A floating jack-up drilling platform

Abstract

Disclosed is a floating type self-elevating drilling platform, having: a main deck (1) and an upper structure thereof, a floating pad (7), pile legs (6), a lifting mechanism (5) and a mooring system. The area and thickness of the floating pad (7) is greater than those of the main deck (1), and the pad is provided with a moon pool (9) in the middle and is internally divided into a plurality of cabins. A well drilling module is located at or close to a position above the geometrical centre of the main deck. There are three pile legs (6), all being of a truss structure; a bottom part of each pile leg (6) is in rigid connection with the floating pad (7); the main deck (1) is perpendicularly lifted and lowered along the pile legs via the lifting device (5), and is fixed at a pre-determined height; each pile leg (6) contains an upper and lower sections of hollow sealed body (61, 63), and during the operation, the waterline is located within a height range of the upper section and is positioned via the mooring system. Different from a traditional self-elevating platform, the present platform is not in contact with the seabed during the operation, and has a floatation centre higher than the centre of gravity, a good movement performance, and a high oil storage capacity, and the floating self-elevating drilling platform can be used for oil and gas drilling and production in a sea area within a water depth of 500 metres and is particularly suitable for a water depth of 200-500 metres.

Description

technical field [0001] The invention relates to offshore oil and gas drilling equipment, in particular to a floating self-elevating drilling platform. Background technique [0002] In today's world where the demand for energy is getting stronger and the onshore oil and gas resources are becoming increasingly depleted, opening up wider energy supply channels has become the focus of the development of all countries in the world today, and the development of offshore oil and gas extraction technology is particularly rapid. The proportion of total offshore oil and gas production in the world's total oil and gas production has risen from 20% in 1997 to more than 40% at present, of which deep-sea oil and gas production accounts for more than 30% of offshore oil and gas production. Therefore, for the three major offshore drilling equipment, jack-up drilling platform, semi-submersible drilling platform and drilling ship, deep water is a major development trend. [0003] Jack-up dri...

AI Technical Summary

Problems solved by technology

If a new semi-submersible platform and drilling ship are built for the oil area with a water depth of 200-500 meters, it can meet the technical and construction requirements of mining, but it will cost a lot of money, which can be described as "overkill", and the economy is not good

On the other hand, there are currently a large number of jack-up drilling platforms, but a considerable part of these in-service platforms cannot be used anymore due to the life of the pile legs and spud cans. In the next ten years, there will be a large number of jack-up drilling platforms. Platform will be retired

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