高含水稠油油藏二次开发水平井生产特征研究

高含水稠油油藏洼38块东二段实施的10口二次开发水平井日产油曲线呈＂左偏正态＂分布特征,水侵强度不同,曲线的偏度和峰值不同,水侵越严重,偏度和峰值越小,水窜井甚至未出现峰值。根据生产特征的差异,将高含水油藏二次开发水平井分为弱水淹、强水淹、水窜三类。渗流机理研究显示,三类水平井开采特征的差异由水淹程度决定,弱水淹区部署的水平井生产效果最好,强水淹区水平井也能获得较好的开发效果,水窜区水平井生产效果差。因此高含水稠油油藏部署二次开发水平井要避开水窜区选择水淹程度较低的区域。

Production Characteristic of Horizontal Wells for Secondary Development in High Water-Cut Stage in Heavy oil Reservoir

There are ten horizontal wells of secondary development in high water-cut stage in Ed2 reservoir of Wa38 block.The production curves of horizontal wells have left-skewed normal characteristics.The skewness and peak value is dependent on the water invasion strength.The greater the water invasion strength,the less the skewness and peak value.Based on the difference of production characteristic,ten horizontal wells can be divided into three kinds：weak water flooding,strong water flooding and water channeling.The difference of production characteristic depend on the water invasion strength.The horizontal wells of weak water flooding are the best,the horizontal wells of strong water flooding are the better,and the horizontal wells of water channeling are the worst.Therefore the horizontal well of secondary development should be deployed in the area of weak water flooding in high water-cut stage in heavy oil reservoir.