高质量浓度聚合物注入时机对驱油效果的影响

Effects of timing of high-concentration polymer flooding on oil displacement efficiency

为了进一步增加油田的可采储量,研究了普通聚合物驱的不同时期转注高质量浓度聚合物溶液的驱油效果.结果表明:高质量浓度聚合物驱转注时机越早或聚合物溶液的质量浓度越高,都能使原油采收率比水驱提高到或超过20%;增加原油采收率的幅度与表面活性剂/聚合物/碱驱的相当,但其费用比表面活性剂/聚合物/碱驱的低.

The Visco-elastic property of partially hydrolyzed polyacrylamide(HPAM) fluid increases not only the volumetric sweep efficiency but also the displacement efficiency of the pay zone on a micro scale.The purpose is to further enhance the oil recovery by high concentration polymer flooding.The results on artificial cores with a Dykstra-Parson Coefficient of 0.72 show that an incremental recovery over water flooding of more than 20% OOIP can be obtained by early injection of the high concentration polymer solution,the earlier the better.The incremental recovery is comparable to alkali/surfactant /polymer flooding but at a lower cost.