Well drilling apparatus

Details Well drilling apparatus Well drilling apparatus

1979-07-13

1982-09-28

Schroeder, Werner H.

Tool driving or impacting

Impacting devices

With means for rotating tool

173165, 175 85, 175195, E21B 304, E21B 1500

Patent

active

043513980

ABSTRACT:
A drill rig for drilling wells having a derrick adapted to hold and lower a conductor string and drill pipe string. A support frame is fixed to the derrick to extend over the well to be drilled, and a rotary table, for holding and rotating drill pipe strings, is movably mounted thereon. The table is displaceable between an active position in alignment with the axis of the well and an inactive position laterally spaced therefrom. A drill pipe holder is movably mounted on the frame below the rotary table for displacement between a first position laterally of the axis of the well and a second position in alignment with the axis of the well. The rotary table and said drill pipe holder are displaced in opposition to each other, so that the rotary table may be removed from alignment with the axis of the well and said drill pipe string simultaneously held without removal from said well.

REFERENCES:
patent: 2981346 (1961-04-01), Bauer et al.
patent: 3593808 (1971-07-01), Nelson
patent: 3695363 (1972-10-01), Kelly, Jr.
patent: 3981369 (1976-09-01), Bokenkamp
patent: 4081163 (1978-03-01), Guinn et al.

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