关键词: 超井深, 气井, 井筒流动, 温度分布, 压力分布, 数值模拟

Abstract: Ordinary differential equation group,based on mass,momentum and energy conservation,is derived to describe the flow pressure,temperature,gas velocity and density in gas wells and numerically solved with the four order Runge-Kuta method.The numerical model,which accords with the actual situation of the gas wells,allows for the oblique angle,structure of well and tubing string, the radial heat transfer of the wellbore,different heat transfer medium in annular and the change,with the depth,of the physical properties of the formation.The basic data of the Keshen Well No.1(high temperature and high pressure gas well),6460 meters of depth in Xinjiang,are used for case history calculation,and sensitivity analysis is made for the model.The curves of the gas pressure,temperature,velocity and density along the depth of the well are plotted with different production,and it intuitively reflects the gas flowing law and the characteristic of the heat transfer in formation.The result can provide the technical reliance for the process design of well test in high temperature-high pressure gas wells and dynamic analysis (hydrate formation prediction, tubing string design) of production well.

Key words: ultra-deep well, gas well, well-bore flow, temperature distribution, pressure distribution, numerical simulation