卫95块调驱解堵转向注水

卫95块原始储层的层间、平面矛盾导致了注水开发中后期二、三类储层动用状况差,平面波及体积小,调剖、酸化等改善吸水剖面的措施效果逐年变差,目前吸水厚度仅占射孔厚度的41. 7%,层间矛盾加剧。通过有针对性地提出调剖、解堵转向注水工艺,实现了层间、层内、平面的注水方向、强度转向.实施调剖了39井次,酸化24井次的效果为:吸水厚度增加12%,水驱控制程度提高7%,水驱动用程度提高7. 5%,平均注水压力下降1. 5MPa,日注水能力上升。见效增油8 500 t,自然递减减缓1%,采收率提高1%。

ADJUSTING AND DRIVING SOLVE AND STOP UP CHANG ING DIRECTION OF WATER FLOODING IN W95 BLOCK

Those contradictions among layer and level cause two serious phenomenon appeared. The use of two-and-three-rate reservoir bed became bad middle and later periods of water flooding development, involved the volume diminished, and the effect of adjustand drive and solve and stop up became bad year by year. Thickness that absorbed water only occupy thickness of perforation 41. 7%, contradictions among layerwere aggravate at present. So the craft of adjust and drive, solve and stop up,change direction ofwater flooding directlywere presented.It can change direction ofwater flooding among layer and leve.After adjust and cut open 39 wells and acid 24 wells, thickness that absorbed water increased 12%, the degree ofwater drove controlling improved 7%, the degree ofwaterdrives using improved 7. 5%, the average pressure ofwater flooding declined 1. 5MPa,the ability ofwater flooding increased every day. Then the oil increased 8500t, natural decrease slew down 1%, and the petroleum extraction received rate raised 1%.