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1. 发明授权

US5862866A Double walled insulated tubing and method of installing same 失效
标题翻译：双壁绝缘管及其安装方法
公开(公告)号：US5862866A
公开(公告)日：1999-01-26
申请号：US737669
申请日：1996-11-20
申请人： Johann Springer
发明人： Johann Springer
IPC分类号： E21B17/00 , E21B33/047 , E21B36/00 , F16L9/18 , F16L59/06 , E21B19/16 , F16L11/12
CPC分类号： E21B17/00 , E21B36/003 , F16L59/06 , F16L9/18 , F24J2003/088 , F24J3/086 , Y02E10/16
摘要： A double walled insulated tubing string (46) adapted to be hung from a well head (58) has an inner tubing string (21) formed of plural inner tubes and a radially outer tubing string (22) formed of plural outer tubes, the strings being independent of one another apart from axially fixing the strings relative to one another at the top end of the tubing string, although axial fixation may also be provided at the lower end of the tubular strings if desired. An annular insulating gap (30) between the tubing strings (21, 22) is hermetically sealed at both opposing ends and may be evacuated. Inner and outer tubing strings may be run into a well using conventional oil well drilling technology and there is no mechanical connection between the inner and outer tubing strings (21, 22), especially at connections of the respective inner and outer lengths of tube. To maintain the inside of the outer tubing string (22) free from formation liquids before the inner tubing string (21) is run into the well and sealed against the outer string at its lower end, a temporary plug (31) initially closes the lower end of the outer string and is de-activated before liquid can flow through the thermally insulated dual tubing string (46).
摘要翻译： PCT No.PCT / EP95 / 01997 371日期1996年11月20日 102（e）日期1996年11月20日PCT提交1995年5月23日PCT公布。出版物WO95 / 32355 日期：1995年11月30日一种适于从井头（58）悬挂的双壁绝缘管柱（46）具有由多个内管形成的内管柱（21）和由多个内管形成的径向外管柱（22）外管，除了在管柱的顶端处相对于彼此轴向固定柱之外，弦彼此独立，但是如果需要，也可以在管状柱的下端设置轴向固定。在管柱（21,22）之间的环形绝缘间隙（30）在相对的两端被气密密封并且可以被排空。内部和外部管柱可以使用常规的油井钻井技术进入井，并且在内部和外部管柱（21,22）之间没有机械连接，特别是在相应的内部和外部管段的连接处。为了在内管柱（21）进入井内之前保持外管管柱（22）内没有地层液体的内部，并在其下端处密封在外管柱上，临时塞子（31）首先关闭下管并且在液体可以流过隔热双管柱（46）之前被去激活。

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