Characteristics of Heat Transfer in Offshore Wellbores with Non-Condensing Gases Flow Coupled with Overheated Steam
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摘要: 为了优化海上稠油油藏"非凝结气与过热蒸汽"（简称为"混合汽/气"）混注过程中的注汽参数，根据质量、能量和动量守恒方程，建立了井筒内非等温流动数学模型，结合海水中传热模型、地层内瞬态导热模型，建立了完整的海上稠油油藏注混合汽/气井筒传热模型，利用有限差分法和迭代法计算得到井筒内的压力和温度分布。研究结果表明：海水流动能明显增加井筒热损失，降低混合汽/气的温度；随着非凝结气含量增加，混合汽/气的温度和过热度均下降；随着注汽压力增加，过热度不断下降。海上稠油油藏注混合汽/气井筒传热模型为优选注汽参数和分析海水对井筒热损失的影响提供了理论依据。Abstract: To optimize injection parameters of non-condensing gas and overheated steam (steam/gas mixture) in offshore heavy oil reservoirs,a mathematical model of non-isothermal flow in wellbore was established following the conservation equations of mass,energy and momentum.Taking into account the heat-transfer model for seawater and transient thermal conductivity model in reservoir formation,an integral heat transfer model in wellbore with steam/gas mixture was established.By using finite difference method and iterative method,pressure and temperature distributions within the wellbore were obtained.Research results show seawater flow results in significant heat losses in the wellbore and reduces temperatures of steam/gas mixture.When the amount of non-condensing gases increases,the temperature and overheat degrees of the mixed steam/gas may decrease.Likewise,with the increase of steam injection pressure,the overheat degrees may decrease.The heat transfer model for wellbores with mixed steam/gas may provide a theoretical basis for optimizing the parameters of steam injection and creating an effective analysis of seawater on heat losses in wellbores.
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