Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Andrew Philip Churchill0
Date of Patent
January 28, 2020
Patent Application Number
15304374
Date Filed
April 17, 2015
Patent Citations
Patent Citations Received
Patent Primary Examiner
Patent 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.
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