大庆石油地质与开发2018，Vol.37Issue(1)：122-127,6.DOI:10.19597/J.ISSN.1000-3754.201610050
CO2细管驱油实验混相动态特征表征方法
CHARACTERIZING METHOD OF THE DYNAMIC CHARACTERISTICS OF CO2 SLIM-TUBE MISCIBLE OIL FLOODING TEST
摘要
Abstract
In the process of CO2 (carbon dioxide) oil flooding/displacement in the porous media,the dynamic or kinetic phase equilibrium of the oil and gas mixture phase will take place when the CO2-crude oil system has a certain conditions.By means of the indoor slim-tube physical simulation experiment or test,the miscible dynamic characteristics or features of the CO2-crude oil system were figured out.The experimental study results show that the CO2-crude oil system can reach the miscible conditions when the CO2 volume fraction is more than 85％;at the time of the relative volume fraction of the methane and nitrogen in the produced gas is more than 70％,the CO2 miscible flooding is turned into the evaporation gas flooding;the efficiency of the CO2 miscible flooding is the general sum of the CO2 displacement efficiency and CO2 miscibility efficiency,and moreover the CO2 miscibility efficiency can be divided into CO2 extraction efficiency and mass transfer/diffusion efficiency.The miscible characteristics or features in the transitional zone between the CO2 and crude oil were quantified and detailed,two parameters that are namad as “miscible length Lslim-tube” and “relative miscible length Lr slim-tube” were proposed.Two lengths stated above and the experimental pressures are mainly distributed and spread in two intervals in detail:(1) In the lateral direction,the Lslim-tube is 0.20-0.45 m,the Lslim-tube is 0.10-0.30 m,and the pressure is 20-40 MPa;(2) In the vertical direction,the Lslim-tube is 0.20-0.80 m,the Lr slim-tubeiS 0.10--0.50 m and the pressure is 24-32 MPa;(3 ）For the range of the coincidence,the Lslim-tube is 0.20-0.45 m,the Lslim-tube is 0.10-0.30 m,and the pressure is 24-32 MPa.The experimental research results of the CO2 oil flooding possess a certain guides for the characterization of the dynamic characteristics of the other CO2 miscible floodings.关键词
细管实验/CO2驱油/混相动态特征/表征方法Key words
slim tube test/experiment/CO2 oil flooding/displacement/miscible dynamic characteristic/characterizing method分类
能源科技引用本文复制引用
章星,韩磊,周栋华,穆总结,万涛..CO2细管驱油实验混相动态特征表征方法[J].大庆石油地质与开发,2018,37(1):122-127,6.基金项目
国家重点基础研究发展计划“973”计划项目“二氧化碳减排、储存和资源化利用的基础研究”(2011GB707300) （2011GB707300）
中国石油大学(北京)克拉玛依校区引进人才科研启动基金项目“致密油储层CO2吞吐机理及可行性研究”(RCYJ2016B-01-012). （北京）
