萨南油田二区东块高台子油层注采系统调整

Flooding system adjustment on GTZ reservior in the east of South II area

萨南油田二区东块高台子油层随着开采程度的加深 ,含水上升速度加快 ,产量递减 ,对于反九点面积井网 ,平面矛盾突出 ,产液结构调整困难大 .采用数值模拟方法 ,选择了隔排转注高含水边井的线性注水方案 .模拟计算表明 :注采系统调整后产量明显提高 ,最终采收率可提高 1.6 3 % .现场试验表明 :注采系统调整后地层压力回升 ;多方向砂岩水驱控制程度提高 5 5 .6 8% ,有效厚度水驱控制程度提高 5 5 .81% ;低含水油层砂岩动用厚度比例提高 7.71% ,有效厚度动用比例提高 9.0 2 % ;含水上升速度得到有效控制 ,综合含水率由调整前的 76 .5 4%稳定到调整后的 76 .5 0 % .

As the production degree on GTZ reservior in the east of South II area is intensified, the water-cut increasing rate is becoming faster, the production is decreasing, the plane contradiction is becoming more outerstanding and the liquid structrue adjustment is becoming more difficuit under the condition of inverted 9-spot pattern. A linear injection project is selected to turn the end holes with high water-cut into injection wells in alternate line by using numerical simulation. The simulation calculations show the production increasing distinctively after flooding system adjustment, and the ultimate recovery increasing 1.63%. The field trial demonstrates: the formation pressure picking up, the sand-stone thickness which is multi-direction flooded increased by 55.68%, the effective pay thickness increased by 55.81%, the ratio of producing sand thickness in low water-cut reservoir by 7.71%, the ratio of producing effective thickness by 9.02%, the rate of water-cut increasing has been controled effectively, the composite water-cut has been stablized from 76.54% to 76.50% after such adjustment.