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A method for replacing mooring anchor legs

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

Active Publication Date: 2017-06-16
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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  • A method for replacing mooring anchor legs
  • A method for replacing mooring anchor legs
  • A method for replacing mooring anchor legs

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Embodiment Construction

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

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

[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 tugboats 2 at the stern of the FPSO 1 so that the heading of the FPSO 1 is near a constant angle;

[0066] Control the rotation of FPSO1 under the action of wind, waves and currents through the limit tugboat 2, so as to realize the adjustment of the heading of FPSO1, so that its heading is near a constant angle, creating conditions for the in-service construction of single point 20; at the same time , Formulate safe and effecti...

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Abstract

The invention discloses a method for replacing a mooring anchor leg, which includes: adjusting the heading of a floating production, storage and unloading oil tanker; installing the anchor point of a new anchor leg through an anchor point installation ship, and laying an anchor head chain and a new anchor cable ;Recover the newly anchored cable joint through the anchor chain laying ship, install the dynamometer, and implement tensioning operations on the new anchor leg; recover the adjustment chain, remove the dynamometer from the adjustment chain, and adjust the length of the adjustment chain; The counterweight chain is connected with the adjustment chain, and the new counterweight chain is laid to the seabed; the old anchor leg is cut by the saturation diving support vessel and the air diving support vessel, and the old upper anchor cable is recovered; the new upper anchor cable is installed, and the installation The new upper anchor cable is connected to the new counterweight chain. The invention can realize the replacement of the mooring old anchor legs when the floating production storage and offloading tanker is in service, avoiding the release and tie-back of the floating production storage and offloading tanker, greatly reducing the workload and improving the construction efficiency And reliability, and reduce oil field production loss and production value loss.

Description

technical field [0001] The invention relates to the field of offshore oil engineering, in particular to a mooring anchor leg replacement method. Background technique [0002] At present, the internal 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 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 high. Broken wires and loose strands of the upper anchor cable, and the shedding of the counterweight on the counterweight chain are common damages. When the damage reaches a certain level, the maximum safe load value that the anchor leg can bear will be lower than that of the single point mooring system The safe load value required at design time. ...

Claims

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Application Information

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Patent Type & Authority Patents(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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