Pilot test for gas production of fractured-vuggy condensate gas reservoir by water injection in Tahe oil field
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摘要: 塔河油田X区奥陶系X25井区为碳酸盐岩缝洞型凝析气藏，此类气藏地质特征表现为基质不储集油气，储集体主要为裂缝、孔洞、溶洞。该井区主要是相对封闭的单井缝洞单元，天然水体能量不足，生产动态表现出明显的定容特征，地层能量下降导致气井停喷后由于液面太深无法通过机采手段继续生产。面对此类气藏开发后期无常规手段继续生产的开发困境，技术人员打破思维枷锁，创新提出了在此类气藏进行注水采气的先导性试验，通过向定容体气井注水补充亏空能量，压缩气体体积，使其恢复自喷能力继续生产。此项试验成功探索出了一条提高缝洞型碳酸盐岩凝析气藏天然气采收率的新途径。Abstract: The X25 well block in the Tahe oil field is a condensate gas reservoir with fractured-vuggy carbonates in Ordovician. Its substrate does not reserve oil and gas, and the main reservoirs are cracks, holes and caves. This area is mainly single well units, lacking of natural water energy. Production performance shows significant volume characteristics. With the decline of formation energy, gas wells stop producing by pumping due to deep liquid level. Facing such dilemma, we innovated a pilot test with water injection. Water was injected into gas well to supply energy and compress gas volume, hence made production continued. The success of this experiment explored a new EOR way in such gas reservoirs.
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