Wells – Processes – Cementing – plugging or consolidating
Patent
1977-01-27
1978-04-11
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166123, 166138, 166129, 166140, 166315, 175 65, 175230, 175284, E21B 2300, E21B 33126, E21B 33129, E21C 1700
Patent
active
040834050
ABSTRACT:
The method and apparatus for drilling a well bore and setting a liner therein in which the drill string with a bit and underreamers thereon also includes a liner supported thereon which has a gripping assembly with two sets of gripping elements and a pair of external tapers on the liner each of which coacts with one of the sets of gripping elements, one of which wedges one set of gripping elements into set position responsive to the liner weight and the other of which is spaced from said one a sufficient distance that said one is removed from wedging engagement when said other wedges the other set of gripping elements into set position responsive to upward forces on said liner, and a normally closed bypass around the sealing means on the liner which may be opened responsive to manipulation of the liner to allow cementing of the liner in position within the well bore and the steps of lowering the liner on the drill string as the well bore is being formed, setting the liner, gripping assembly and sealing means, opening the bypass around the liner sealing means and cementing the lever in the well bore.
REFERENCES:
patent: 2641444 (1953-06-01), Moon
patent: 2644523 (1953-07-01), Brown
patent: 2802534 (1957-08-01), Conrad
patent: 2929610 (1960-03-01), Stratton
patent: 3195646 (1965-07-01), Brown
patent: 3314478 (1967-04-01), Burns
patent: 3570599 (1971-03-01), Wilson et al.
patent: 3741304 (1973-06-01), McGill
A-Z International Tool Company
Novosad Stephen J.
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