Method for determining the free point of a stuck drillstring

Details Method for determining the free point of a stuck drillstring Method for determining the free point of a stuck drillstring

1989-11-13

1990-10-30

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

73151, 175 40, E21B 4700, E21B 3100

Patent

active

049662341

ABSTRACT:
A method for determining the free point of a stuck drillstring is disclosed. The method includes determining the hookload on the stuck drillstring, comparing the hookload on the stuck drillstring with the most recent hookload prior to drillstring sticking to determine the depth of the free point.

REFERENCES:
patent: 3352360 (1967-11-01), Kirby II
patent: 3585857 (1971-06-01), Moore
patent: 3762218 (1973-10-01), Davis
patent: 4207765 (1980-06-01), Kiff
patent: 4515010 (1985-05-01), Weido et al.
patent: 4694902 (1987-09-01), Hormansdorfer
patent: 4708204 (1987-11-01), Stroud

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