A system for reducing the effects of heave movements of a wellhead in an offshore drilling device is provided that includes a frame; a coiled tubing stack supported by the frame; and a heave compensation system for controlling an amount of load transferred from the coiled tubing stack to the wellhead to reduce relative movements between the coiled tubing stack and the wellhead.
This patent application claims priority under 35 U.S.C. .sctn. 119(e) to provisional application Ser. No. 60/457,219 filed on Mar. 25, 2003 which is incorporated herein by reference.
An offshore oil well assembly is provided that includes a floating vessel and a coiled tubing injector supported on the floating vessel. A coiled tubing string is movable by the injector into and out of a wellbore. The assembly also includes at least one measurement device which, either directly or indirectly, measures a heave induced acceleration of the injector; and a control system which receives a signal from the measurement device indicating the heave induced acceleration of the injector, and transmits a command signal which causes a counteracting acceleration to be applied to the coiled tubing, wherein the counteracting acceleration is opposite to the heave induced acceleration experienced by the injector.
An offshore oil well platform assembly is provided that includes a jacking frame, which supports a coiled tubing injector, which in turn is connected to a wellhead during a coiled tubing operation; and a compensation system. The compensation system includes a force measurement system which measures forces applied to the wellhead; a force delivery system, which provides a compensating force to counteract at least a portion of the measured forces on the wellhead; and a control system which receives signals from the force measurement system indicative of the measured forces, and operates the force delivery system based on the measured forces.
