Performance Evaluation of Profile Control System for Strong Water Breakthrough Reservoirs
In order to solve the problem that the surface of sandstone particles in Suizhong 36-1 oilfield is strongly hydrophilic and negative under the action of long-term high-intensity water flooding,positively charged cationic crosslinking agent is used to firmly adsorb the surface of sandstone reservoir through the attraction between opposite charges on the one hand;on the other hand,it can physically and chemically react with negatively charged polymer to form a three-dimensional network crosslinking system to block the hyperpermeability layer to increase the injection pressure gradient to improve polymer flooding development.In this paper,the potential and particle size,gluing performance,long-term stability and plugging property of profile control system in strong water channeling reservoir were investigated.The results showed that the potential change of profile control system in strong water channeling reservoir was positive due to the cross-linking of cations and ions.The profile control system of strong water channeling reservoir was curled into glue due to ion crosslinking,and the particle size was small.With the increase of the mass concentration of crosslinker and polymer,the formation time of the system became shorter.In simulated formation water,the viscosity retention rates of medium and high strength gel were above 85%at 50℃,65℃and 80℃when the gel was placed for 90 d.Compared with the conventional gel system,the injection pressure of the profile control system with the same mass concentration of strong water channeling reservoir had little difference,and the subsequent water drive pressure was higher.In the subsequent water drive process,the residual resistance coefficient of the profile control system of strong water channeling reservoir was larger.The plugging rate of the profile control system of the strong water channeling reservoir was relatively high,which basically kept above 85%,and the plugging property was good.
Suizhong 36-1 oilfieldStrong water channelingProfile controlPlugging property
万方数据
维普
