超临界CO₂增稠剂研究进展

Research advance in supercritical CO₂ thickeners

刘巍

Liu Wei

中国石化胜利油田分公司采油工艺研究院，山东 东营 257000

Research Institute of Oil Production Technology, Shengli Oilfield Company, SINOPEC, Dongying 257000, China

CO₂驱是目前国内外提高油藏采收率的重要方法之一，但由于存在不利的流度比、地层非均质性、天然或人工裂缝等因素，易造成注入CO₂流体发生气窜。常用的提高CO₂驱波及效率的方法有气水交替驱、CO₂泡沫驱和聚合物冻胶驱等，通过在超临界CO₂中加入增稠剂，也可提高CO2驱波及系数，提高原油采收率。文中对国内外研究的各种CO₂增稠剂进行了综述与评价，重点介绍了常见聚合物、小分子、含氟聚合物以及不含氟表面活性剂等各种类型增稠剂，同时从相行为、相对黏度测定方面介绍了CO₂增稠评价方法，对提高CO2驱波及效率的超临界CO₂增稠剂的发展方向提出了建议。

At present, CO₂ miscible flooding has been an important method to improve oil recovery factor in the world. However, due to the irrational mobility ratio among gas, oil and formation salt water, formation heterogeneity and natural or artificial fracture, the supercritical CO₂ flows through the formation and gas channeling occurs. Common methods of improving the sweep  efficiency of CO₂ flooding include WAG, CO₂ foam and polymer gel. Addition of thickener in supercritical CO₂ can be used for improving the sweep efficiency of CO₂ flooding to enhance the oil recovery. This paper reviewed and evaluated different kinds of supercritical CO₂ thickeners and evaluation methods of CO₂ thickening studied by foreign researchers. All kinds of thickeners such as common polymer, small molecular nitrogen polymer and the surfactant without nitrogen are mainly introduced. At the same time, the evaluation methods of CO₂ thickening are also introduced from phase behavior and relative viscosity determination. Finally, some suggestions on development direction of supercritical CO₂ thickeners were put forward.

10.6056/dkyqt201205028