西西伯利亚北部气田真空绝热管VIT应用的经验

Alexander Belomestnov, K. Marchenko, I. Melnikov
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摘要

真空绝热管性能评价统计、有限元分析、计算流体力学(CFD)真空绝热管的应用是地球北方地区油气开发和热采油技术应用的必然要求。从概念上讲,VIT由两端同轴固定的两根(外部和内部)管道组成,环形空间填充隔热材料,包括吸热器(气体吸收器)。管道组装好后,空气从环形空间中抽走,形成真空。吸尘机完全激活。在俄罗斯天然气工业股份公司进行商业应用之前,VIT在俄罗斯天然气工业股份公司VNIIGAZ研究所(俄罗斯)的专用热物理测试台上进行了测试。设计了测试VIT真空屏蔽绝热材料导热系数(k因子)的方法。试验结果表明:当热空气(84 ~ 93℃)通过管道时,管道外表面温度保持在28 ~ 35℃范围内,K因子为0.004 ~ 0.008 W/(m*K)。俄罗斯天然气工业股份公司要求最大的k因子。0.012 W / (m * K)。当VIT成功通过台架测试时,它们被批准用于俄罗斯天然气工业股份公司运营的Bovanenkovskoye油田的商业开发。为了测量不同气体流速和流体温度下VIT管壁的热流密度和有效k系数,设计将卫星管安装在气井的水泥柱内。目前,井口土壤温度观测是在配备viti的井中定期进行的。一些气井已经监测了3年。对18个井台(163口井)的监测结果显示,永久冻土土壤的温度稳定仅通过季节性主动冷却系统(不使用VIT)进行,沿井筒的土壤温度升高。使用VIT和冷却系统的井在整个年周期内保持水泥柱内的冰冻温度。对于注汽技术,可以根据VIT k系数和VIT管柱长度,从理论上估计蒸汽温度自上而下的下降情况。这些信息是VIT井设计所需要的。关于VIT利用的经验信息
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experience with the Vacuum Insulated Tubing VIT Utilization at Gas Fields in the Northern Part of Western Siberia
Evaluating of VIT performance Statistics, Finite Element Analysis (FEA), Computational Fluid Dynamics (CFD) The utilization of Vacuum Insulated Tubing (VIT) is necessitated by the growing oil and gas development in northern regions of the Earth and application of thermal oil recovery methods. Conceptually, VIT consists of two (external and internal) pipes coaxially fixed at the ends, with the annular space filled with thermal insulation including getters (gas absorbers). After the pipes are assembled, air is evacuated from the annular space to create vacuum. Getters are fully activating within vacuumizing. Prior to commercial utilization at Gazprom, the VIT was tested at the Gazprom VNIIGAZ Institute (Russia) on a dedicated thermophysical testing bench. Tests were designed to measure the Coefficient of thermal conductivity (k-factor) of the VIT Vacuum Shield Thermal Insulation. Results obtained during the tests are as follows: with hot air (84…93°C) passing through the tube, the temperature of its external surface remained within the range of 28…35°C, while k-factor was 0.004…0.008 W/(m*K). Gazprom requirements k-factor with max. 0.012 W/(m*K). When VIT successfully passed bench tests, they were approved for utilization in the commercial development of the Bovanenkovskoye field operated by Gazprom. In order to gauge heat flux and effective k-factor of VIT walls at different gas flow rates and fluid temperatures, the design provides for satellite pipes to be installed within the gas well's cement column. At the moment, wellhead soil temperature observations are carried out regularly at VIT-equipped wells. Some gas wells have been monitored for 3 years now. The results of monitoring of 18 well pads (163 wells) the temperature stabilization of the permafrost soil at which is carried out only through the operation of seasonally active cooling systems (without the use of VIT) show temperature increases in the soil along the wellbore. Wells operated with VIT and cooling systems keep freezing temperatures within the cement column throughout the entire annual cycle. For steam injection technologies, may be used theoretically estimation about how temperature of steam decreases from top to bottom of well depending on VIT k-factor and length of VIT string. Such information needs for VIT well design. Empirical information about VIT utilization
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