Method and system for drill stem breakout during drilling...

Details Method and system for drill stem breakout during drilling... Method and system for drill stem breakout during drilling...

E - Fixed Constructions

21

B

255/14.7

E21B 19/16 (2006.01) E21B 21/01 (2006.01) E21B 21/08 (2006.01)

Patent

CA 1240982

PROCESS AND APPARATUS FOR DRILL STEM BREAKOUT DURING DRILLING OPERATION ABSTRACT A rotary well drilling system employs a drill string with a drill bit affixed at its lower end for the drilling of a borehole. Drilling fluid is circulated through the drill string to remove drill cuttings. To break out a section of drill pipe from the drill string, the drill string is raised to a point where the drill string joint to be broken is above the drilling rig floor. Compressed gas is injected into the drill string to displace the column of drilling fluid to a level below such drill string joint. The compressed gas is vented and the drill pipe is broken out of the drill string.

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