发明授权
- 专利标题: Method for recovering tubular structures from a well and a downhole tool string
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申请号: US15536489申请日: 2015-12-15
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公开(公告)号: US10240420B2公开(公告)日: 2019-03-26
- 发明人: Georges Emile Arnaly
- 申请人: Qinterra Technologies AS
- 申请人地址: NO Stavanger
- 专利权人: Qinterra Technologies AS
- 当前专利权人: Qinterra Technologies AS
- 当前专利权人地址: NO Stavanger
- 代理机构: Gable Gotwals
- 优先权: NO20141536 20141219
- 国际申请: PCT/NO2015/050244 WO 20151215
- 国际公布: WO2016/099282 WO 20160623
- 主分类号: E21B31/00
- IPC分类号: E21B31/00 ; E21B29/00 ; E21B31/16 ; E21B23/01 ; E21B29/02 ; E21B29/08 ; E21B23/00
摘要:
This invention relates to a method for recovering a tubular structure (3) from a well (1), wherein a so-called free point is defined as the location where the tubular structure is stuck in the well. The method comprising providing a downhole tool string comprising a pipe-severing tool and an upper part of the downhole tool string; lowering the downhole tool string into the tubular structure to release the free pipe. Before the step of triggering the pipe-severing tool to sever the tubular structure, the method includes releasing the pipe-severing tool and subsequent withdrawing the upper part, of the downhole tool string away from the free point towards the surface over at least a predefined distance. The invention relates to a downhole tool string for use in such method.
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