Marine riser and offshore drilling system

An offshore drilling and riser technology, which is applied to underwater drilling, drilling equipment, drill pipes, etc., can solve the problems of waste of resources, large amount of engineering, and large area, so as to reduce engineering difficulty and slow down the sinking speed. , the effect of taking up less space

Inactive Publication Date: 2016-06-01
上海海郑海洋建设工程技术有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method causes duplication of labor, is very time-consuming and laborious, and wastes resources
[0009] Third, before the drilling project starts, it is necessary to dig the subsea wellhead 3 on the seabed G in advance. The subsea wellhead 3 generally needs to occupy an area of ​​about 4m2, and its caliber is much larger than that of the oil well, which occupies a large area and requires a large amount of work. Once the wrong site is selected, the subsea wellhead 3 will be abandoned, resulting in project waste
In addition, when the riser 2 is docked with the subsea wellhead 3, it needs to be operated by an underwater robot. The docking operation is technically difficult and time-consuming, and generally takes 1 to 2 months to complete

Method used

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  • Marine riser and offshore drilling system
  • Marine riser and offshore drilling system
  • Marine riser and offshore drilling system

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Embodiment Construction

[0060] Since the drilling operation may be carried out in the sea area with a water depth of 3000m, the pressure on the riser at the end close to the seabed is very high. In order for the riser to resist water pressure, the riser wall needs to have sufficient thickness, which greatly increases the riser's volume and weight.

[0061] In order to meet the buoyancy requirements, the diameter of the outer pipe (that is, the outer diameter of the riser) is very large. For example, the outer diameter of each riser in the "981" drilling platform is 1.37m. Taking the length of 22m as an example, the heaviest each riser At least 65 tons, the weight of the 3000m long riser will reach 7000 tons. Due to the huge volume and weight, when installing the riser, the connection between adjacent risers and between the riser and other devices can basically only be connected by screws, which is laborious and time-consuming, and the installation efficiency is very low.

[0062] In order to make th...

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Abstract

The invention provides a marine riser and an offshore drilling system. The marine riser comprises a first pipe and buoyancy pipes tied to the outer circumferential face of the first pipe and provided with closed inner cavities. The inner cavities of the buoyancy pipes are filled with gas. The gas pressure in the buoyancy pipes is not smaller than the barometric pressure. Compared with an oil filling mode in the prior art, energy is saved.

Description

technical field [0001] The invention relates to the field of marine structure engineering, in particular to a water riser and an offshore drilling system. Background technique [0002] Such as figure 1 As shown, the existing offshore drilling system includes a drilling platform 1, a riser 2 and a subsea wellhead 3, a part of the drilling platform 1 is exposed above the sea level S, the subsea wellhead 3 is located on the seabed G, and one end of the riser 2 extends to the drilling platform 1. The other end extends into the subsea wellhead 3, and the subsea wellhead 3 is sealed by a cover plate 4. The riser 2 connects the drilling platform 1 and the subsea wellhead 3, and is used for transporting drilled objects such as mud and gravel during drilling, and used as an oil pipeline for transporting oil during oil production. [0003] Wherein, the riser 2 includes an outer pipe 2a and an inner pipe 2b which are sheathed sequentially from outside to inside. During drilling oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B7/12
Inventor 海飞郑玮
Owner 上海海郑海洋建设工程技术有限公司
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