哈萨克斯坦贝克塔斯气顶边水油藏开发对策与实践

Development Strategy and Practice on a Reservoirs with Gas Cap and Edge Water,Kazakhstan

气顶、边水油藏在开发过程中容易引起气窜造成油井因高气油比而关停,进而影响油田稳产,降低储量的采出程度。研究认为,稳定油气边界是这类油田开发的关键,而解决问题的根本手段在于保持地层压力,阻止气顶的膨胀外扩,因此对油田实施边部注水和气顶屏障注水相结合的开发调整对策。调整实施后油田的开发取得了良好的效果,产气量和气油比显著下降,含水基本保持稳定甚至出现负增长,原油产量稳中有升,各项开发指标均表现出良性开发的特征。通过注水补充地层能量的同时又完善了油田的注采井网,注采井数比和累计注采比逐渐提高,水驱控制程度进一步提高,油田水驱开发取得了较好的效果,为此类油藏的开发提供了借鉴。

In development process it＇ s easy for gas cap and edge water reservoir to attract high oil - gas ratio oil fields shut down caused by gas channeling, and then affect the steady production of oil field and decrease the recovery percentage of reserve. Through research and analysis, the oil - gas boundary is considered as the key of the development of that types of oil fields. And the basic solution method is to keep the formation pressure and prevent the gas cap from expansion outward. According to this situation, development strategy is adjusted to inject water combined wtih edge of oil field and barrier of gas cap which has shown the good effect in implementation. The gas production rate and gas - oil ratio dropped remarkable while the water cut remain stable or negative growth . The crude oil output is rising while maintaining stability and development indexes shown in virtuous feature. This method can replenish formation energy and at the mean time complete the injection - production pattern of oil field through water injection. It can also gradually increase the ratio of injection - production well, the accumulative injection - production ratio and the controlling degree of water flooding. It is a reference example for reservoir development of this type.