液流改向技术在超低渗透油藏应用效果分析

Analysis of effect of application of flow redirection technology to ultra-low permeability reservoirs

针对庄36区块储层裂缝发育、油井见水比例大、见水周期短的开发矛盾,应用PI决策技术,同时与干扰试井、井间示踪剂监测及油水井注采规律等相结合,能够准确判断出油井来水方向,快速确定措施井号,通过强制性改变注入水液流方向,可有效降低油井综合含水,提高水驱储量动用程度。已实施的19口注水井应用效果表明,注水井吸水剖面得到了有效改善,含水上升速度得到有效控制,综合含水下降23.2%,水驱储量采收率提高1.5‰水驱可采储量增加17.9×10^4t。

In view of the development contradictions such as developed fissures in reservoirs of well Zhuang36 area,large proportion oil wells with injected water breakthrough,and the short cycle of water breakthrough,using combination methods of PI decision-making technology with interference test,cross-well tracer monitoring and oil-water wells'production and injection rules, the direction of the coming water to the well can be accurately determined and the well number to be stimulated can be quickly determined too.By forcibly changing the flow direction of the injected water,the comprehensive water cut of the oil well can be effectively reduced,and the producing water-drive reserves ratio can be improved.The application effect of the 19 injection wells that have been implemented shows that the profile-log of injection wells has been effectively improved.The rising rate of water cut is effectively controlled.The comprehensive water cut is reduced by 23.2%,and the water-flood recovery factor is increased by 1.5%.The water-flood reserves have increased by 179000 tons.