带底油凝析气藏动态诊断及均衡开采技术

Study on dynamic diagnosis and equilibrium production technology for the gas condensate reservoir with bottom oil

M油田为东海首次投入开发的带底油凝析气藏,该类油气藏具有复杂的驱动能量,其渗流机理、开发技术政策与常规油气藏存在本质区别。针对该类油气藏因气窜、油侵及水侵三元一体交互作用矛盾凸现,导致难以有效开发的难题,进行了增产技术研究,同时形成了三项创新技术:基于生产时变性的变气油比分相产量劈分方法;带底油水驱凝析气藏水驱油效率计算新方法;净驱动能量下动态驱油贡献指数预测技术。这些技术成果可为带气顶油藏或带底油的凝析气藏等同类复杂油气藏的开发提供重要的借鉴及技术支撑。

M Oilfield is the first gas cap reservoir in the East China Sea,which has complex driving energy.Its seepage mechanism and development technology policy are essentially different from conventional reservoirs.Aiming at the difficult problem of effective development of this kind of reservoir due to the contradiction of gas channeling,oil invasion and water invasion,the technology of stimulation measures is studied.At the same time,three innovative technologies have been formed:splitting method of variable gas oil ratio phase production based on production time variability;a new method for calculating water displacement efficiency of water drive gas condensate reservoir with bottom oil;prediction technology of dynamic oil displacement contribution index under net driving energy.These technical achievements can provide important reference and technical support for the development of similar complex reservoirs such as gas capped reservoirs or condensate gas reservoirs with oil rings.