埕海地区沙河街组凝析油气藏分类与开发对策

THE CLASSIFICATION AND DEVELOPMENT STRATEGY OF SHAHEJIE GROUP OF CONDENSATE RESERVOIR IN CHENGHAI AREA

埕海地区沙河街组发育较多凝析油气藏,通过分类评价,判定该区存在两种带油环凝析气藏类型,在数值模拟的基础上,进行开发程序、开发方式、压力保持水平、气井动用时机论证,提出了适宜的开发对策,建议先采油后采气,储集层不稳定类型采取枯竭式开发,储集层稳定、储量规模较大型量采取油水界面注水开发,初期油环注水注采比应控制在0.7,气油比达到1200~2000时打开气顶区气井开发效果最好。

Condensate reservoir is developed in Shahejie group in Chenghai area.It is judged that there are twokinds of condensate reservoir with oil ring through classification evaluation. The development program, development method, pressure maintaining level and gas well producing time are demonstrated on basis of numerical simulation. The suitable development strategy is proposed. Oil recovery first and then gas recovery are recommended. It is suggested the unstable reservoir take the depletion type, the stable reservoir with larger scale of reservestake the waterflooding on oil-water interface. The injection-production ratio of water and oil in the initial stageshould be controlled in 0.7, gas producing wells in gas cap area would be put into production when the gas oil ratio reaches 1200～2000 with the best effect.