水平井井筒和气藏耦合的稳态模型研究

Steady State Model of Horizontal Well Wellbore and Gas Reservoir Coupling

水平井井筒内的流体流动为变质量流动,如何准确描述水平井壁面流入对水平井生产动态的影响是水平井油藏工程的研究热点。建立了单相、稳态的水平井和气藏的耦合模型,推导出了描述天然气在水平井井筒中流动的压降方程,考虑了摩擦压降、加速度压降和壁面流入的影响,该模型具有压力平方形式。利用该模型对某水平气井进行了计算,研究了水平气井的流量和压力分布规律,讨论了井径等因素对水平气井产能的影响。

The flow regime of fluid in the horizontal wellbore is the variable mass flow, how to accurately describe the influence of wellbore surface inflow from the reservoir on the production performance of horizontal wells are the research focus of horizontal well reservoir engineering. In this paper, a single-phase, steady-state, wellbore and gas reservoir coupled model is established and a pressure drop equation describing the gas flow in the horizontal wellbore is derived, which considered the friction pressure drop, acceleration pressure drop and the impact of wellbore surface inflow and has the square form of pressure. Using this model, a certain horizontal gas well＇s production parameter is calculated to study the gas flow rate and pressure distribution along the wellbore, and to discuss the impact of wellbore diameter and other factors on horizontal well deliverability. The model can be a useful tool for horizontal well reservoir engineering studies.