Gear-rack displacement multiplication type drill string heave compensator for floating drilling platform

Abstract

The invention discloses a gear-rack displacement multiplication type drill string heave compensator for a floating drilling platform, which comprises a traveling block (1), a large hook (2), a gear-rack mechanism (4), a rigid rod (3) and a compensating cylinder system. The compensating cylinder system comprises a piston-type hydraulic cylinder (5) and a gas/liquid storage tank (6), the hydraulic cylinder (5) is fixedly connected onto the traveling block (1), the large hook (2) is connected with the traveling block (1) through a steel wire rope (7), the rigid rod (3) is arranged on the traveling block (1) and connected with the a piston rod through the gear-rack mechanism (4), and a gear shaft for a gear in the gear-rack mechanism (4) is connected with a variable frequency motor. The gear-rack displacement multiplication type drill string heave compensator has the advantages that a driving compensating system and a driven compensating system are adopted to simultaneously achieve response sensitivity, rapidness and precision of compensation of the driving system and low energy consumption and the like of the driven system, the compensator is simple in structure and fine in compensating effect, and adaptability and reliability of the compensator are enhanced.

Description

technical field [0001] The invention relates to the technical field of heave compensation devices for marine floating platforms, in particular to a rack and pinion displacement multiplying drilling string heave compensation device for floating drilling platforms. 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 w...

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Problems solved by technology

However, it is difficult to effectively suppress the impact of ultra-low frequency and broadband random vibration waves, currents, and tides, and the compensation accuracy is not high, so the compensation effect of the passive compensation system is not ideal, and there is a certain hysteresis phenomeno

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