Deep pumping applied in water injection failed wells in fractured and vuggy reservoirs in the Tahe Oil Field
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摘要: 塔河油田奥陶系油藏为典型的缝洞型碳酸盐岩油藏,受多期构造作用、岩溶作用和成岩作用的叠加改造,形成了由孔、洞、缝组成的储集空间和渗透通道。随着注水开发的深入,注水失效井逐步增多,部分井采出程度低于10%,动用率偏低。结合注水替油失效井注水期间压力变化情况、注水规模、周期注水量等数据进行分析总结,确定注水失效井储集体类型、规模,指导注水井深抽工作。并对现场应用效果进行跟踪评价,取得了较好的增油效果。Abstract: The Ordovician reservoirs in the Tahe Oil Field are typical fractured and vuggy carbonate reservoirs. The superimposition of tectonic settings, karstification and diagenetic effects formed pores, caves and fractures, which served as storage spaces and migration pathways for hydrocarbons. With the deepening of water injection development, water injection failure gradually increases, and some wells have recovery rates lower than 10%. The pressure changes, injection scale and cyclic injection amount of water injection were studied to determine the reservoir type and scale for failed wells. This method has been applied in field works, and proved effective.
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Key words:
- fractured and vuggy reservoir /
- water injection failure /
- deep pump /
- Ordovician /
- Tahe Oil Field
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