Active reference system

Details Active reference system Active reference system

1989-04-03

1990-10-16

Novosad, Stephen J.

Boring or penetrating the earth

Boring a submerged formation

166355, 175 27, 175 40, E21B 1909, B63B 3544, B66F 1104

Patent

active

049628178

ABSTRACT:
A motion compensation system is provided for use on a drilling vessel that is subject to heaving due to wave action, and wherein a motion compensator associated with a derrick supports a drill string that extends from the vessel downwardly through the seabed and into a drilled hole in the sub-sea formation, the system including a first encoder for sensing vertical motion of the vessel, due to sea heaving, and for producing an electrical signal that varies in response to such sensing, a device on the vessel for producing hydraulic fluid displacement corresponding to variations of the signal, and an hydraulic fluid responsive manipulator in the form of an actuator or actuators carried by the derrick for lifting and lowering the compensator in correspondence to such hydraulic fluid displacement, thereby to maintain the drill string substantially motionless, vertically.

REFERENCES:
patent: 3158208 (1964-11-01), Kammerer
patent: 3721293 (1973-03-01), Ahlstone et al.
patent: 3793835 (1974-02-01), Larralde
patent: 3912227 (1975-10-01), Meeker et al.
patent: 3940111 (1976-02-01), Castela et al.
patent: 4576517 (1986-03-01), McCann et al.
patent: 4632183 (1986-12-01), McLeod
patent: 4662786 (1987-05-01), Cherbonnier

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