Apparatus for constantly rotating casing during installation

Tool driving or impacting – Advance causing or controlling means – Driven flexible member causes advance

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Details

173164, 175 57, 175 61, 175 85, E21B 1916, E21C 1900

Patent

active

041355865

ABSTRACT:
An inclined drill rig is disclosed with attached rotatable power tongs for use in practicing a process for the installation of underground casing. The underground casing is usually installed coaxially to a pilot string disposed about an invert arcuate underground path underneath an obstacle, such as a river. The underground casing is installed in discrete segments from a slanted drill rig unit including a car traveling on an inclined ramp. The traveling car on the inclined drill rig ramp crowds and rotates each pipe segment sequentially into the ground from a rotating table. When the last pipe segment attached is fully advanced into the ground, it is clamped at power tongs located at the front of the ramp. These power tongs apply torque to rotate all the casing in the ground without crowding the casing.

REFERENCES:
patent: 3399735 (1968-09-01), Ikeda
patent: 3662611 (1972-05-01), Knoll
patent: 3708020 (1973-01-01), Adamson
patent: 3878903 (1975-04-01), Cherrington
patent: 3892140 (1975-07-01), Fox et al.
patent: 3919902 (1975-11-01), Johnson
patent: 4003440 (1977-01-01), Cherrington

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