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

发布时间：2018-04-01 10:14

  本文选题：最小混相压力　切入点：超临界二氧化碳　出处：《大连理工大学学报》2017年02期

【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%.
[Abstract]:Carbon dioxide injection has become an important oil recovery enhancement technology in low or ultra-low permeability oil fields worldwide. The ideal displacement pattern in the oil displacement process is to form carbon dioxide miscible flooding. The minimum miscible pressure is one of the key factors in the formation of miscible flooding. Therefore, rapid and accurate prediction of the minimum miscible pressure is an important link in the realization of miscible flooding. The minimum miscible pressure of supercritical carbon dioxide and crude oil system in the test area under reservoir conditions is studied by long pipe displacement experiment method and various empirical formulas. The prediction of force is studied. The error analysis of the results measured by the empirical formula method is carried out with the long tube displacement experiment method. The results show that the minimum miscible pressure predicted by the long tube displacement experiment method is 29.15 MPA and the minimum calculated by each empirical formula method is the minimum. The pressure of miscibility varies greatly. The predicted maximum value is 42.60 MPA, the minimum value is 10.34 MPA, and the average is 26.83 MPA. The relative error of the mean value of the minimum miscible pressure predicted by the empirical formula method is 7.96, among which the least relative error is the PRI 鈪，

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