二氧化碳驱提高采收率技术探讨.pdfVIP

氧化碳驱提高采收率技术探讨 皓 任华敏 阚翔 （中国石化东北油气分公司 吉林 长春 130062 ） [ 要] 二氧化碳作为提高采收率的驱油剂已研究多年，室内和现场试验都曾表明它是一种有效的 驱油剂。它能够提高原油采收率的原因基于以下几个方面：一是因为二氧化碳易溶于原油；再是因为二氧 化碳易溶于水；更为重要的是，二氧化碳可促进原油中的轻质烃类（C2 ～C30 ）被抽提出来，从而使残余油 饱和度明显降低。同时，在不同原油的成分、温度和压力条件下，二氧化碳具有无限制地与原油混相的能 力，实际上可以达到很好的驱油目的。 据国内外有关资料统计，用二氧化碳驱油若能达到混相状态，油田的最终采收率可达60-70%；若以非 混相驱油，油田最终采收率也可达 50%以上。广泛的适应性和成本低廉、成效显著、可回收重复利用的特 点，使二氧化碳驱油已成为国内外三次采油的主要手段。 [关键词]CO 驱，提高原油采收率（EOR ）,混相驱，非混相驱，CO 吞吐 2 2 Technology of Enhanced Oil Recovery by Carbon Dioxide Flooding Cui hao Ren huamin Kan xiang Northeast Oil and Gas Branch, Sinopec, Changchun 130062, Jilin, China ） Abstract:Carbon dioxide as a displacing agent to enhance oil recovery has been studied for many years, laboratory and field tests have shown that it is an effective oil displacement agent. It can cause enhanced oil recovery based on the following aspects: first, because carbon dioxide is soluble in oil; then because carbon dioxide is soluble in water; more importantly, carbon dioxide can promote the light hydrocarbons in crude oil ( C2 ~ C30) has been extracted out, so that the residual oil saturation decreased significantly. At the same time, in different crude oil composition, temperature and pressure conditions, carbon dioxide has the unlimited ability miscible with crude oil, in fact, flooding can achieve a good purpose. According to international statistics, the use of carbon dioxide miscible flooding if the state meet, the ultimate oil recovery up to 60-70%; if immiscible displacement of oil, the ultimate recovery of oil is also up to 50% or more. A wide range of adaptability and low cost, the results are remarkable features recyclable reusable, so that carbon dioxide flooding has become the primary means of enhanced o