Deep-water single-point mooring middle water buoy recovery and lowering system and method
A single-point mooring and water buoy technology, applied in the field of mooring systems, can solve problems such as high requirements for operators, increased construction costs, and low work efficiency, so as to avoid release and tie-back, reduce construction costs, and reduce workload Reduced effect
Active Publication Date: 2020-02-14
SHENZHEN OFFSHORE OIL ENG UNDERWATER TECH CO LTD
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Problems solved by technology
At present, the operator usually completes the installation of the reclaimed water buoy recovery rigging by means of saturated diving. This operation method increases the construction cost, the work efficiency is low, the requirements for the operator are high, and it is not safe.
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[0078] 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.
[0079] figure 1 Shown is the structural representation of the deep-water single-point mooring system in some embodiments of the present invention, and the deep-water single-point mooring system can generally comprise FPSO (Floating Production Storage and Offloading, floating production storage and offloading tanker) 2 and be connected with FPSO 2 Several anchor legs 1 with the same structural form. The anchor leg 1 may generally include an ACT chain (adjustment chain) 11, an upper anchor cable (the first upper anchor cable 121 or the second upper anchor cable 122), a mid-water buoy 13, a lower anchor cable (the first lower anchor cable 151 or the second upper anchor cable Two lower anchor cables 152), counterweight cha...
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The invention relates to a deep-water single-point mooring middle water buoy recovery and lowering system and method. The method comprises the steps that a crane on an anchor mooring processing ship is used for placing a middle water buoy recovery rigging into the vicinity of a shackle on a middle water buoy, and a ROV is used for assisting the recovery rigging of the middle water buoy to be connected with the shackle; an ACT chain is lowered by a FPSO, a ROV is connected with a winch on the anchor mooring processing ship to the ACT chain, the winch recovers the ACT chain and a first upper cable to a deck, and the ACT chain is removed; the winch continues to recover the first upper cable until the middle water buoy floats out of the water surface; the middle water buoy recovery rigging isconnected to a crane on the anchor mooring processing ship and is hoisted; and the middle water buoy is hoisted and recovered to the upper ship and fixed, the middle water buoy is removed, and the middle water buoy is stored on a middle water buoy storage support. According to the system and method, the operation can be carried out under the condition that the FPSO is not stopped in position, theworkload is greatly reduced, the construction efficiency and the reliability are improved, and the yield loss of the oil field is reduced; the ROV is utilized to assist the launching operation, and the construction cost is reduced.
Description
technical field [0001] The invention relates to a mooring system, more specifically, to a system and method for recovering and lowering a midwater buoy in a deep-water single-point mooring. Background technique [0002] The internal turret single point mooring system is a single point mooring system widely used in floating production storage and offloading (FPSO), which usually includes 6-12 anchor legs with the same structure. Deep water (water depth above 300 meters) mooring anchor leg generally consists of adjustment chain (ACT chain), upper anchor cable, mid-water buoy, connecting plate (triangular plate or square plate), lower anchor cable, counterweight chain, lying ground cable and anchor piles etc. Different from the general shallow water mooring system, the deep water mooring system is divided into upper and lower anchor cables by an anchor cable in the anchor leg component and connected by midwater buoys. Among the various components of the anchor legs, the upper...
Claims
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IPC IPC(8): B63B21/50B63B17/00
CPCB63B17/00B63B21/50
Inventor 张人公高原高超刘耀江林守强孙锟郑申奎邓善博张云鹏
Owner SHENZHEN OFFSHORE OIL ENG UNDERWATER TECH CO LTD