一、概况注水开发的老油田,当高含水时,往往是注10多方水,才采出1方油,采油的成本显著增加。如果要提高采收率,就要进行三次采油,如注二氧化碳或化学剂驱油,这就牵涉到经济问题,事关重要的是确定油层中的残余油饱和度值,通过三次采油还能采出若干万方油来,如果经济上合理,往往就进行三次采油。因此精确的测定残余油饱和度,是关系到能否三次采油,也是决定老油田最终采收率的问题。 First, an overview of the old oilfield waterflooding, when the high water content, it is often more than 10 square note water, only to take a side oil, oil production costs increased significantly. If oil recovery is to be enhanced, three recovery operations, such as carbon dioxide injection or chemical displacement, are involved, and it is important to determine the residual oil saturation in the reservoir, which can be recovered by tertiary recovery Out of some Wanfang Oil, if it is economically justified, it often takes three oil recovery. Therefore, the accurate determination of residual oil saturation is related to the possibility of tertiary recovery, which is also the issue of determining the ultimate recovery of the old oilfield.