Optimization and Performance Evaluation of Frozen Gel Foam System for Weizhou High Permeability Reservoir
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.
Temperature and salt resistanceHigh permeability reservoirHalf-lifeProfiling and water controlFrozen gel foam
万方数据
维普
