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Mooring anchor leg replacement method

A replacement method, mooring anchor technology, applied in the direction of anchor arrangement, ship parts, transportation and packaging, etc., can solve the problems of huge workload and loss of production

Active Publication Date: 2016-03-02
SHENZHEN OFFSHORE OIL ENG UNDERWATER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it involves the release and tie-back of the floating production storage and offloading tanker, the workload is huge, and it needs to be carried out when the oilfield is shut down, and the production loss is relatively serious

Method used

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  • Mooring anchor leg replacement method
  • Mooring anchor leg replacement method
  • Mooring anchor leg replacement method

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Embodiment Construction

[0062] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0063] The invention provides a method for replacing mooring anchor legs.

[0064] Such as Figure 1 to Figure 12 As shown, in the first embodiment of the present invention, the method for replacing the mooring anchor leg includes the following steps:

[0065] Step S10, arranging several limit tugs 2 at the stern of the floating production, storage and offloading tanker 1 so that the heading of the floating production, storage and offloading tanker 1 is near a constant angle;

[0066] The limit tug 2 is used to control the rotation of FPSO1 under the action of wind, waves and currents, so as to adjust the heading of FPSO1 so that its heading is near a constant angle, creating conditions for single point 20 in-service construction; , Fo...

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Abstract

The invention discloses a mooring anchor leg replacement method comprising the following steps: adjusting the heading of a floating production storage and offloading oil tank; installing an anchor point of a new anchor leg through an anchor point installation vessel, and laying an anchor head chain and a new lower anchor cable; recycling a new lower anchor cable connector through an anchor chain laying vessel, installing a dynamometer, and tensioning the new anchor leg; recycling an adjustment chain, removing the dynamometer from the adjustment chain, and adjusting the length of the adjustment chain; connecting a new balance weight chain to the adjustment chain, and laying the new balance weight chain on a seabed; cutting an old anchor leg through a saturation diving support vessel and an air diving support vessel, and recycling an old upper anchor cable; and installing a new upper anchor cable, and connecting the installed new upper anchor cable to the new balance weight chain. A mooring old anchor leg can be replaced under in-service production of the floating production storage and offloading oil tank, disengaging and back-jointing of the floating production storage and offloading oil tank are avoided, the workload is greatly reduced, the construction efficiency and reliability are improved, and the yield loss and output loss of oil fields are reduced.

Description

Technical field [0001] The invention relates to the field of offshore petroleum engineering, in particular to a method for replacing anchor legs of a mooring. Background technique [0002] At present, the submerged turret single point mooring system (STP, Submerged Turret Production) is a single point mooring system widely used in floating production storage and offloading tankers (FPSO, Floating Production Storage and Offloading). After the oilfield facilities are put into use, after many years of operation, the anchor legs of the mooring system are in a state of repeated contraction and stretching for a long time, and the probability of damage is very high. Broken wires and loose strands of the upper anchor cable, as well as the falling off of the counterweight on the counterweight chain are common damage situations. When the damage reaches a certain level, the maximum safe load value that the anchor leg can bear will be lower than the single-point mooring system The safety lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B21/50
Inventor 苗春生高原马超高超郑亮马晓
Owner SHENZHEN OFFSHORE OIL ENG UNDERWATER TECH CO LTD
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