Method and apparatus for pipe joint locator, counter and displac

Details Method and apparatus for pipe joint locator, counter and displac Method and apparatus for pipe joint locator, counter and displac

1976-09-20

1978-08-29

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Displacement

166 65M, 175 48, 731515, G01R 3312

Patent

active

041106881

ABSTRACT:
The invention is a novel method and apparatus for counting pipe joints, passing through a bell nipple, going downhole and uphole by sensing, at spaced apart positions along the nipple utilizing magnetic fields, for the presence of a joint. Each sensor develops signals as the joint passes it and a logical network determines which direction the pipe joint is traveling, adds a plus count to the joint counter for joints going downhole and subtracts a minus count from the joint counter when a joint is sensed coming uphole. Another logical circuit converts the joint count to a stand count, and the negative signals from the stand count trigger an adder network to introduce a binary number to a numeric read-out display, which number is indicative of pipe displacement per stand, withdrawn from hole.

REFERENCES:
patent: 3570594 (1971-03-01), Hamilton
patent: 3646808 (1972-03-01), Leonard
patent: 3777560 (1973-12-01), Guignard
patent: 3944923 (1976-03-01), Lutheran
Richards, R. K., Arithmetic Operations in Digital Computers, New York (1955), pp. 136-144.

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