Water injection technique for fractured-vuggy condensate gas reservoirs in Tahe oil field
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摘要: 塔河油田D区奥陶系凝析气藏是其主力气藏。其D2井区近年来产量递减迅速，如何提高该类气藏的采收率是区块持续高效开发亟待解决的难题。根据气藏储集体特征及开采特性，分析了注水保压机理、选井依据、先期注水与后期注水的适用范围及最佳时机，利用物质平衡法分析注水量与压力恢复、储量动用的关系以确定合理注水量，提出了较完整的注水保压技术，通过现场实践表明注水保压可有效提高碳酸盐岩缝洞型凝析气藏天然气采收率。Abstract: The Ordovician gas condensate reservoir in D area of Tahe is a main gas reservoir in the Tahe oil field. The gas production in D2 well area has been decreasing rapidly in recent years. How to improve the recovery rate of such gas reservoir is a difficult problem to be solved in the continuous and efficient development of block. According to reservoir and production characteristics, we analyzed water injection mechanism, provided a base of selecting water injection well, identified the best time and application scope of water injection, used a material balance method to study the relationship between water injection and pressure recovery and recoverable reserves, determined a reasonable water injection amount, and finally provided a complete technique for water injection in gas well. Field practice showed that water injection could effectively improve the fractured-vuggy carbonate condensate gas recovery.
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Key words:
- carbonate rock /
- condensate gas reservoir /
- water injection for gas production /
- EOR
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