水平井均衡筛管附加压降优化研究

A CALCULATION METHOD OF STAGED ADDITIONAL PRESSURE FOR BALANCED PRODUCTION OF HORIZONTAL WELLS

CF油田油藏油柱高度低、底水能量强、储层非均质性严重,水平井选用均衡筛管技术进行控水。常规的分段附加压降设计仅考虑渗透率极差,对于强底水油藏存在较大误差,不能满足控水要求。从实测地层资料入手,综合考虑水平段渗透率、储层厚度、避水高度等因素差异,推导出水平井均衡产液分段附加压降计算模型,并运用油藏数值模拟方法对其进行验证。在油田生产中,运用本文方法进行水平井均衡产液附加压降设计应用,取得较好的控水效果,有效缓解储层非均质性造成的底水迅速突破。

The CF oilfield are composed of strong bottom water reservoir with low oil column height, due tostrong reservoir heterogeneity, production wells are characterized with rapid water breakthrough. In order to control water breakthrough, the balanced screen completion technology is used. Conventional balanced screen pressure differential design only considered the permeability contrast, resulting in large error. This paper analyzes thegeological data and get main effect factors of water breakthrough, including reservoir thickness, permeability difference and water avoidance height. Based on these factors, establish pressure difference optimization model forbalanced screen water control device. This model helps choose reasonable production pressure difference and inhibit rapid water breakthrough in bottom water reservoir in offshore oilfield.