A method of constructing suction anchors using drilling ships
A technology for suction anchors and drilling ships, applied in infrastructure engineering, construction, etc., can solve the problems of high installation costs, affect the construction period, increase construction costs, etc., achieve accurate lowering positions, shorten construction periods, and save construction costs Effect
Inactive Publication Date: 2021-06-11
GUANGZHOU MARINE GEOLOGICAL SURVEY +1
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Problems solved by technology
Conventional suction anchors now require construction and installation on large engineering ships. Using a marine crane with heave compensation function and supporting 1 or 2 working-level ROVs for auxiliary installation, the installation cost is high; especially when the suction anchor is used as an offshore drilling seabed When the wellhead foundation is used, if another engineering ship is used to construct the suction anchor, the engineering ship will first arrive at the drilling construction sea area to complete the suction anchor construction, and then the drilling ship will drill again, which will increase the construction cost
In addition, there are generally fewer ships that can meet the installation and construction requirements. If the engineering ship schedule conflicts with the drilling cycle, the construction cycle will be affected.
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Embodiment Construction
[0029] The present invention will be further described below in conjunction with embodiment.
[0030] A method for constructing a suction anchor by using a drilling ship. The existing drilling equipment on the drilling ship is used to construct the suction anchor. The specific construction steps include the following:
[0031] see figure 1 , figure 2 , Figure 6 and Figure 7 , the drilling ship docks with the suction anchor and fixes it on board: after the drilling ship 2 docks, the suction anchor 1 is placed on the moon pool cover plate 2-1 at the central position of the drilling ship 2 through a shore tower crane or a floating crane at sea, and the monthly The cover plate 2-1 of the moon pool is located above the moon pool 2-2, and the suction anchor is fixed on the cover plate of the moon pool to prevent the risk of overturning during sea transportation; the diameter of the suction anchor 1 is designed according to the square size of the moon pool, Ensure that the suc...
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A method for constructing a suction anchor by using a drilling ship. The existing drilling equipment on the drilling ship is used to carry out the construction of the suction anchor. The specific construction steps include the following: the drilling ship is docked with the suction anchor and fixed on the ship: the suction anchor is placed on the moon pool on the drilling ship Cover plate; suction anchor fixed installation: fix the suction anchor on the combined sling on the drilling tower; pump skid installation: install the pump skid on the cone top of the suction anchor; lower the suction anchor; penetrate the suction anchor Submarine mud surface; combined sling and pump skid recovery. The invention adopts the drilling conditions of the drilling ship itself, uses the top drive on the drilling ship to lift the suction anchor, passes through the moon pool on the hull, connects the suction anchor joint by joint through the drill pipe, and uses the pump skid to control the penetration of the suction anchor. The construction process only needs to be carried out on the drilling ship, which reduces the construction cost and ensures the normal progress of the construction period.
Description
technical field [0001] The invention relates to a construction method of a suction anchor, in particular to a method for constructing a suction anchor by using a drilling ship. Background technique [0002] The suction anchor is a steel cylinder with a closed top and an open bottom. It is placed vertically on the mud surface of the seabed and penetrates into the soil by its own weight. With the help of a suction pump, water is pumped from the inside of the cylinder to the outside. The bottom of the cylinder is sealed by the soil. Pressure acts on the top of the cylinder, pushing the suction anchor further into the soil to complete the installation. The friction between the suction anchor and the formation can provide a large vertical bearing capacity and horizontal bearing capacity, which can be used to support submarine structures or support offshore equipment as a submarine foundation. Therefore, suction anchors are widely used in offshore wind power foundations, offshore ...
Claims
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IPC IPC(8): E02D27/24E02D27/52E02D15/08
CPCE02D15/08E02D27/24E02D27/525E02D2250/0061E02D2250/0092
Inventor 叶建良宋刚寇贝贝陆敬安邵玉涛牛庆磊刘晓林刘春生崔淑英陈晓林
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY