Position determining and dynamic positioning method and system f

Details Position determining and dynamic positioning method and system f Position determining and dynamic positioning method and system f

1978-05-09

1980-05-27

Ruggiero, Joseph F.

Boots, shoes, and leggings

114144B, 364449, G06F 1520, B63H 1500

Patent

active

042053790

ABSTRACT:
The relative horizontal positions of a floating marine platform and the lower end of a flexible connecting line, such as a cable, drill string, or well bore riser, suspended from the platform are determined by generating angle signals representing the instantaneous vertical slope angles of the connecting line at or near its upper and lower ends, filtering these signals to remove higher order frequencies resulting from variable forcing functions, such as surface wave induced motion of the platform, which produce no net change in the platform position, whereby the filtered angle signals represent the mean terminal slope angles of the envelope of the undulating connecting line, and combining these filtered angle signals in accordance with a predetermined position equation which compensates for phase lag between the sensor measured and true positions of the platform due to the transit time of platform motion induced stress waves or undulations along the connecting line to the lower angle sensor. The invention is described in the context of positioning a floating oil well drilling or producing platform relative to an ocean floor well head.

REFERENCES:
patent: 3148653 (1964-09-01), Shatto, Jr. et al.
patent: 3422783 (1969-01-01), Moulin
patent: 3880105 (1975-04-01), Bryant
patent: 3953827 (1976-04-01), Le Moal et al.
patent: 4044473 (1977-08-01), Crask

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