提高蒸汽驱后期开发效果技术对策研究

Technical Countermeasures on Improving Development Effect of Steam Flooding

针对辽河油田杜229块兴隆台油藏实施的20个蒸汽驱井组,部分井组进入蒸汽驱开发后期,出现蒸汽突破现象严重、油层纵向动用不均、平面上受效程度不同导致井组生产效果变差的问题,为进一步提高井组开发效果,利用数值模拟及动态监测手段精细描述蒸汽腔发育形态,开展了剩余油分布规律研究。创新提出四项技术对策改善井组开发效果,一是引入SUBCOOL指导动态调控防止蒸汽突破;二是实施分层汽驱提高油层纵向动用程度;三是实施热水驱提高层内动用程度;四是降低操作压力,提高蒸汽腔平面上的波及体积。通过上述方法的实施,井组综合递减率由18.4%降至2.4%,井组实现持续稳产,油汽比由0.15提高到0.20,提高开发效果,保证了杜229块油藏汽驱开发的经济性。该研究对改善同类油藏蒸汽驱开发效果及经济性提供了技术参考。

Of the 20 steam flooding well groups developed in the Xinglongtai oil reservoir of Du 229 block in Liaohe Oilfield,part of them have entered the later stage of development.Many problems have arisen in the process of development and result in lower production effect.In order to further improve the development effect of the well group,numerical simulation and dynamic monitoring methods are used to finely describe the development form of the steam cavity,and the remaining oil distribution law is studied.This paper puts forward four technical countermeasures to improve the development effect of well groups.First method is to introduce SUBCOOL to guide dynamic control to prevent steam breakthrough;the other is to implement stratified steam flooding to increase the degree of vertical production of oil reservoirs;the third is to implement hot water flooding to increase the degree of production within the formation;the fourth method is to reduce the operating pressure and increase the swept volume on the plane of the steam chamber.Through the implementation of the appeal method,the comprehensive decline rate of the well group is reduced from 18.4% to 2.4%,the well group achieved sustained and stable production,and the oil-steam ratio was increased from 0.15 to 0.20,which improves the development effect and ensures the economics of steam flooding in the Du 229 block reservoir.This research provides a technical reference for improving the development effect and economical efficiencyof steam flooding in similar reservoirs.