Wells – Valves – closures or changeable restrictors
Patent
1978-11-17
1980-06-24
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
166 775, 173147, 175171, B25B 1350, E21B 1906
Patent
active
042090660
ABSTRACT:
This invention is used in conjunction with a small drilling rig having a traveling head. The apparatus enables the rig to accommodate much longer joints of casing than is otherwise possible, and avoids damage to the threads at the box and pin end of the joint. An upper and lower elevator is provided, along with an adaptor apparatus by which one of the elevators can be attached to the traveling head of the rig. In going into the hole, one elevator is attached to the upper end of a joint, the adaptor apparatus is attached to and lifted by the traveling head, and lowered until the elevator engages the rig floor. Thereafter the head is removed from the elevator so that the elevator supports the box end of the joint at the rig floor. The other elevator is of similar construction and is attached to the upper end of another joint. The head lifts the joint into the derrick so that the pin end thereof can be mated to the box end of the first joint, thereby providing a string located within the borehole. The lower elevator is attached to rig structure, while the upper elevator is rotated by the head, thereby making up the threads. The lower elevator is removed from the string and placed on still another joint, while the head lowers the string into the hole. This operation is continued until the entire string has been made up. The string is removed from the borehole and broken out in the reverse manner.
REFERENCES:
patent: 2781185 (1957-02-01), Robbins
patent: 3239016 (1966-03-01), Alexander
patent: 3280920 (1966-10-01), Scott
patent: 3299957 (1967-01-01), O'Neill et al.
patent: 3404741 (1968-10-01), Gheorghe et al.
patent: 3680412 (1972-08-01), Mayer et al.
patent: 3949818 (1976-04-01), Russell
Bates Marcus L.
Novosad Stephen J.
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