不同完井方式水平井表皮系数及产能评价新方法  

A new model of skin factor and productivity ratio evaluation for horizontal wells with various completion systems

作　　者：董长银[1] 武龙[1] 王爱萍[1] 张琪[1] 

机构地区：[1]中国石油大学,山东东营257061

出　　处：《特种油气藏》2009年第6期77-81,共5页Special Oil & Gas Reservoirs

基　　金：国家"863"计划资助课题(2006AA09Z351);国家自然科学基金资助课题(50704035)的部分研究内容

摘　　要：为给出带表皮系数水平井基本产能公式的统一形式,将流体由远处地层到井筒内所经区域划分为管外环形带、射孔压实带、射孔孔眼充填带、管内充填带等几个区域,用上述区域的特定组合来表达目前8种主流水平井完井方式所形成的附加渗流阻力区域。根据所假设的物理模型,重新推导了上述各区域层流和紊流压降及表皮系数的计算方法,并给出了水平井不同完井方式下总表皮系数和产能比的计算模型。该模型可用于任何完井方式全部渗流区域的表皮系数分析及产能比预测。通过实例分析了各渗流阻力区表皮系数的相对大小,研究了污染带、射孔参数、充填渗透率等对水平井产能比的影响规律,并提出了提高产能比的方法。This paper addresses the additional flow resistance area formed in 8 leading completion systems of horizontal wells,which is divided into several areas from distant formation to inside wellbore including outside casing annular area,perforation compaction area,perforation hole packing area,and inside casing packing area in order to give a uniform formula of horizontal well productivity with consideration of skin factor.According to an assumed physical model,the calculation method of laminar flow and turbulent flow pressure drop and skin factor for the above areas is evolved and the calculation model for total skin factor and productivity ratio of horizontal wells with various completion styles is developed.This model can be optionally and easily used to analyze the skin factor of all flow areas and the productivity ratio of all well completions.A case study has analyzed the skin factor of each flow resistance area,the impacts of contaminated zone,perforation parameters and packing zone permeability on productivity ratio,and proposed methods of improving productivity ratio.

关 键 词：水平井 砾石充填 完井方式 表皮系数 产能比 压降 产能评价 

分 类 号：TE257[石油与天然气工程—油气井工程]