大庆油田萨南东部过渡带注CO_2驱油先导性矿场试验研究

A pilot test and research on oil displacement by injecting CO 2 in eastern Sanan of Daqing oilfield.

１９８８年大庆油田在萨南东部过渡带开辟了注ＣＯ２试验区，１９９０年至１９９５年底先后对葡Ⅰ２油层和萨Ⅱ１０～１４油层进行了非混相ＣＯ２驱油先导性矿场试验。两次试验均采用先进行前期水驱，尔后进行水、气交替注入方式，ＣＯ２气体注入总量各为０．２ＰＶ左右。矿场试验用的ＣＯ２是大庆炼油厂的副产品，纯度为９６％。这两次矿场试验结果表明，降低了水油比和水驱剩余油饱和度，采收率提高６．０％ＯＯＩＰ，每增采１ｔ原油需注入２２００ｍ３ＣＯ２气体。

In 1988, a pilot area for CO 2 injection was selected in the transitional zone of the eastern Sanan of Daqing oilfield. From 1990 to the end of 1995, two pilot tests of non miscible CO 2 flooding were conducted in the Payzone Pu Ⅰ 2 and Payzone Sa Ⅱ 10～14 successfully. In both the tests, water flooding was performed and then water alternating with gas process. The gross quantity of CO 2 injected in both tests was 0.2PV or so respectively. The CO 2 used in the tests is a by product from Daqing oil refining plant, its purity is 96%. The results of both the tests show that both water oil ratio and residual oil saturation have dropped and the recovery efficiency has increased by 6.0% OOIP. 2200m 3 of CO 2 will be needed to 1 ton oil produced.