二氧化碳吞吐技术在准东复杂油藏开发中的应用探索

APPLICATION EXPLORATION OF CARBON DIOXIDE HURFF AND PUFF TECHNOLOGY IN COMPLEX RESERVOIRS OF ZHUNDONG LILFIELD

准东吉7井区为深层普通稠油油藏,预测水驱采收率仅为16%左右,亟需探索新的提高采收率技术,而阜东斜坡头屯河组为极强水敏储层。针对准东部分复杂难开发油藏目前存在的问题,开展了二氧化碳吞吐技术的机理研究,以及施工参数的优化研究,通过两口井的二氧化碳吞吐矿场试验,结果表明,二氧化碳对吉7井区原油降粘率达85%以上,而对阜东头屯河组储层不会造成伤害,该试验取得了较好的效果和初步的认识。

Ji 7 well area is the deep heavy oil reservoir,and predicted water flooding recovery is only about 16%,so it is urgent to explore a new technique to enhance oil recovery,and the Toutun River group reservoir of Fudong slope has the strong water sensitivity. Aiming at some problems of complex reservoirs,mechanism of carbon dioxide huff and puff technology has been studied,and operational parameters have been optimized. By carbon dioxide huff and puff test in two wells,the results show that crude oil viscosity reduction rate of Ji 7 well area is above 85%,and the Toutun River group reservoir will not cause damage,which achieved good effect and the preliminary understanding.