聚合物驱全过程调剖技术的矿场应用

运用聚合物驱全过程调剖技术可以解决注聚合物过程中聚合物窜流和后续注水快速指进的问题,明显改善聚合物驱的应用效果。河南油田在V油组上层系注聚合物前及I₅+Ⅱ_1-3层系聚合物驱转水驱前进行了区块整体调剖,调剖半径为50～80m,单井调剖剂量为3692～15300m³,调剖井占注聚合物井的75%以上。调剖后启动压力上升,吸水指数下降,吸水剖面得到了改善,与双河油田未进行整体调剖的聚合物驱区块相比,注聚合物2年后,产出的聚合物浓度从170mg/L下降到31mg/L,后续水驱第一年产油量由下降28.4%变为产油量上升。

Field application of profile control throughout polymer flooding

The technique of profile control throughout polymer flooding can prevent the breakthrough of polymer and post- water flooding and improve the drive effects of polymer. The profile control in block -wide was made in Ⅴ Block before polymer flooding and in Ⅰ₅+Ⅱ₁₃ Block before post- water flooding. The radius of profile control ranges from 50 meters to 80 meters, and the amount of profile control agent in a well is in the range 3692 m3 to 15300 m³. The ratio of profile controlled wells to polymer injected wells is over 75%. The field application showed that the injection pressure increased, and the apparent injecting index reduced. The produced polymer concentration was obviously reduced from 170mg/L to 31mg/L after two years of polymer flooding. The natural decline ratio of oil production in other blocks without profile control is 28.4%, but the oil production of blocks with block wide profile control increased in first year of post water flooding.