大气顶薄油环底水油藏开发方式

Development of reservoir with big condensate gas cap and oil rim

 冯晓楠 2 陈志海² 姜凤光² 陈诗雯³

中国石油大学（北京）石油工程教育部重点实验室，北京 102249 中国石化石油勘探开发研究院，北京 100083 中国石油勘探开发研究院，北京 100083）

 针对大凝析气顶、薄油环、厚底水，同时高含CO2油藏的特殊性和开发难点，以海上K油田为例，运用油藏工程和数值模拟方法，分别对凝析气顶和重质油环衰竭式和保持压力条件下的开发对策进行了系统研究。结果表明：与利用天然能量开发相比，注气保持压力开发能够提高油藏总体采收率20百分点以上，同时使气顶中凝析油的析出量减少一半左右；利用直井开发气顶、水平井开发油环、注气井循环注气能使油藏总体采收率达到32%，实现气顶和油环的协同高效开发，同时减缓了生产对油气和油水界面变形的影响。研究结论为国内外类似油藏的高效开发提供了理论依据和技术参考。

 For reservoir with thin oil rim, big condensate gas cap on top, aquifer below, and extremely high CO2 content, it is a complicated project to develop it. Taking the deep water K Oilfield as an example, condensate gas cap and heavy oil rim development was studied under the depletion and pressure maintenance conditions by reservoir engineering and numerical simulation. The results show that, comparing with the depleted development, oil recovery factor is enhanced more than 20% through gas injection. Meanwhile, amount of oil which condensed in gas cap during the production is also reduced by half. Simultaneous and efficient development of hydrocarbon can be achieved using vertical wells to develop gas cap and horizontal wells for thin oil rim with a high oil recovery factor of 32%, which will also result in delayed water coning and slower gas channeling. The research offers important reference to similar reservoirs.

10.6056/dkyqt201603016