关键词: 聚合物驱, 流度控制, 水驱特征曲线, 溶液黏度, 残余阻力系数

Abstract:

The study on the effective control time range of polymer flooding and its influencing factors is conducive to the further development of oil recovery measures after polymer flooding. Based on the theory of characteristic curve of water flooding reservoir and the mobility controlling mechanism of polymer flooding, a judgment method was established, and the influencing factors were analyzed through the indoor flooding experiments. The results showed that there were some differences in the water flooding characteristic curves before and after polymer flooding. With the follow-up process of water flooding, its rule would gradually return to the original rule before polymer flooding. It was feasible to judge the effective mobility control range of polymer flooding by the consistency of the characteristic curve of water flooding before and after polymer flooding. The effect of increasing the viscosity of polymer solution on its mobility control time was relatively small, only 10 ^-2 order of magnitude of PV injection. Increasing the residual resistance factor（RRF） could significantly prolong the effective mobility control time of polymer flooding, and reached 10 ^-1 order of magnitude of PV injection. The residual resistance coefficient of polymer is the main factor affecting the effective mobility control time.

Key words: polymer flooding, mobility control, characteristic curve of water flooding, solution viscosity, residual resistance factor