储层损害对大斜度定向井产能影响的计算方法研究

STUDY OF FORMATION DAMAGE EFFECT ON THE PRODUCTIVITY FOR DIRECTIONAL WELLS

根据对倾斜井眼周围储层的渗流规律的分析 ,研究了储层损害对完全穿透油层的倾斜井眼产能的影响规律。采用空间坐标变换的方法 ,将渗透率各向异性介质转换为各向同性介质 ,求出了单相流条件下由于井斜产生的拟表皮系数Sθ的关系式 ;通过对倾斜井眼周围储层损害分布区域的分析 ,求出了由于储层损害而产生的真表皮系数Sd的关系式。试算结果表明 :提出的计算方法简便 ,准确率较高 ,可供现场使用。

The productivity equation containing skin factors for directional wells in the infinite reservoir was provided under the condition of the single and stable-state flow. A coordinate transformed method was adopted to calculate the true skin factor S d and the pseudo-skin factor S θ in the directional wells. It has been confirmed that the accuracy of calculated results using the productivity equation is in good agreement with the actual data. It can be applied to the fields for using.