层内生成CO_2调驱技术在渤海H油田的可行性研究

Feasibility Study of In-stiu Carbon Dioxide Generation in H Oilfield,Bohai Bay

渤海H油田已进入中高含水期。伴随着油田含水率的不断上升,注水井层内层间吸水矛盾日益突出,常规分层调配、调剖效果逐渐变差。为缓解注水矛盾,改善驱替效果,通过室内实验优选注入参数,将层内生成CO_2调驱应用于油田井组现场试验,起到了明显的控水增油效果,调驱有效期内,井组高峰日增油近1.2倍;同时CO_2调驱过程中能够提高注水井视吸水指数。

As H oilfield of Bohai bay has entered medium to high water cut stage at present, and the contradiction between and within the layers become more and more serious with the water cut increase, the effect of conventional incremental measures such as hierarchical adjust and profile control become worse. In order to alleviate water flood- ing problem, and improve the effect of displacement, the in - stiu carbon dioxide generation parameters are opti- mized by lab experiments, and taken into field tests with this technology. There＇s an obvious effect on easing water break through and increasing the oil production. Within the effective period of flooding, the peak production increa- ses 1.2 times than before. And apparent water injectivity index of injection well increase in the process of in - stiu carbon dioxide flooding.