摘要
热管在采油中的应用,主要应用在井筒中。井筒重力热管是利用热管将油藏自身能量即井底热量传递到井筒上部,在无需外加动力条件下实现对井筒近井口流体加热,改善井口流体温度分布,防止近井口结蜡和絮凝,从而降低采油成本。为了研究井筒重力热管的传热性能和工作过程,进而改进和优化重力热管的传热性能,运用Visual Basic进行模拟计算。基于理论研究,证明热管起到了均衡流体温度场的作用。在此基础上,原油与地层传热系数反应了原油向地层散热的能力,该系数与井口油温基本呈线性关系;原油与热管传热系数对原有温度的降低有一定局限性;对于长径比较大的热管,热流密度不大的情况下,会出现携带极限,可通过计算得到验证。
Heat pipe is mainly used in the wellbore.Gravity assisted heat pipe can heat up fluid near well end applying energy from reservoir,with no additional dynamic,carrying heat from the bottom to top,that balances fluid temperature distribution at well bottom and avoids waxing precipitation and flocculation,so as to reduce the oil recovery cost.To investigate characteristic and process of gravity assisted heat pipe in the wellbore and improve temperature conductivity of heat pipe,Visual Basic programming was implemented for the simulation.Heat pipe can serve for the balancing of the fluid temperature field.Based on the above analysis,it can be concluded that the coefficient of heat transfer between crude petroleum and stratum reflects capability of thermal loss from oil to stratum,and it is a linear relation as a function of oil temperature near the wellhead.There is limitation of the coefficient between crude oil and heat pipe decreasing initial oil temperature,under the condition of large length-diameter ratia and low heat-flow density,there will be a entrainment limit that can be verified by calculation.
出处
《热科学与技术》
CAS
CSCD
北大核心
2012年第1期83-88,共6页
Journal of Thermal Science and Technology
基金
黑龙江省教育厅科学技术研究(面上)资金资助项目(11551006)
关键词
热虹吸管
传热系数
传热损失
VB程序
gravity assisted heat pipe
coefficient of heat transfer
thermal loss
VB programming
