Drilling column heave compensator for floating drill platform in the sea

Abstract

The invention discloses a heave compensation device for a drilling string of an ocean floating drilling platform. Lead the high-pressure hydraulic oil in the accumulator to the rod chamber of the compensation hydraulic cylinder through the compensation control valve, thereby providing a controllable additional force, which is controlled according to the heave movement of the platform, thereby improving the conventional passive heave The effect of compensation. 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 drive the moving pulley, and compensates the heave movement of the platform under the action of the wire rope or chain, so that the beam and the hook are in the same position. It is at rest in the vertical direction relative to the bottom of the well within the allowable range. Through the control of the controller, the hydraulic pressure in the rod chamber is adjusted. The invention overcomes the disadvantages of slow compensation response speed of the traditional passive heave compensation system, and poor compensation effect caused by accumulator pressure fluctuation and frictional force. Due to the oil supply to the rod cavity, the energy consumption is effectively controlled, the operating cost of the system is reduced, and the compensation accuracy is improved.

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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