The Eechnical Investigation On Enhanced Oil Recovery Of Polymer Flooding On The Common Heavy Oil Reservoir

Thermal recovery mining used in heavy oil reservoirs needs to meet some conditions,and polymer flooding was adopted to inhibit the rise of water cut,to extend the production plateau and to increase the economic benefit.This study takes Shuanghe Oilfield member H2 as an example,considering characteristics of Shuanghe nuclear oil Sec,e.g.,small area,few layers,large thickness,active water boundary,low levels of recovery,investigating the heavy oil reservoir polymer flooding experimentally indoors and numerically.Firstly,Shuanghe Oilfield member H2 reservoir and fluid characteristics of the properties of the polymer solution were selected and evaluated,the type of polymer suitable for Shuanghe Oilfield member H2 was screened out,and the concentration of the polymer solution was determined.Secondly,a three-dimensional grid system of Shuanghe oilfield geological model was established and the geological reservoirs fitting and dynamic parameter fitting was conducted,and the distribution of remaining oil in Shuanghe Oilfield member H2 was studied.Then,based on fine reservoir description and remaining oil distribution,the effects of increasing oil in different polymer flooding well spacing were investigated and therefore the reasonable well spacing for polymer flooding was obtained.On the basis of analogy Shuanghe similar reservoir evaluation studies and laboratory experiments,polymer injection parameters,such as injection rate,injection concentration,slug volume and so on,were optimized.Finally,numerical simulation was used to predict the adjustment scheme which was optimized before.And it was found that polymer flooding could gain a degree of enhance oil recovery which was 8.93% higher than water flooding before adjustment and was 7.12% higher than water flooding after adjustment.