Technology Research On High Temperature Chemical Flooding In Shuanghe Oilfield

According to the enterprise standards of SINOPEC, V11-21of Shuanghe Oilfield is classified III reserves. Reservoir temperature is up to84.3℃. In this paper,aiming at reservoir characteristics, development status and composite drive flooding agent of the V11-21layer in Shuanghe Oilfield,the chemical flooding system is revealed temperature and salt resistance is poor. For the problems exposed, to carry out the screening of the high temperature polymer and the high temperature surfactant is very important. At85℃, under the conditions of oilfield injection water, respectively the polymer of the performance indicators, long-term thermal stability, the bulk and the interface rheology and the performance indicators of the surfactant are evaluated systematically to filter out the good performance of high-temperature resistant polymer ZL-II and the surfactant QY-3.ZL-II and QY-3complex to determine the binary complex oil formulations:1500mg/L ZL-II+3000mg/L QY-3by studying the change factors of surfactant/polymer compound system viscosity and interfacial tension, emulsification properties, long-term thermal stability, degree of hydrolysis.The interfacial tension of the system is8.04×10-4mN/m, the viscosity is more than40MPa·s. Injection experiments show that the binary combination flooding system has a good injection; Flooding experimental results show that the system can improve oil recovery22.81%.