Abstract: 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, optimization of aerogel as heat insulation material for insulated tubing, the thermal insulation effect of the insulated tubing is further verified by the measured data. Taking the actual oil well as an example, the governing equations of flow and heat transfer for down hole insulated tubing are established, the heat transfer characteristics of the insulated tubing are numerically simulated, and the influence of different insulation structures on the temperature drop of the oil flow in the pipe is studied. The results show that the four insulation structures meet the production requirements by using 6 mm,10 mm,6 mm+10 mm and 3 mm+10 mm, which provides a theoretical basis for the production of thermal insulation tubing by aerogel nano insulation materials.

Key words: Insulation, Insulated tubing, Aerogel, Numerical simulation

摘要： 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。通过实验分析，优选二氧化硅气凝胶作为隔热油管的绝热材料，并通过实测数据进一步验证隔热油管的保温效果。以实际生产井为例，建立井下隔热油管流动与传热控制方程，分析数值模拟隔热油管的传热特性及不同隔热结构对管内油流温降的影响。研究表明，采用6 mm、10 mm、6 mm+10 mm、3 mm+10 mm四种结构形式，均满足生产要求，为气凝胶纳米绝热材料制作隔热油管提供了理论依据。

关键词: 保温, 隔热油管, 气凝胶, 数值模拟