Continuous oil pipe heave compensation device

Abstract

The invention discloses a continuous oil pipe heave compensation device. The continuous oil pipe heave compensation device comprises an oil pipe winding drum which is arranged on a floating body, and a lifting device which is used for lifting a load suspended on an oil pipe; a load suspension point is arranged between the oil pipe winding drum and the load; the load suspension point is used for guiding the oil pipe which is guided out of the oil pipe winding drum to a drawing direction required by the load; the lifting device is connected with a measurement device which determines current phugoid motion and is connected with a central controller; the floating body is provided with a pipe guide mechanism which can adjust the length of the oil pipe between the oil pipe winding drum and the load suspension point; and the length of an oil pipe section between the oil pipe winding drum and the load suspension point is reserved and retracted by the pipe guide mechanism, so that heave compensation is realized and the tension of the oil pipe section between the oil pipe winding drum and the load suspension point is kept constant, the fatigue damage caused by reciprocating winding of the oil pipe winding drum is avoided, and the service life of the oil pipe is prolonged.

Description

technical field [0001] The invention relates to a compensating device for pulling a rope on a heavable floating body, in particular to a coiled tubing heave compensating device arranged on an ocean drilling floating body in the field of oil drilling equipment. Background technique [0002] With the rapid development of offshore oil exploitation and the maturity of coiled tubing technology, more and more coiled tubing drilling rigs and floating drilling platforms have been used. The floating drilling platform produces periodic up and down motion under the action of waves, and the heave motion of the floating drilling platform causes the entire drilling system to produce up and down motion. The acceleration brought about by this periodic heave motion increases The tension on the coiled tubing, if the coiled tubing works near its limit allowable stress, may cause the tension of the coiled tubing to exceed its allowable stress, thus causing damage to the coiled tubing. [0003]...

AI Technical Summary

Problems solved by technology

But it still has the following deficiencies: when the crane control system performs active heave compensation, the rope segment located between the rope drum and the load suspension point is rolled back and forth under the traction of the lifting device, which is easy to cause fatigue damage to the rope; , the tension on the rope is greatly increased during the unwinding process, and the tension on the rope is easy to exceed its allowable stress, causing damage to the rope

Especially in the field of oil exploitation, the strength of the tubing used in the coiled tubing drilling rig is low, and it is very easy to cause stress fatigue or damage due to cyclic stress and excessive stress

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