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油气两亲表面活性剂促进CO与原油混相性的研究。

Study on Oil and Gas Amphiphilic Surfactants Promoting the Miscibility of CO and Crude Oil.

作者信息

Kuang Nianjie, Yang Shenglai, Yuan Zhongtao, Wang Meng, Zhang Zheng, Zhang Xisheng, Wang Mengyu, Zhang Yuxiang, Li Shuai, Wu Jianbang, Lv Wenfeng

机构信息

State Key Laboratory of Petroleum Resources and Exploration, China University of Petroleum Beijing, Beijing 102249, China.

China Petrochemical Corporation, Southwest Petroleum Bureau, Chongqing 402160, China.

出版信息

ACS Omega. 2021 Oct 5;6(41):27170-27182. doi: 10.1021/acsomega.1c03822. eCollection 2021 Oct 19.

DOI:10.1021/acsomega.1c03822
PMID:34693137
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8529672/
Abstract

In order to cope with the global climate crisis, carbon capture, utilization, and storage are the key technologies to achieve carbon neutrality, and it is an elegant geological utilization method for the oil and gas industry to improve the recovery rate of crude oil by using CO. However, in practical applications, the problem of low miscibility of CO and crude oil, resulting in low oil displacement efficiency, cannot be avoided. Thus, finding an appropriate method to increase the utilization rate of CO is a worth in-depth study. In light of this, this paper carries out the study on improving the CO flooding efficiency by using oil and gas amphiphilic surfactants. First of all, according to the molecular structure theory and the solubility experiment of surfactants in CO, five kinds of surfactants and two kinds of additives with good performance of oil and gas were selected. Then, three experiments were conducted to explore the mechanism of the selected surfactants. The main mechanism of promoting the miscibility of CO-crude oil is to reduce the interfacial tension of the oil and gas phases, followed by increasing the volume expansion of crude oil and reducing the viscosity of crude oil. Finally, through the slim tube displacement experiment, the oil displacement efficiency effect of adding the compound systems of SPO5/n-pentanol was simulated. The results show that the oil displacement efficiency is significantly higher than that of pure CO flooding, and the pressure of miscibility reduces at the same time. The selected reagents have a good effect of promoting miscibility. Therefore, this is an effective method to improve the geological utilization of CO.

摘要

为应对全球气候危机，碳捕获、利用与封存是实现碳中和的关键技术，利用二氧化碳提高原油采收率对油气行业而言是一种出色的地质利用方法。然而，在实际应用中，二氧化碳与原油混溶性差导致驱油效率低的问题难以避免。因此，寻找合适方法提高二氧化碳利用率值得深入研究。鉴于此，本文开展了利用油气两亲表面活性剂提高二氧化碳驱油效率的研究。首先，依据分子结构理论及表面活性剂在二氧化碳中的溶解度实验，筛选出性能良好的五种表面活性剂和两种添加剂。然后，通过三项实验探究所选表面活性剂的作用机理。促进二氧化碳与原油混溶的主要机理是降低油气相间的界面张力，其次是增加原油的体积膨胀并降低原油粘度。最后，通过细管驱替实验模拟了添加SPO5/正戊醇复合体系的驱油效率效果。结果表明，驱油效率显著高于纯二氧化碳驱油，同时混溶压力降低。所选试剂具有良好的促进混溶效果。因此，这是提高二氧化碳地质利用效率的有效方法。

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