Method for regaining mud circulation in operating well and...

E - Fixed Constructions – 21 – B

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E21B 37/00 (2006.01) E21B 21/00 (2006.01) E21B 33/068 (2006.01) E21B 37/04 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2104695

Run into a well, e.g. in a tubing (1), on a pipe string (2) is a hydromechanical cleaner (3). A bridge (4) is washed out by direct descending flow of drilling mud pumped through the pipe string (2). The cleaner (3) is moved downward as the bridge (4) is washed out by moving the pipe string (2). The ascending flow of drilling mud rotates the cleaning heads (5 and 6) in opposite directions. Cutting knives (7) of the cleaning heads (5 and 6) mechanically remove deposits from walls of the tubing (1). The deposits from the walls are removed mechanically during running the cleaner (3) into the well and curing its lifting from the well. Products of the washed out bridge (4) and deposits are removed from the well by ascending flow through a side branch pipe (41) of a wellhead circulating head (18). The device for use in the method includes also a mechanism for moving the pipe string (2) and a pump unit.

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