Abstract: A three-dimensional pseudo-pressure distribution model for horizontal gas wells was developed in an unbounded reservoir.The pressure distribution equations in the formation of the herringbone multilateral gas wells were constructed on the basis of pressure superposition and mirror image reflection theory.The equations of gas flow in the multilateral well bore were constructed in consideration of friction loss,acceleration loss,and mixture loss and gravitation effects.A complete model for gas productivity of the herringbone multilateral well was obtained.The effects of physical property of reservoir,pressure loss of well bore and well configuration on gas productivity of the herringbone multilateral well were analyzed with the gas productivity model.The gas productivity laws of the herringbone multilateral well were obtained.

Key words: herringbone multilateral well, horizontal well, gas well, productivity, well bore pressure distribution, computation model

摘要： 推导了水平气井在无界地层中三维拟压力分布模型,运用镜像反映和叠加原理建立了鱼骨型多分支水平气井在地层中的压力分布方程。建立了考虑井筒摩阻损失、加速度损失、混合损失及重力作用的井筒流动方程,从而得到了完整的产能模型。运用产能模型系统分析了储层物性、井筒压力损失、多分支井型结构等因素对鱼骨型多分支水平气井产能的影响,得到了鱼骨型多分支水平气井的产能规律。

关键词: 鱼骨型多分支井, 水平井, 气井, 产能, 井筒压力分布, 计算模型