SHI Leiting, ZHU Shijie, ZOU Jian, et al. Study on effective mobility control time ramge and influencing factors of polymer flooding[J]. Petroleum Reservoir Evaluation and Development, 2019, (4): 31-35+46. DOI: 10.13809/j.cnki.cn32-1825/te.2019.04.006.
Study on effective mobility control time ramge and influencing factors of polymer flooding
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.