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正确预测水平井产能对水平井开发方案设计、生产优化及生产动态分析具有重要意义。在充分考虑水平井生产特性的基础上，将水平井看成是由若干段线汇组成，把气体在气藏内向水平井的三维稳态渗流与其在水平井筒内的流动耦合起来，建立了气藏水平井稳态产能计算模型，并提出了求解此模型的方法。实例计算表明：水平井筒内的压力损失对其产能有影响，地层渗透率高时，影响更大；水平井每单位长度的生产指数沿水平井段并非处处都相等。该模型稍作改动，就可用于油藏水平井产能预测。

A NEW MODEL OF CALCULATING STEADY STATE PRODUCTIVITY OF THE HORIZONTAL WELL IN GAS RESERVOIR

It is significant for the development program design,production optimization and performance analysis of a horizontal well to correctly forecast its productivity.Based on fully considering the production property of the horizontal well,on the assumption that the horizontal well is regarded as being composed of a certain number of segment line aggregates,and through coupling the 3D steady state flow of the gas from the reservoir toward the horizontal well with its flow within the horizontal wellbore,a model of calculating steady state productivity of the horizontal well in gas reservoir is set up and a method for solving the model is proposed.By calculating an example it is shown that the pressure drop within the horizontal wellbore has influence on the productivity of the horizontal well;that the higher the formation permeability,the larger the influence;and that the production index per unit length along the horizontal wellbore is not the same from place to place.When slightly modified,the model can be used to forecast the productivity of the horizontal well in oil reservoir.