气藏水平井长度优化设计方法

首先推导了气藏水平井产能公式，在推导过程中考虑了天然气的非达西流动和气层各向异性等因素对水平井产能的影响。其次是建立了气藏内流动模型、水平井井筒内流模型、水平段最优长度数学模型，在建立模型过程中考虑了水平段内摩阻损失和流动状态对水平井产能的影响。所得到的方法对计算气藏水平井产能和设计水平段长度具有指导意义。

A METHOD OF OPTIMIZED DESIGN OF HORIZONTAL WELL LENGTH IN GAS RESERVOIRS

This paper deviates a formulae of horizontal well productivity in gas reservoirs.During the process of the deviation,it considers the effect of non Darcy flow and the anisotrophy of gas layers on the productivity of horizontal wells.Then it constructs the flow model within gas reservoirs,flow model within the well bore of horizontal wells and the mathematical model of the optimized length in the horizontal sector.It also considers the effect of frictional resistance damage and flow state in the horizontal sector on the productivity of horizontal well.The method obtained in this paper has a directive significance for the calculation of horizontal well productivity in gas reservoirs and the designation of the length of horizontal sector.