重力热管井筒伴热方式可行性分析.PDF

　　　　　　　　 　2007 8 　　　　　　　　PETRO EUM EXP ORATION AND DEVE OPMENT 　　　　　　　Vol. 34　No. 4 483 :1000-0747(2007)04-048-3 05 张玉丰, 吴晓东, 李伟超 (中国石油大学(北京)石油工程教育部重点实验室) :国家自然科学基金资助项目;中国石油天然气股份有限公司科技风险创新研究项目(06051-1 -2 1) :将重力热管 高效传热特性应用于井筒伴热过程, 并与热流体循环伴热和电加热伴热两种传统方法进行对比, 分析 影响重力热管伴热效果 外部因素。结果表明, 重力热管作为 一种井筒伴热方式是可行 , 空心抽油杆为工质提供工作 环境。通过重力热管 热量存储和传导, 将井筒下部流体多余热能通过自平衡过程传递给近井口管段内 流体, 加热井 筒上部温度较低 原油。与两种传统伴热方式相比, 重力热管在无需补充能量 情况下, 能起到均衡井筒温度场 作用, 同时满足生产 要求。重力热管 伴热效果受到井底流体温度、下入深度、产量以及原油物性 影响:随着井底温度、下 入深度、产量 增加, 重力热管 伴热效果变好;原油物性直接决定重力热管能否在油井应用。 图9 参13 :井 伴热;热流体循环;电加热;重力热管 :TE355.9　　　:A Feasibility of two-phase closed thermosyphon heating method ZHANG Yu-feng, WU Xiao-dong, I We-i chao MOE K ey Laboratory of Petroleum E ng ineer ing, China Un ivers ity of P etro leum, B eij ing 102249, Ch ina ( ) Abstract:Tw-o Phase Closed Thermosyphon (TPCT)is used in the course of w ellbore heating by utilizing its characteristic of efficient hea-t transfer, and several external factors are analyzed by comparing w ith hot fluid circulation method and electric heating method. As a kind of wellbore heating method, TPCT is feasible in oilfields and hollow sucker rods can provide working environment for w ork fluid. Through heat stowing and heat conduction, TPCT can increase the temperature of the upper cryogenic fluid in wellbores by absorbing the surplus energy of the low er, high temperature f luid in the wellbores. Compared with the tw o conventional methods, the TPCT technology improves the tem perature distribution along the w ellbore w ithout extra energy consumed and meets the demand of production at the same time. With the increase of downhole temperature, setting depth and yield, the effect of TPCT improves. Physical properties of oil