油田井下输送原油管道保温结构及性能

Research on Insulation Structure and Performance of Underground Crude Oil Transportation Pipeline in Oilfield

高含蜡原油易在开采及输送过程中出现蜡沉积现象,造成井筒和输送管道的堵塞,影响油田的正常生产。为综合解决油井井筒结蜡和偏磨问题,在分析了目标油藏生产概况以及井筒温度影响因素的基础之上,开展了油田井下输送原油管道保温措施和防磨措施研究,并对保温材料和防磨材料的性能进行了评价。结果表明:油井产液量越大、含水率和动液面高度越高,井筒温度相对就越高,造成井筒析蜡的风险相对就越小。聚苯乙烯泡沫保温材料的综合性能相对更好,当实验时间为360 min时,温度保持率仍能达到85.35%,保温效果较好。NC-2耐磨材料的硬度和耐温性能较好,延展性能优良。采用复合复挤的方式将聚苯乙烯泡沫保温材料和NC-2耐磨材料相结合,形成适合目标油田井下输送原油管道的保温结构,能够满足井筒和输送管道的保温需求,有效缓解井筒结蜡和偏磨问题,有助于提高高含蜡原油的生产效率。

High wax crude oil is prone to wax deposition during extraction and transportation,causing blockages in the wellbore and transportation pipelines,which affects the normal production of the oilfield.In order to comprehensively solve the problems of wax accumulation and eccentric wear in oil well wellbore,based on the analysis of the production overview of the target reservoir and the factors affecting wellbore temperature,research was conducted on insulation and anti-wear measures for underground oil transportation pipeline in the oilfield,and the performance of insulation and anti-wear materials was evaluated.The results showed that the higher the liquid production,water content,and liquid level of the oil well,the higher the wellbore temperature,and the lower the risk of wax precipitation in the wellbore.The comprehensive performance of polystyrene foam thermal insulation material was relatively better.When the experimental time was 360 min,the temperature retention rate could still reach 85.35%.The NC-2 wear-resistant material had good hardness and temperature resistance,and excellent ductility.The polystyrene foam thermal insulation material and NC-2 wear-resistant material were combined by compound extrusion to form a thermal insulation structure suitable for the underground crude oil pipeline in the target oil field,which could meet the thermal insulation needs of the wellbore and transmission pipeline,effectively alleviate the problems of wellbore wax deposition and eccentric wear,and help to improve the production efficiency of high waxy crude oil.