Deep pumping in fractured-and-vuggy carbonate reservoirs: Practices in Tahe oil field
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摘要: 深抽作为经济有效的一个常规提液手段，逐步应用于塔河油田缝洞型油藏，并且形成了一套以注水曲线指导深抽的技术政策，但实践过程中发现注水走平井深抽有效率一般。通过对深抽机理重新认识，发现前期忽略了裂缝系统的应力敏感，实际生产过程中裂缝渗透率会随地层压力下降而变差，提出深抽不能一味的去降低液面、放大生产压差，应该合理补充远端地层能量，采取保压开采。Abstract: As a conventional and economic technique, deep pumping has been applied gradually in fractured-and-vuggy carbonate reservoirs in the Tahe oil field, guiding by water injection curves. However, the practice of deep pumping in go-flat injection wells showed a poor efficiency. With a new understanding of deep pumping mechanism, it was found that stress was sensitive in fracture system. Fracture permeability decreased as formation pressure increased during production. As a result, when deep pumping, we should not blindly deepen fluid level and enlarge production pressure difference. Logically supplying formation energy was recommended to take packing mining.
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Key words:
- deep pumping /
- permeability /
- packing mining /
- fractured-and-vuggy reservoir /
- Tahe oil field
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