Boring or penetrating the earth – With orienting or racking means for unconnected tools or...
Patent
1984-12-04
1986-08-12
Novosad, Stephen J.
Boring or penetrating the earth
With orienting or racking means for unconnected tools or...
175 52, 166 775, 166 85, 173164, E21B 1916
Patent
active
046050779
ABSTRACT:
Methods and apparatus for facilitating the drilling of a well with a top drive unit having a motor which is connected to the upper end of the drill string and moves upwardly and downwardly therewith. The methods and apparatus of the invention enable the drill string to be pulled upwardly off of the bottom of the well each time an additional length of drill pipe is added to the string, with the connection between that added length and the upper end of the string being made at an elevated location spaced above the rig floor. In one form of the invention, an elevated platform is provided on which a person may move to a location near the raised upper end of the string for assisting in making the connection, with that platform preferably being mounted to swing between a retracted position in which it remains during the drilling operation and an active position in which it projects to a point near the top of the string during the connecting process. In another form of the invention, the back-up tool for preventing rotation of the upper end of the string may be controlled remotely and be removable relative to the string between an active position in which it can grip the elevated upper end of the string and a retracted position in which it remains during drilling.
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Green William P.
Kisliuk Bruce M.
Novosad Stephen J.
Varco International, Inc.
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