储层条件下超临界二氧化碳与原油体系最小混相压力研究  

Research on minimum miscible pressure of supercritical carbon dioxide and crude oil system under reservoir condition

作　　者：赵跃军[1,2] 宋考平[1,2] 范广娟[3] 

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆163318 [3]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《大连理工大学学报》2017年第2期119-125,共7页Journal of Dalian University of Technology

基　　金：国家重大科技专项(2011ZX05009);国家自然科学基金资助项目(51404070)

摘　　要：注二氧化碳开采原油已经成为目前世界范围内特低或超低渗透油田重点采用的提高原油采收率技术,驱油过程中较为理想的驱替形态就是能够形成二氧化碳混相驱,而最小混相压力是形成混相驱关键因素之一,因此快速准确预测最小混相压力是实现混相驱的重要环节.通过长细管驱替实验法和多种经验公式法对储层条件下超临界二氧化碳与试验区原油体系最小混相压力的预测进行了研究,并用长细管驱替实验法对各经验公式法测定的结果进行了误差分析.研究结果表明:长细管驱替实验法预测的最小混相压力为29.15 MPa;各经验公式法计算得到的最小混相压力相差较大,预测最大值为42.60 MPa,最小值为10.34 MPa,平均值为26.83 MPa;对比长细管驱替实验法测得的结果,各经验公式法预测的最小混相压力平均值的相对误差为7.96%,其中相对误差最小的是石油采收率研究所提出的PRIⅠ方法,相对误差为1.26%.Developing oii by injecting carbon dioxide has become the important enhanced oii recovery technology for the ultra-iow permeability oii field and extra-iow permeability oii field in the current world . The ideai displacement is to form carbon dioxide miscible flooding in the process of oiidisplacement. The minimum miscible pressure is one of the key factors to form miscible flooding. So it is an important part of the realization of miscible flooding to predict the minimum miscible pressurequickly and accurately. The minimum miscible pressure prediction of the supercritical carbon dioxide and crude oil system under reservoir condition of the test area is studied tdisplacement experiment method and a variety of empirical formula methods. The minimum miscible pressure predicted by the long slim tube displacement experiment method is applied to analyze therelative error of the result of the empirical formula methods. The research results show that the minimum miscible pressure predicted by the long slim tube displacement experiment method is 29. 15 M P a ; the minimum miscible pressure values calculated by the various empirical formula methods are quite different： the maximum is 42. 60 MP a, the minimum is 10. 34 M P a, and the average value is 26. 83 MPa ; the average relative error to the long slim tube displacement experiment method is7.96%. The relative error of PRI： method proposed by Petroleum Recovery In stitute is 1. 2 6 %, which is the smallest relative error among all of the empirical formula methods.

关 键 词：最小混相压力 超临界二氧化碳 混相驱 长细管驱替实验法 经验公式法 

分 类 号：TE348[石油与天然气工程—油气田开发工程]