水平井开采技术在老油田高含水期提高采收率中的应用

HORIZONTAL WELL DEVELOPMENT TECHNOLOGY APPLIED TO IMPROVE OIL RECOVERY DURING HIGH-WATER-CUT PERIOD AT MATURE FIELDS

惠州油田群是南海东部地区早期投入开发的油田,边底水发育,地层能量充足。经过二十多年的高速开采,油田步入了高含水开发中后期,剩余油分布日趋分散、复杂;构造、隔夹层及流动单元是剩余油分布的主要地质控制因素。开展剩余油分布规律精细研究是优化水平井设计,提高挖潜效果的关键。为缓解高含水期油田群的产量递减,应用水平井技术进行剩余油挖潜,成功动用了薄油层、"屋脊型"和"工字型"剩余油,提高了高含水期的油田采收率,取得了明显的经济效益。

Huizhou oilfields are the earlier wells put into production at Eastern Nanhai,the edge and bottom water highly produced,with sufficient formation energy. After over twenty years of fast-speed production,the fields have stepped into the mid-later stage of high-water-cut development,the distribution of remaining oil is becoming disperse and complicated. Structures,interlayer and flowing units are its main geological control factors. The precise study on the distribution rules of the remaining oil is a key to optimize the horizontal well planning and improve the stimulation results. To slow down the decline in the oil production at high-water-cut development period,the horizontal well technology has been applied to extract the remaining oil. The thin reservoir oil,the 'attic'and 'by passed'remaining oil have been successfully recovered,and the oil recovery at highwater-cut period is improved,with obvious economic benefits been achieved.