摘要
在考虑热传导、热对流和热耗散的作用下,对热流体在地层中的不稳定渗流问题进行了分析。建立了一维能量守恒方程,引入地层热力长度的概念,它表示的是考虑地层热损失时,注热的有效利用程度;确立了地层热力影响周期的概念,即地层温度下降幅度为一个对数周期地层受热力影响的长度。引入无量纲对流速度准数、无量纲注入速度准数、无量纲时间准数的概念,这些准数有益于分析地下热力场的分布和变化。数值计算表明,在没有对流影响的情况下,存在一个相对恒定的热力影响周期,即注入热载体的波及范围(或波及长度);而热对流作用的存在,将显著地增大热力波及范围,从而提高热力的利用率。
The unsteady thermal flow is analyzed based on energy conservation equation in which heat exchange, convection and dissipation are considered. Two concepts of formation thermal length and formation thermal effect period are introduced. The former indicates the effectiveness of heat injected; the latter means the heat affected length under one logarithmic-period reduction of formation temperature. Also, three dimensionless parameters are introduced, including convection velocity, injection rate and dimensionless time, which can be used for analyzing the underground thermal distribution and variation. One-dimension numerical calculation shows that there exists a thermal effect period under the condition of no convection; on the other hand, the convection will effectively enhance heat spreading distance and heat effectiveness.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2009年第5期621-623,共3页
Xinjiang Petroleum Geology
关键词
热对流
热采
能量
地层
thermal convection
thermal recovery
energy conservation
formation
