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Riser self-tensioning type underwater production support buoy and mounting and recycling method thereof

A technology of buoys and risers, applied in the field of underwater production support buoys and their installation and recovery, can solve the stress change of the main body of the rigid riser, the increase of the tension force at the top of the rigid riser, the unfavorable rigid riser strength and fatigue resistance Performance and other issues to achieve the effect of improving strength and fatigue performance, reducing force and range of motion

Active Publication Date: 2017-04-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both mooring cables and rigid risers are passively tensioned by riser support buoys, so it is difficult to conveniently adjust the top tension of the two
Therefore, it is difficult for the above-mentioned riser support buoy to provide the top tension required by the mooring lines and the rigid riser at the same time
[0007] 2. The burial depth of the riser support buoy must be large enough (below 200m water depth), if the burial depth is insufficient, the riser support buoy is susceptible to lateral deviation due to the influence of shallow water waves, which will cause mooring cables and rigid risers The secondary distribution of the top tension force causes the main stress change of the rigid riser, which is not conducive to the strength and fatigue resistance of the rigid riser
[0008] 3. The riser support buoy is moored on the seabed with three mooring cables. When any one of the cables breaks and fails for some reason, the riser support buoy changes from three-point support to two-point support, resulting in loss of stability. The top tension of the mooring rope and the rigid riser is redistributed, and the top tension of the rigid riser increases sharply, and the excessive top tension will break the rigid riser and cause the system to collapse
[0009] Due to the above problems, the riser support buoys in the above systems are difficult to apply in engineering practice

Method used

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  • Riser self-tensioning type underwater production support buoy and mounting and recycling method thereof
  • Riser self-tensioning type underwater production support buoy and mounting and recycling method thereof
  • Riser self-tensioning type underwater production support buoy and mounting and recycling method thereof

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Embodiment Construction

[0063] The self-tensioning underwater production support buoy in the present invention will be further described below with reference to the accompanying drawings. The illustration of the present invention takes the self-tensioning underwater production support buoy in an ultra-deep water offshore oil and gas engineering development system with five rigid risers as an example.

[0064] Such as Figure 1-7 As shown, a standpipe self-tensioning type underwater production support buoy includes an outer layer buoy 1 and an inner layer buoy 6, wherein the outer layer buoy 1 is nested with a plurality of inner layer buoys 6;

[0065] The main body of the outer pontoon 1 is a cylindrical structure, and the lower edge of the outer wall of the outer pontoon 1 is connected to four cantilever pontoons 2, which are evenly distributed in the circumferential direction and in a radial shape. The end of the cantilever pontoon 2 adopts a truss structure 15. The outer end of the structure 15 is conn...

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Abstract

The invention discloses a riser self-tensioning type underwater production support buoy and a mounting and recycling method thereof. The riser self-tensioning type underwater production support buoy comprises an outer layer buoy and inner layer buoys, wherein the plurality of inner layer buoys are embedded in the outer layer buoy. As the outer layer buoy is in charge of providing a tensioning force of a mooring cable and the inner layer buoys provide top tensioning forces of rigid risers, the riser self-tensioning type underwater production support buoy can conveniently provide desired top tensioning forces of the rigid risers and the mooring cable at the same time; and requirements of practical engineering application can be only satisfied by using the riser self-tensioning type underwater production support buoy in a super deep water ocean oil and gas engineering development system. As vertical motions and stresses of the rigid risers and the outer layer buoy are decoupled, the stress and motion amplitudes of the rigid risers can be reduced to be the benefit of improving the strengths and fatigue performances of the rigid risers. When the buoy is biased, secondary distribution of the top tensioning forces among the rigid risers can be avoided to be the benefit of improving the strengths and fatigue performances of the rigid risers so that the rigid risers satisfy use requirements.

Description

Technical field [0001] The invention relates to an ultra-deep water ocean oil and gas engineering development system, in particular to an underwater production support buoy and its installation and recovery method. Background technique [0002] With the gradual depletion of oil and gas resources in land, offshore and mid-deep seas, offshore oil exploitation has gradually moved towards deep sea and ultra-deep sea. However, existing floating production platforms and underwater production systems are difficult to apply in deep water and ultra-deep water environments. [0003] The Chinese patent (CN 102434129 A) discloses an ultra-deep water offshore oil and gas engineering development system for oil and gas development in an ultra-deep sea environment with a water depth of more than 3000 m. The system includes a surface floating production device, a riser support buoy, an underwater oil production equipment, an upper flexible jumper, a lower rigid riser, and a subsea wellhead; the oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B35/44B63B9/06
CPCB63B35/4413B63B75/00
Inventor 甄兴伟吴佳豪黄一张崎王文华刘刚李红霞陈景杰董磊磊李志远
Owner DALIAN UNIV OF TECH
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