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目前油田采油井筒伴热管热力计算与分析都是以同心管柱环空为基础,但油田井筒套管柱安装时会产生偏移,与同心环空条件下相比,对流换热系数计算误差较大。本文针对不同偏心状态,结合井筒伴热的方式和原理,利用实验方法探究偏心环空对对流换热系数的影响。结果表明:在实验室条件下,冷热流体流量对换热系数影响显著;在开式循环中,受混合热影响,偏移影响不显著;在闭式循环中异向偏移大于同向偏移;换热系数随同向偏移距离先增大后显著减小;对流换热系数随偏移角度先增大后降低,且随着偏移距离增大,换热系数变大。
At present, the thermal calculation and analysis of oil well tubular heat pipe in oilfield are based on the concentric column annulus, but the offset of the wellbore casing string in the oilfield is offset when compared with that under concentric annulus. The error in the calculation of convection heat transfer coefficient Big. In this paper, different eccentric conditions, combined with wellbore heating mode and principle, the use of experimental methods to explore the eccentric annulus on the convection heat transfer coefficient. The results show that under the laboratory conditions, the flow rate of the hot and cold fluids has a significant effect on the heat transfer coefficient. In the open cycle, the offset effect is insignificant due to the influence of the mixed heat. In the closed cycle, the out-of- The heat transfer coefficient increases first and then decreases significantly with the same direction offset. The convection heat transfer coefficient first increases and then decreases with the offset angle. As the offset distance increases, the heat transfer coefficient becomes larger.