CO2驱油封存前缘计算与分析
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中图分类号：TE312 文献标志码：A
Abstract：To accurately monitor the front position in the process of CO2 flooding and sequestration，two calculation methods for the front of CO2 flooding and sequestration were established.According to the fluidity change characteristics in the three regions of CO2 flooding and sequestration，combined with the response characteristics of fluidity change in the field well test curve at different flow stages，the flow stage of the CO2 flooding field well test curve was divided， the response time of the CO 2 front on the wel test curve was identified，and the calculation formula of the CO2 flooding and sequestration well test front was obtained through welltest analysis. On the basis of the dynamic migration process of CO flooding and sequestration plume，combined with Buckley-Leverett oil displacement theory，the mathematical model of CO 2 flooding and sequestration non-piston displacement was established and solved，and the calculation formula of CO 2 flooding and sequestration non-piston displacementfront was obtained.Thetwocalculation methods wereapplied tothe field practice，and the front positions of the pure CO2 zone and the CO2 -crude oil mixed zone were obtained respectively，and the reliability of the twocalculationmethodswasverifiedbythenumericalmodeling method.Theresults indicate thattherelativeerrorbetween the two proposed CO2 front calculation and the numerical simulation results does not exceed 15% ，meeting the accuracy requirements for field applications.This study provides anew way to solvethe problems of highcost and long time for CO2 front monitoring.
Keywords： CO2 flooding；front；well test；plume；mix zone；numerical simulation
CO2 驱油封存作为提高油田采收率的重要手段，可以提高原油采出程度，并同时与地层岩石矿物和流体相互作用，将 CO2 封存在地质构造中，达到减缓温室气体排放的目标[1-7]。（剩余14392字）
