Offshore floating drilling platform drill string heave compensation device

Abstract

The invention discloses a heave compensation device for a drill string of an ocean floating drilling platform. In the heave compensation device of a crane, a composite hydraulic cylinder is used as a heave compensation hydraulic cylinder, and the high-pressure hydraulic oil output by a hydraulic pump passes through a compensation control valve. It leads to the rodless chamber of the inner cylinder of the composite compensation hydraulic cylinder and the rod chamber of the outer cylinder, so that a controllable additional force is provided to the piston rod of the outer cylinder, which is equal to the hydraulic pressure acting on the rodless chamber of the outer cylinder of the compensation hydraulic cylinder Combined forces provide support to the crane. The direction and magnitude of the additional force are controlled according to the heave motion of the platform to improve the compensation effect of the heave compensation system. The control unit sends a control command to the hydraulic system according to the detected movement speed of the platform in the vertical direction, drives the piston of the compensation hydraulic cylinder to push the crane movement, and compensates the heave movement of the platform, so that the crane, traveling block and hook are within the allowable The range is at rest in the vertical direction relative to the bottom of the well.

Description

technical field [0001] The invention relates to a hydraulic control system characterized by electro-hydraulic control technology, in particular to a heave compensation device for a drill string of an ocean drilling platform. Background technique [0002] With the depletion of land resources, the strategic vision of the world's economic development is focused on the ocean, and the development of marine technology and high-tech equipment is particularly important. In the field of petroleum, with the development of China's economy, especially the rapid development of the petrochemical and automobile industries as the pillar industries, the contradiction of insufficient supply of oil and natural gas has become increasingly prominent. In view of the depletion of onshore oil resources, marching into the deep sea has become an inevitable trend. At present, the maximum working water depth of offshore oil drilling rigs has exceeded 3000m, and will continue to develop in a deeper dir...

AI Technical Summary

Problems solved by technology

[0005] The active heave compensation system has good compensation effect and strong adaptability, but due to the large mass of the drill string and frequent up and down reciprocating movements, a large amount of energy will be consumed in the compensation process

[0006] The passive heave compensation system basically does not require the system to provide additional energy during the compensation process, and the system is simple and has been widely used, but the compensation effect is not very ideal, and there is a certain hysteresis phenomenon

[0007] The semi-active heave compensation system can combine the advantages of both, but the system structure is more complicated and the manufacturing cost is higher

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