Single point anchor leg relaxation processing method

A processing method and technology of anchor legs, applied in the direction of ships, etc., can solve the problems of difficult control of construction progress, high ship costs, and large restrictions, and achieve the effect of reducing release and tie-back work, reducing construction costs, and having a large choice.

Inactive Publication Date: 2015-04-08
CHINA NAT OFFSHORE OIL CORP +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, the selection of operating ship resources is relatively limited, the cost of ships is high, and this method is greatly affected by weather factors (generally, the combined wave height is 1.5m or below before lifting can be carried out), and the construction progress is difficult to control

Method used

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  • Single point anchor leg relaxation processing method
  • Single point anchor leg relaxation processing method
  • Single point anchor leg relaxation processing method

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Embodiment Construction

[0032] The present invention adopts the following operation steps:

[0033] Step 1: On the offshore construction site—that is, arrange several limit tugs around the FPSO 3, and control the heading of the FPSO 3 through the limit tugs;

[0034] like figure 1 As shown, on the offshore construction site—that is, several limit tugs are arranged around the floating production storage and unloading tanker 3, in this embodiment: a main limit tug 1 and two auxiliary limit tugs 2 are arranged, and the limit tug The quantity and horsepower of the FPSO shall be determined according to the size of the FPSO 3, and the FPSO 3 can be limited in wind and waves by the trailing limit of the tugboat on the FPSO 3. Rotation under the action of the flow, so that the heading is near a constant angle, creating conditions for single-point in-service construction; at the same time, formulate safe and effective limit monitoring procedures and emergency measures to ensure the safety of construction shi...

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Abstract

The invention relates to a single point anchor leg relaxation processing method which comprises the following operation steps: (1) arranging a plurality of limiting tugs at the periphery of a floating type producing, storing and unloading tanker, and controlling the heading of the marine floating type producing, storing and unloading tanker through the limiting tugs; (2) overtensioning the relaxed anchor leg; (3) cutting off the excess chain rings of a relaxed anchor chain section between two tensioning points; (4) arranging a safety belt between two ends of the anchor chain cut off; (5) connecting the anchor chain cut off by a diver; and (6) releasing a tensioner to make the anchor leg work normally. The single point anchor leg relaxation can be processed under the condition that the marine floating type producing, storing and unloading tanker is in service without stopping the marine floating type producing, storing and unloading tanker, thus a large amount of releasing and connecting work of the marine floating type producing, storing and unloading tanker is reduced. In addition, the construction cost is reduced greatly, and the work efficiency is improved. Furthermore, the construction risk can be reduced to a controllable range, and the orderly construction is guaranteed greatly.

Description

technical field [0001] The invention relates to a mooring system, in particular to a method for treating the relaxation of single-point anchor legs of an inner turret type single-point mooring system, and belongs to the field of offshore petroleum engineering. Background technique [0002] APL's STP (Submerged Turret Production) internal turret single-point mooring system is a single-point system widely used in offshore floating production storage and offloading (FPSO). Affected by factors such as the installation error of single-point mooring and years of use, the individual anchor legs of the single-point system may have slack, and the tension of the anchor legs will be greatly reduced, and the tension will be transferred to other anchor legs. Taking the single-point mooring system (STP) with inner turret in the form of 9 legs (divided into 3 clusters) as an example, the load of the other two anchor legs in the same cluster with the slack anchor legs will increase greatly,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B21/00
Inventor 邓周荣刘义勇张人公苗春生王谦王火平刘书胜黄三平张印桐林守强宋春娜严国华高超黄佳瀚
Owner CHINA NAT OFFSHORE OIL CORP
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