基于冻胶分散体的非均相复合驱油体系研究

Advances in Geo-Energy Research, 2019, 3(2): 156-164

原文网址: https://www.yandy-ager.com/index.php/ager/article/view/105

        针对聚合物驱后油藏非均质性强、剩余油普遍分布而已有化学复合驱油方法应用效果有限的问题，以耐温耐盐冻胶分散体深部调驱剂、高效表面活性剂和聚合物为主要成分，建立了油藏微观调控能力强、洗油效率高的非均相复合驱强化采油新方法，作为聚合物驱后油藏进一步提高采收率的接替技术。

       本文从基于冻胶分散体的非均相复合驱油体系设计与表征、应用性能和驱油机理评价等方面开展了相应研究。结果表明：该体系具有低黏度、耐温耐盐的特点，能够聚结长大，高温老化后的界面张力仍小于1×10^-3mN/m。非均相复合驱油体系能够进入岩心深部对储集层进行微观调控，其驱替效果明显优于聚合物驱油体系、聚合物-表面活性剂二元复合驱油体系，非均相复合驱油体系主要依靠聚合物的增黏作用以及冻胶分散体的深部调驱作用来提高波及系数，而驱油作用则主要依靠表面活性剂强化洗油机理。非均相复合驱油体系在多孔介质中的调控行为有直接封堵、架桥封堵、吸附，在岩心中具有封堵、突破运移、再封堵的移动特性。

Research on heterogeneous compound flooding system based on dispersed particle gel

Hui Li, Kai Wang, Xiaodong Han, Jinding Zheng

(Published: 2019-02-22)

CorrespondingAuthor and Email:

Hui Li, lihui87@cnooc.com.cn;

ORCID: https://orcid.org/0000-0001-6202-8250

Citation: Li, H., Wang, K., Han, X., Zheng, J. Research on heterogeneous compound flooding system based on dispersed particle gel. Advances in Geo-Energy Research, 2019, 3(2): 156-164, doi: 10.26804/ager.2019.02.05.

ArticleType: Original article

Abstract：

      Aiming at addressing the problem that the remaining oil maintains wide distribution after polymer flooding and the existing chemical compound flooding systems lack extensive application, a heterogeneous compound flooding system based on dispersed particle gel(DPG) is proposed as an alternative technology for enhanced recovery after polymer flooding. This study designs and characterizes the heterogeneous compound flooding system, as well as its impact factors, and field trial performances. With the systematic viscosity and oil-water interfacial tension as evaluation indicators, the field trial performance of the heterogeneous polymer flooding system is optimized and evaluated based on DPG. The results show that the systematic viscosity is 12.1 to 17.3 mPa_s while the interfacial tension keeps constant at 10^-3 mN/m magnitude. At 80 ℃, with 60 days aging, the viscosity retention ratio of the system is over 83.5%, and the interfacial tension between oil and water is still maintained at 10^-3 mN/m. The results of core flooding experiment show that the heterogeneous compound flooding system exhibits good injection performance, moving characteristics of plugging, breakthrough migration and re-plugging. After high temperature aging, subsequent water flooding still sustains at high pressure with high resistance to erosion. Through the selective high and low permeability layers, the water injection profile is improved, and eventually oil recovery is enhanced to 20.61% after polymer flooding.

Keywords: Dispersed particle gel, heterogeneous compound flooding system, stability, performance evaluation, oil displacement mechanism.

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