APPARATUS FOR USE IN DRILLING

WIPO Patent Application WO1988008069

A3

Well apparatus including a top drive assembly having a hollow drive stem driven through a gear assembly by a plurality, two or more, of hydraulic motors, the drive stem adapted to be attached to a well swivel at upper end and an intermediate sub or a string at the lower end, the rotary motion of the drive stem to power the string during operations. A shut off valve to shut off well fluid and a link adapter can be located between the lower end of the hollow drive stem and the upper end of the drill string. The vertical axis of the drive stem can be aligned coaxially with the vertical axis of the wellbore and with the vertical axis of the drill string. The top drive can be mounted to a wheeled support frame contained within two elongated members mounted in a derrick. Pivotably mounted to the support frame is a manipulator arm adapted on one end to grasp and support a tubular member and pivotable in a horizontal plane. Also mounted to the support frame is a pipe wrenching device which is extendable toward or retractable from a position coinciding with the well centerline.

JPH02147788	BORING MACHINE
JP3389184	EXCAVATING APPARATUS DRIVING DEVICE FOR GROUND EXCAVATOR
JPH0589589	[Name of device] Excavator

SHAW DANIEL GRADY (US)
CLINE BILLY MAC (US)

PCT/GB1988/000292

November 17, 1988

April 14, 1988

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TRITEN CORP (US)
LUCAS BRIAN RONALD (US)

E21B3/02; E21B19/20; E21B21/10; E21B34/00; (IPC1-7): E21B3/02; E21B19/20; E21B21/10

US3623558A	1971-11-30
GB2091788A	1982-08-04
US4453603A	1984-06-12
GB185465A	1922-09-04
GB2167105A	1986-05-21

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