CAJ | 학술논문

为描述地下CO2驱渗流机理及混相/非混相驱替特征，选取SF6作为CO2驱气体示踪剂，利用气体示踪响应曲线解释原理，从示踪剂曲线的注入体积、曲线峰值、峰宽、药剂回采率及后续曲线预测等角度，描述CO2在混相/非混相驱状态下的驱替特征。结果表明：CO2在混相/非混相驱状态下示踪剂响应曲线不同，示踪剂见剂峰值浓度对应PV数越小、峰宽越小、回采率越低、预测模型系数越小，则CO2混相驱特征越明显，反之为非混相驱替特征，而非混相特征的出现，将加速CO2与原油的两相分离，降低驱油效率。CO2驱油过程示踪监测对于掌握CO2地下渗流状态，提高驱油效果具有极为重要的矿场指导意义。
위묘술지하CO2구삼류궤리급혼상/비혼상구체특정，선취SF6작위CO2구기체시종제，이용기체시종향응곡선해석원리，종시종제곡선적주입체적、곡선봉치、봉관、약제회채솔급후속곡선예측등각도，묘술CO2재혼상/비혼상구상태하적구체특정。결과표명：CO2재혼상/비혼상구상태하시종제향응곡선불동，시종제견제봉치농도대응PV수월소、봉관월소、회채솔월저、예측모형계수월소，칙CO2혼상구특정월명현，반지위비혼상구체특정，이비혼상특정적출현，장가속CO2여원유적량상분리，강저구유효솔。CO2구유과정시종감측대우장악CO2지하삼류상태，제고구유효과구유겁위중요적광장지도의의。
In order to describe the characters of the miscible and immiscible CO2 flooding,the SF6 is chosen as the gas tracer. According to the principle of tracer response,several parameters like PV,peak value of curve,the width of curve,the recovery rate of tracer and the forecasting of curve were taken into the description of the character of the miscible and immiscible CO2 flooding. The result in this paper illustrated that the curves of the tracer are different between miscible and immiscible driving. The tracer curve of miscible driving shows narrower the hump is,the lower recovery of the tracer,the smaller the forecasting coefficient. On the contrary,in immiscible CO2 flooding,oil and gas will be separated and the recovery rate of oil will decrease sharply. So,the flooding states can be detected by monitoring the gas tracer during CO2 flooding and the findings will improve the recovery rate of oil.