稠油注CO_2的方式及其驱油效果的室内实验

针对地层条件下粘度为 10 0mPa·s的稠油 ,采用室内实验方法研究了稠油注CO2 的注入方式 ,包括CO2吞吐、CO2 吞吐转CO2 驱转水驱、CO2 吞吐转水驱、CO2 驱、水驱CO2 段塞、CO2 水交替注入等 ,并对各种注入方式的驱油效率进行了比较。结果表明 ,在实验条件下 ,CO2 水交替注入和CO2 吞吐转水驱的方式驱油效率最高 ,稠油CO2 吞吐然后转为水驱的方式是可行的。该研究可为现场选择合理的注入方式提供技术参数。

LABORATORY EVALUATION ON DISPLACEMENT EFFICIENCY OF SEVEN SCHEMES OF CO_2 INJECTION IN HEAVY OIL RESERVOIR

Some experiments on seven schemes of CC2 injection are conducted using heavy oil with 100 mPa-s viscosity to evaluate the effect for enhancing oil recovery with CO2 in heavy oil reservoir under reservoir condition. The schemes include GO2 huff-n-puff, CO2 huff-n-puff followed by CO2 and water drive, CO2 huff-n-puff followed by water drive, water alternating CO2 injection (WAG), water drive, CO2 drive, displacement of CO2 slug by water. It is found that WAG and huffn-puff followed by water drive are the two best injection modes for heavy oil reservoir with viscocity of 100 mpa·s. It is conduded that CO2 huff-n-puff followed by water drive is a potential engineering scheme forimproving oil recovery.