Drilling column heave compensator for floating drill platform in the sea

A technology for drilling platform and heave compensation, applied in the field of hydraulic control system, can solve the problems of high manufacturing cost, large energy consumption, large drill string quality, etc., to reduce equipment weight and manufacturing cost, limit energy consumption, and improve compensation effect Effect

Inactive Publication Date: 2008-02-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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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

Method used

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  • Drilling column heave compensator for floating drill platform in the sea

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with drawings and embodiments.

[0022] As shown in the figure, the crossbeam 2 is fixedly connected with the hook 1, and is connected with the travel block and the compensation hydraulic cylinder 3 which are fixedly connected together through the wire rope 5. A pressure sensor 13 is installed in the rod chamber of the compensation hydraulic cylinder 3 and a pressure sensor 21 is installed in the rodless chamber. The ratio of the outer diameter of the piston rod of the compensation hydraulic cylinder 3 to the inner diameter of the hydraulic cylinder is 1:1.005-1:1.01, and the piston rod is a hollow rod. The inlet of the charging pump 8 is connected with the oil tank 9, and the outlet is respectively connected with the P port of the compensation control valve 12, the A port of the power failure protection valve 20 and the rodless chambers of the two compensation hydraulic cylinders 3 through the check v...

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Abstract

The present invention discloses one kind of heave compensation system for drill stem of marine floating drilling platform. High pressure hydraulic oil is led from the energy accumulator through a compensation control valve to the compensating hydraulic cylinder, so as to provide one additional force controlled based on the heave motion of the platform for raised compensation effect. The control unit detects the vertical motion of the platform to control the hydraulic system for compensating the heave motion of the platform by means of the steel cable or chain to make the crossbeam and rotary hook in vertically quiescent state relative to the well bottom. The present invention is superior to traditional passive heave compensation system, and has high reaction speed, high compensation precision, low power consumption and low operation cost.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B17/08
Inventor 张彦廷王鸿膺陈国明徐兴平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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