埕海沙河街组高收缩原油特征及开发对策

Characteristics and Development Measures of High Shrinkage Oil in Shahejie Formation,Chenghai Oilfield

为了高效开发埕海地区沙河街组油气藏,以化验、测井、测试、试采资料为基础,分析油藏相态特征,开展高收缩原油的开发方式、井距、井型、注采井网等论证,采取同步注水而非后期注水,选择300 m井距、600 m水平段长度、北东向注采井排,可以有效提高油藏开发效益;在不同井网优化论证基础上,优选水平井采油,定向井同期注水适合油藏的特点,开发指标预测较优;经实施该区新井初期产量超过了方案设计,区块开发取得了较好的效果。

For high efficient development of hydrocarbon reservoir in Shahejie formation of Chenghai oilfield, based on laboratory test, well logging, well testing and production test data, the phase behavior characteristic of crude is analyzed, and then the development mode, well spacing, well type, injection-production well pattern of the high shrinkage oil reservoir is demonstrated. It is adopted that the reservoir development efficiency is higher by 300 m well spacing, 600 m horizontal section and north-east injection- production well array through early synchronous water flooding rather than by later stage water flooding. Based on the optimization of different well pattern, the horizontal well for production and directional well for water flooding is suitable for reservoir charac-teristics, and the development index is better than prediction. After implementation, the initial production of new well in this oilfield exceeded the program design, and the oilfield development results are very good.