqing 163318, P. R. China.

No. 2 Oil Production Plant, Daqing Oilfield Co., Ltd., Daqing 163000, China.

出版信息

ACS Omega. 2022 May 26;7(22):19010-19020. doi: 10.1021/acsomega.2c02190. eCollection 2022 Jun 7.

DOI:10.1021/acsomega.2c02190
PMID:35694475
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9178765/
Abstract

Surfactants play a vital role in the working fluid during the exploitation of tight reservoirs. The main goal is to clarify the mechanism of surfactant production enhancement in the reservoir. In this paper, starting from the interface properties and emulsifying properties of surfactants, the factors affecting the stripping of crude oil by different surfactants were described in detail. Meanwhile, the imbibition experiments of cores were used to clarify the two spontaneous imbibition mechanisms of the surfactant. Namely, they are the capillary force expulsion caused by the emulsion stripping thermal diffusion-convection and the wettability change. When the interfacial tension between the surfactant and oil is in the range of 10-10 mN/m, the particle size of emulsion is less than 1 μm, and the oil stripping efficiency is greater than 58%. The imbibition is mainly caused by thermal diffusion-convection. The wetting angle of the surfactant mainly changing wettability is less than 15°, and the adhesion work is greater than 52 mN/m. Using X-ray computed tomography, the surfactant imbibition distance of different permeability types of cores was obtained. The results show that higher permeability cores have a deeper imbibition distance. The results of this paper enrich the mechanism of enhanced oil recovery by surfactants and have important implications for the exploitation of tight reservoirs.

摘要

在致密油藏开采过程中，表面活性剂在工作液中起着至关重要的作用。主要目的是阐明表面活性剂提高油藏产量的机理。本文从表面活性剂的界面性质和乳化性质出发，详细描述了不同表面活性剂影响原油剥离的因素。同时，通过岩心自吸实验，阐明了表面活性剂的两种自吸机理。即乳液剥离热扩散-对流引起的毛细管力驱替和润湿性变化。当表面活性剂与油之间的界面张力在10-10 mN/m范围内，乳液粒径小于1μm，且原油剥离效率大于58%时，自吸主要由热扩散-对流引起。主要改变润湿性的表面活性剂的润湿角小于15°，粘附功大于52 mN/m。利用X射线计算机断层扫描技术，得到了不同渗透率类型岩心的表面活性剂自吸距离。结果表明，渗透率较高的岩心自吸距离更深。本文的研究结果丰富了表面活性剂提高采收率的机理，对致密油藏的开发具有重要意义。

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