摘要
与同心双管注饱和蒸汽不同,同心双管注过热型多元热流体过程中,无接箍油管与环形空间之间的热量交换可引起流体温度迅速变化。在充分考虑同心双管井筒内部热量传递的基础上,利用能量和动量守恒方程,结合海水扰流的井筒外传热模型,建立了海上同心双管注过热型多元热流体井筒传热模型。利用有限差分和迭代方法计算得到了无接箍油管和环形空间内过热型多元热流体的流动典型曲线,现场数据验证表明该模型具有良好的实用性。研究结果表明:该模型适用于不同注汽参数下同心双管井筒中热物性参数的分布预测,并可对海上SAGD及多元热流体吞吐的注汽参数进行优化;无接箍油管与环形空间的较小温差即可导致大量热能流动,引起温度和过热度迅速变化;海水流动对井筒热损失有显著影响;随着非凝结气质量分数增加,井筒内温度和过热度均下降。
Thermal transmission inside a concentric dual-tubing well(CDTW) with superheated multi-components thermal fluid(SMTF) injection causes a rapid change of temperature and degree of superheating in each tube,which is different from saturated steam injection in CDTW.With consideration of the heat transmission between the integral joint tubing(IJT) and the annulis,a mathematical model is established based on mass,energy and momentum conservation equations.Type curves of superheated multi-components thermal fluid flow in the IJT and annulis are obtained by using a finite difference method and an iteration technique.Then,the predicted results from the model are compared with field data.The results show that the model is applicable to predict thermophysical properties of SMTF in CDTW with different injection parameters.Besides,the model is useful to optimize injection parameters during offshore steam-assisted gravity drainage(SAGD) and cyclic steam stimulation(CSS) processes.A small temperature difference between the IJT and annulis will lead to a large amount of heat flow,which causes a rapid change of temperature and degree of superheating in the CDTW.The flow of seawater has a significant influence on the wellbore heat loss rate.Both the temperature and superheating degree decrease with an increasing content of non-condensing gas.
出处
《石油科学通报》
2017年第3期377-389,共13页
Petroleum Science Bulletin
基金
中国海洋石油总公司海洋石油高效开发国家重点实验室第三批开放基金课题"稠油热采流动规律主要影响因素分析"(2015-YXKJ-001)
国家自然基金项目(编号:51490654)
国家科技重大专项(编号:2016ZX05039)
国家科技重大专项(编号:2016ZX05042)联合资助
关键词
海上稠油油藏
同心双管
非凝结气辅助过热蒸汽
热物性参数分布
海水扰流
offshore heavy oil recovery
concentric dual-tubing well
superheated multi-components thermal fluid
thermophysical properties distribution
turbulent flow of seawater
