Optimization Method Of Rational Polymer Injection Allocation Rate Of Horizontal Well Of Horizontal And Vertical Well Mixed Pattern

In the middle and later periods of the oilfield development, with horizontal well andchemical flooding technology being applied by some oilfields in order to improve thedevelopment effect of the reservoir, the mixed pattern of the horizontal well and the originalvertical wells is formed. The advantages of horizontal well polymer injection are itsincreasing the sand body connectivity direction, reducing the phenomenon of the polymerbreakthrough along the main line, and enhancing oil recovery efficiency and economicbenefits. Therefore, it is significant to study the optimization method of horizontal wellrational polymer injection allocation rate in the horizontal and vertical wells mixed pattern.In this paper, based on the object function of the maximum oil displacement efficiency,used the bottom hole flowing pressure of injection well and production wells as constraintconditions, the mathematical model of the optimization of the horizontal well rationalpolymer injection allocation rate in the mixed pattern with horizontal well polymer injectionand vertical wells oil extraction was established, and the optimization method of horizontalwell rational polymer injection allocation rate in the mixed pattern was put forward. Theprogram of the optimization of horizontal well polymer injection allocation rate wasprogrammed with VB. The rational allocation rate of the H1polymer injection horizontal wellin Sabei A Block of Daqing Oilfield, which was calculated according to the programmentioned above, is coincided well with the oilfield actual data, which shows that theoptimization method of the horizontal well rational polymer injection allocation rate in themixed pattern with horizontal well polymer injection and vertical wells oil extraction iscorrect.