Research On Re-fracture Reorientation Plugging Gel Of W District,Huabei Oilfield

Fracturing is the major stimulation treatment in low permeable oilfield,it plays a crucialrole in Hua Bei Oilfield.After many years’ exploitation,oil in old crack area almost entirely produced.In order to obtain extra oil,people should do refracturing treatment.Hua Bei Oilfield deep reservoir(2500-3000m)temperature reached 90℃,the mineralization reached 2X104mg/L,the horizontal stress difference,the gel can be anti-temperature and salt resistance is high demands.Through the investigation of the literature and a variety of experimental studies,a new optimization of the polymer gel plugging gel formula,in order to solve the above problems.Based on the properties and characteristics of several kinds of polymer gels.the optimum formula:0.2%AP-P5+ 4%A+0.4%B.Then we discuss the basic properties of the gel plugging agent and main application performance,obtained at a temperature of 90 ℃,salinity of 2×104mg/L,after a long time after the gel strength at F.In addition,by means of ESEM and AFM,the morphological changes were analyzed from the microscopic point of view.The self assembling behavior of the process is judged to explain the macro service performance of the gel system.