Well casing grip assurance system

Details Well casing grip assurance system Well casing grip assurance system

1986-12-04

1987-06-30

Novosad, Stephen J.

Wells

Above ground apparatus

Moving tubing or cable into an existing well

166381, 173149, 175162, 254 31, E21B 720

Patent

active

046763120

ABSTRACT:
A casing grip assurance interlock system connected with the elevator and the spider of a well casing installation apparatus including positioning valves respectively actuated by the elevator and the spider to permit actuating fluid pressure to be admitted to either the elevator or the spider only when the other of the elevator or spider is positioned to firmly grip the well casing.

REFERENCES:
patent: 3096075 (1963-07-01), Brown
patent: 3215203 (1965-11-01), Sizer
patent: 3708020 (1973-01-01), Adamson
patent: 3722603 (1973-03-01), Brown
patent: 3999610 (1976-12-01), Sage et al.
patent: 4051988 (1977-10-01), Egerstrom et al.
patent: 4085796 (1978-04-01), Council
patent: 4476936 (1984-10-01), Boyadjieff et al.
patent: 4494376 (1985-01-01), Beaufort
patent: 4595062 (1986-06-01), Boyadjieff et al.

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