基于气凝胶绝热材料的隔热油管传热特性研究

Numerical Study on Heat Transfer Characteristics of Downhole Insulated Tubing With Aerogel Insulation Material

采用隔热油管作为生产管柱是提高井口油温、降低集输系统能耗的有效措施。通过调研分析,优选二氧化硅气凝胶作为井下油管绝热材料,建立了井下隔热油管流动与传热控制方程,数值模拟了隔热油管的传热特性,以实际油井为例研究了保温层厚度对管内油流温降的影响。研究结果表明:采用6、10 mm、6+10 mm、3+10 mm,4种保温结构,均满足生产要求,为气凝胶纳米绝热材料制造保温隔热油管提供了理论依据。

Using insulated tubing as production string is an effective measure to raise wellhead oil temperature and to reduce energy consumption of gathering and transportation system.Through investigation and analysis,aerosol was used as heat insulation material for downhole tubing,the governing equation of flow and heat transfer for downhole insulated tubing was established,the heat transfer characteristics of the insulated tubing were numerically simulated.Taking the actual oil well as an example,the influence of the thickness of the insulation layer on the temperature drop of the oil flow in the pipe was studied.The results showed that the 4 insulation structures all met the production requirements,including 6 mm,10 mm,6+10 mm and 3+10 mm,which could provide a theoretical basis for the production of thermal insulation tubing with nanoaerosil insulation materials.