A method of controlling a direction of drilling of the drill string used to form an opening in a subsurface formation

A method of controlling a direction of drilling of the drill string used to form an opening in a subsurface formation, comprises varying a speed of the drill string during rotational drilling such that the drill string is at a first speed during a first portion of the rotational cycle and at a secon...

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Bibliographic Details
Main Authors NORMAN JASON B, SITTON DONALD RAY, GUERRERO JOSE VICTOR, MACDONALD DUNCAN CHARLES, EDBURY DAVID ALSTON, ROGERS JAMES BRYON
Format Patent
LanguageChinese
English
Published 20.03.2013
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A method of controlling a direction of drilling of the drill string used to form an opening in a subsurface formation, comprises varying a speed of the drill string during rotational drilling such that the drill string is at a first speed during a first portion of the rotational cycle and at a second speed during a second portion of the rotational cycle wherein the first speed is higher than the second speed, and wherein operating at the second speed in the second portion of the rotational cycle causes the drill string to change the direction of drilling.
Bibliography:Application Number: CN201210531750