Passive type deep sea heave compensation device for ocean platform drilling

Abstract

The invention discloses a passive type deep sea heave compensation device for ocean platform drilling. A vertically arranged guide slot is formed in a drilling derrick (3); a vertically arranged spring (5) is fixedly arranged at the top of the guide slot; a pressing plate (6) located in the guide slot is fixedly arranged at the bottom of the spring (5); a floating overhead crane (7) is located under the pressing plate (6); and a center grooved wheel (8) provided with multiple wire ducts on the column surface is mounted in the floating overhead crane (7) in a rotatable manner. The heave compensation device disclosed by the invention further comprises a large hook (9), a water isolation pipe (10), a large hook lifting rope (11), a steel wire rope (12) and a displacement compensation mechanism I and a right displacement compensation mechanism II which are respectively arranged on the left and right sides of a stand (2). The displacement compensation mechanism I and the right displacementcompensation mechanism II are symmetrically disposed on the left and right. The passive type deep sea heave compensation device has the beneficial effects of simple structure, capability of verticallydropping down the water isolation pipe, high reliability, high compensation efficiency and high system response speed.

Description

technical field The invention relates to the technical field of heave compensation devices for marine floating platforms, in particular to a passive deep sea heave compensation device for offshore platform drilling. Background technique 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 direction. Working i...

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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 phenomenon

In addition, when the riser is lowered from the drilling platform, under the action of seawater, the riser tilts, that is, it does not fall vertically, causing the drill pipe to tilt when it is lowered into the riser, which further leads to The drill bit connected to the drill pipe is inclined to drill into the bottom of the seabed, causing serious damage to the drill bit

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