摘要
本文采用一个带汇项的流动方程描述了凝析气井在压力大于最大凝析压力时的压力时间变化特征.根据Duhamel叠加原理建立了反映凝析作用的汇项;引入了描述这一汇项的两个新的物理参数:凝析强度R_D和凝析弛豫时间λ_D.由汇项在流动方程中的作用,给出了凝析作用影响井口压力的定量表述,阐明了凝析作用影响井口压力的机理.本文给出了这一流动方程外边界条件为无限大、内边界以定产量生产情况下的解析解.本文的结论可用于试井理论.
This paper utilizes a flow equation with a sink item that describes the charac-terisics of pressure-time chart when the pressure is higher than the maximum condensate pressure. We have established a sink item to show the influence of accumulation of condensate liquid according to Duhamel Principle of Superposition, and introduced two coefficients for it: condensing strength RD and condensing relaxation time λD. This paper gives the principle and the quantitative expression of the well pressure influenced by condensate function in the flow equation. An analytical solution for an infinite system is obtained (constant rate). These results can be used to analyse the unsteady flow test of constant production.
出处
《应用数学和力学》
CSCD
北大核心
1991年第11期973-978,共6页
Applied Mathematics and Mechanics
关键词
气田
压力曲线
汇项
试井
凝析
condensate, sink item, condensing strength, condensing relaxation time, flow test
