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公开(公告)号:WO2015159094A2
公开(公告)日:2015-10-22
申请号:PCT/GB2015/051160
申请日:2015-04-17
Applicant: CHURCHILL DRILLING TOOLS LIMTED
Inventor: CHURCHILL, Andrew Philip
IPC: E21B29/00
CPC classification number: E21B37/00 , E21B17/1078 , E21B23/08 , E21B29/00 , E21B33/138 , E21B41/0078 , E21B43/08 , E21B43/114
Abstract: A method of severing a drill-string comprises reducing the load bearing cross-sectional area of the neck of a connection. The reduction in the area of the neck may be achieved using a precisely located flow-actuated cutter. The cutter may be pumped into the string to land on a seat above the connection. A bypass valve may be provided below the connection to facilitate fluid circulation.
Abstract translation: 切割钻柱的方法包括减小连接颈部的承载横截面面积。 可以使用精确定位的流动致动切割器来实现颈部区域的减小。 切割器可以被泵送到弦中以落在连接上方的座上。 可以在连接下方设置旁通阀以便于流体循环。