CN101239651A - A self-heave anti-ice mooring system - Google Patents

Abstract

The present invention provides a self sinkage ice mooring system, including a mooring buoy, the top of the mooring buoy is connected with a mooring line, and jointed with a seamless pipe, and connected with one end of a ballast buoy via a cable chain, the other end of the ballast buoy is connected with an anchor via a cable chain, the cable chain between the ballast buoy and the mooring buoy is connected with a least one balancing buoy. The mooring system has a lower investment, suitable for working with different deeps.

Description

A self-heave anti-ice mooring system

technical field

The invention relates to a self-heave anti-icing mooring system, which is especially suitable for multi-point mooring of oil storage tankers or shuttle tankers in the process of "bee type" exploitation of marginal small oil fields.

Background technique

For marginal oil fields that are 20 kilometers away from the developed oil and gas fields and cannot rely on the developed oil and gas fields, small mobile production devices integrating production and oil storage are used for oil and gas exploitation. Like a bee, after mining a marginal oil field, move the small production unit to another marginal oil field for oil recovery, and recover all engineering investment through the production process of multiple marginal oil fields. In this process, it is necessary for the mooring system to meet the working environment of different water depths, so as to achieve the purpose of being reusable and meeting different mooring requirements. In addition, most of my country's marginal oil fields are distributed in the Bohai Bay, which belongs to the ice area, so the mooring system must meet the requirements of ice resistance.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a self-heave anti-ice mooring system with less investment and suitable for operations in different water depths.

In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

A self-heave anti-ice mooring system, including a mooring buoy, the top of which is connected with a mooring cable, connected with a seamless steel pipe, and connected with one end of a ballast buoy through an anchor chain, said The other end of the ballast buoy is connected to the anchor through an anchor chain, and at least one balance buoy is connected to the anchor chain between the ballast buoy and the mooring buoy.

As a preferred embodiment, in the above-mentioned self-heave anti-ice mooring system, the top of the mooring buoy is preferably conical; the lower half of the outer wall of the seamless steel pipe is preferably fixed with iron sheets or rings with larger diameters. Steel outer tube; the anchor used is preferably a suction anchor; each buoy can be divided into compartments; among each buoy, the ballast buoy has the largest volume, followed by the mooring buoy, and the structure, material and volume of each balance buoy are the same; The seamless steel pipe and the mooring buoy are hinged through connecting rods.

Because the present invention adopts the above technical scheme, it has the following advantages: 1. The present invention keeps the upper mooring buoy at a certain position below the water surface through the ballast change of the buoy on the mooring chain, so as to ensure mooring under different water depth conditions. "The exploitation of small marginal oilfields provides a convenient and feasible mooring method. 2. The upper mooring buoy of the present invention is equipped with a conical top, so that when the buoy hits the ice row with a low water level, the ice force is reduced, which is beneficial to the mooring operation of the oil tanker in the ice area. 3. The present invention uses a mooring buoy to hinge a seamless steel pipe through the water surface. The lower half of the outer wall of the steel pipe is welded with some iron sheets or steel outer pipes with a larger diameter. The pipe passes through it, avoiding the contact between the oil pipe and the ice, thus playing the role of anti-ice. 4. The ballast buoy at the bottom of the anchor chain of the present invention is fully loaded during mooring operations, increasing the weight of the anchor chain not only improves the horizontal stiffness of the anchor chain, but also shortens the length of the anchor chain, saving investment; When describing the mooring system, the ballast water in the buoy is evacuated to provide a certain buoyancy to help the anchor lifting operation. The combination of the ballast of the buoy and the suction anchor of the present invention is very convenient for the sinking and lifting of the mooring system, and is beneficial to the repeated use of the mooring system. 5. Each component in the present invention is a conventional product, which is convenient for production and realizes the purpose of one-time investment and multiple use, and is very suitable for the development of marginal small oil fields.

Description of drawings

Fig. 1 is the schematic diagram of self-heave anti-ice type mooring system of the present invention;

Fig. 2 is an enlarged view of part A in Fig. 1 .

Detailed ways

The method and device of the present invention will be described in detail below with reference to the drawings and embodiments.

As shown in Fig. 1 and Fig. 2, the present invention includes a suction anchor 1, which is connected to a mooring buoy 9 under the water surface through an anchor chain 3. A larger ballast buoy 4 is connected to the bottom of the anchor chain 3 , and balance buoys 5 , 6 , 7 , and 8 are arranged between the ballast buoy 4 and the mooring buoy 9 . The upper part of the mooring buoy 9 is conical, which plays an anti-icing effect. Earrings are arranged on the top, and mooring lines 12 are tied on the earrings. A supporting rod 11 is hinged on the mooring buoy 9 to connect the seamless steel pipe 10, and the lower half of the outer wall of the seamless steel pipe 10 is welded with some iron sheets or steel outer pipes with larger diameters. The oil delivery hose 2 penetrates the water surface through the seamless steel pipe, and plays the role of anti-icing, so as to achieve the effect of crude oil transportation.

In the above embodiments, the material of the mooring line 12 is nylon or polypropylene, so that the mooring line can not only float on the sea, but also has elasticity. In order to prevent frictional damage between the mooring line 12 and the mooring buoy 9, a section of friction-resistant material chain is connected to the mooring line at one end of the mooring buoy 9. The ballast buoy 4 has a larger volume and can be barrel-shaped or square. When the mooring operation is full load, the weight of the anchor chain is increased, which not only improves the horizontal stiffness of the anchor chain, but also shortens the length of the anchor chain, saving investment; Carry water, provide a certain buoyancy, and help the anchor lift operation. For the convenience of manufacture, the balance buoys 5, 6, 7, and 8 can be designed to be barrel-shaped, square or spherical in the same volume, and the ballast buoys 4 and the balance buoys 5, 6, 7, and 8 can increase the gravity of the anchor chain and enhance its suspension. The role of the chain line, and improve the horizontal stiffness. All buoys 4, 5, 6, 7, 8, and 9 of the present invention have compartments, which can be divided into 2 compartments, or 3 compartments, or multiple compartments to achieve the effect of ballast adjustment heave. The anchoring device is a suction anchor 1, which should have greater tensile and uplift resistance, so that the tanker can resist marine environmental loads, and its material is steel. The small-sized supporting rod 11 can be a round pipe, or a steel box girder or an I-shaped steel girder, and its two ends are respectively hinged with the mooring buoy 9 and the seamless steel pipe 10, and can adjust the seamless steel pipe 10 and the water level. Angle.

The self-heave anti-ice mooring system of the present invention can be used for multi-point mooring of various oil storage ships and shuttle tankers in the exploitation scheme of the marginal oil field in Bohai Bay.

Claims (7)

1. self-lifting/sinking ice resistance type anchoring system, comprise mooring buoy, the top of this mooring buoy is connected with mooring fast, and link to each other with solid drawn pipe, and link to each other with an end of ballast floating drum by anchor chain, the other end of described ballast floating drum links to each other with anchor by anchor chain, is connected with at least one balance floating drum on the anchor chain between ballast floating drum and the mooring buoy.

2. a kind of self-lifting/sinking ice resistance type anchoring system as claimed in claim 1 is characterized in that: the top of described mooring buoy is for conical.

3. a kind of self-lifting/sinking ice resistance type anchoring system as claimed in claim 1 is characterized in that: outer wall the latter half of described solid drawn pipe is fixed with the steel outer tube that iron plate or ring set have larger diameter.

4. a kind of self-lifting/sinking ice resistance type anchoring system as claimed in claim 1 is characterized in that: described anchor is a suction anchor.

5. a kind of self-lifting/sinking ice resistance type anchoring system as claimed in claim 1 is characterized in that: described each floating drum is equipped with subdivision.

6. a kind of self-lifting/sinking ice resistance type anchoring system as claimed in claim 1 is characterized in that: among various floating drums, described ballast floating drum volume maximum, mooring buoy secondly, the structure of each balance floating drum, material and volume are identical.

7. a kind of self-lifting/sinking ice resistance type anchoring system as claimed in claim 1 is characterized in that: described solid drawn pipe is hinged by being connected rod member with mooring buoy.

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