Procedure and device for determining the jamming point of a pipe

Details Procedure and device for determining the jamming point of a pipe Procedure and device for determining the jamming point of a pipe

1986-04-10

1987-09-22

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 66, 73151, E21B 4700

Patent

active

046949020

ABSTRACT:
The procedure of the invention for determining the jamming point of a pipe line in a drill hole is characterized by applying a constant torsional and/or tensile force to the jammed pipe above ground while a device made according to the invention called a free point probe travels through the pipe at constant speed. The free point probe includes one or two magneto strictive analyzers, which are held by spring pressure against the inner side of the pipe to be examined. During the travel of the free point probe, ideally when pulling it up, the compressive and tensile stresses resulting from the forces acting upon the pipe are read by the analyzer(s) in one area of the inner surface of the pipe and translated into proportional measurement signals. At the same time, the forces acting upon the pipe are measured above ground by means of appropriate receptors. The signals thus obtained are registered and corrected with the help of a data processing system above ground. The results show two independent values of torque and tensile force for a given depth of the pipe, in the form of a log.

REFERENCES:
patent: 2814019 (1957-11-01), Bender
patent: 2817808 (1957-12-01), Gieske
patent: 3115774 (1963-12-01), Kolb
patent: 3453876 (1969-07-01), Radus
patent: 3686943 (1972-08-01), Smith
patent: 4105071 (1978-08-01), Nicolas et al.
patent: 4351186 (1982-09-01), Moulin
patent: 4515010 (1985-05-01), Weido et al.

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