In order to find a freezing gel foam system with excellent temperature and salt resistance,excellent profiling and water control ability,and controllable freezing time for application in Weizhou high-seepage and high-water-bearing reservoirs,the Waring Blender method,the Sydansk code method,and physical simulations were used to evaluate the evaluation indexes of foaming volume,half-life,freezing strength,resistance coefficient,and flow rate,and a preferred freezing gel foam system was selected:0.2%anionic polymer(KY-6)+0.6%organochromium crosslinker(YG107)+0.6%sodium dodecylbenzene sulfonate(BHSN12)+1%retarder sodium lactate frozen gel foam system.The results showed that the system had excellent temperature and salt resistance;after adding retarder,it could realize controllable freezing(about 15 h freezing,strength of G grade)and long stabilization time;the blocking rate was more than 99%in the range of permeability of the target reservoir,which had good blocking and water control;within the range of permeability gradation difference of 3.2～15.8,it could effectively inject and block the channel of strong water runoff,in which the permeability gradation difference was about 7,and it had the best effect in profile control.
关键词
耐温抗盐/高渗油藏/提高采收率/调剖控水/冻胶泡沫/热稳定性/性能评价
Key words
Temperature and salt resistance/High permeability reservoir/Half-life/Profiling and water control/Frozen gel foam
维普
万方数据