Method and apparatus for oscillating a drill string

The present invention provides a method for oscillating drillstring (135). The method comprises the following steps: (a) rotating the drillstring (135) in a first direction until arriving at a first limit; and (b) rotating the drillstring (135) in a second direction until arriving at a second limit....

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	CARDELLINI DAVID ALLAN, HULICK KENT ERIN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	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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