稠油冷采用冻胶分散体调驱体系的相互作用机制

目的 旨在有效解决稠油化学冷采过程中降黏剂窜流现象严重、油藏动用效率低的问题，支撑稠油绿色高效开发。方法 基于稠油冷采降黏剂高效降黏洗油与冻胶分散体调剖剂储层调控的协同效应，采用复配方式构建了稠油冷采用冻胶分散体调驱体系，测试其基本性能，并使用界面扩张流变仪以及流变仪，考查了体系的界面流变特性和剪切应力特性。结果 体系由质量分数为0.06%～0.12%的冻胶分散体和质量分数为0.05%～0.15%的降黏剂组成，为粒径均一的低黏流体，能够降低界面张力并乳化稠油，降黏率达到95%以上。体系中降黏剂在油水界面的吸附行为决定了体系的乳化降黏能力，降黏剂通过吸附在冻胶分散体的表面提高了体系的聚结稳定性，并考查了组分含量及油藏条件对以上过程的影响。结论 构建了一种兼具储层调控和高效降黏能力稠油冷采用冻胶分散体调驱体系，探明了体系中各组分间的相互作用机制，为稠油化学冷采提供了技术支持。

Interaction mechanism of dispersed particle gel profile control system for heavy oil cold production

ObjectiveThis study aims to effectively address the issues of severe viscosity reducer channeling and low reservoir sweep efficiency during the heavy oil cold production process, and to support the green and efficient development of heavy oil. Methods Based on the synergistic effects of efficient viscosity reduction using viscosity reducer and reservoir conformance control using dispersed particle gel in heavy oil cold production, the dispersed particle gel profile control system for heavy oil cold production was established by compounding method. The basic performance of this system was tested, and the interfacial rheological properties and shear stress characteristics were investigated by using an interfacial expansion rheometer and a rheometer. ResultsThe system was composed of 0.06 wt%-0.12 wt% dispersed particle gel profile and 0.05 wt%-0.15 wt% viscosity reducers. It was a uniform, low-viscosity fluid which could reduce interfacial tension and emulsifie heavy oil, and achieve a viscosity reduction rate of over 95%. The adsorption behavior of viscosity reducers at the oil-water interface determined the emulsification and viscosity reduction capacity of the system. The viscosity reducer improved coalescence stability of the system by adsorbing on the surface of the dispersed particle gel. Additionally, the study investigated the impact of component concentrations and reservoir conditions on these processes. ConclusionA novel system was constructed which both has reservoir profile control ability and efficient viscosity reduction capability. The interaction mechanism among system components was systematically explored, which provides technical support for the chemical cold production of heavy oil.