阅读说明：本技术 一种用于圆筒型fpso调头转向的方法 (Method for turning round and steering cylindrical FPSO ) 是由 梁超 黄海滨 李文博 历超 肖同家 李振永 柳宇 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种用于圆筒型FPSO调头转向的方法,采用三条拖轮对圆筒型FPSO进行转向,在拖轮B和拖轮C的方位控制下,由拖轮A将圆筒型FPSO拖拽至宽阔水域,将拖轮B上的拖带缆增加至两根拖带缆,然后由拖轮A和拖轮C进行方位控制,拖轮B带动圆筒型FPSO转动,应用本发明所公布的方法,可以使圆筒型FPSO在水中的方位调整更加容易控制,即使在海况不理想的情况下,也不容易产生轴向旋转,降低了船体方位以及运动轨迹的掌控难度和施工风险。(The invention discloses a method for turning round and steering a cylindrical FPSO (floating production storage and offloading) by adopting three tugs to steer the cylindrical FPSO, wherein the cylindrical FPSO is dragged to a wide water area by the tug A under the azimuth control of the tug B and the tug C, a towing cable on the tug B is added into two towing cables, then the azimuth control is carried out by the tug A and the tug C, and the tug B drives the cylindrical FPSO to rotate.)

1. A method for turning round a cylindrical FPSO is realized by the following steps:

s1, dragging the cylindrical FPSO from the starting point to a wide water area by three tugs, and keeping the cylindrical FPSO in a stable state;

s2, changing the connection mode of the towing rope between the towing wheel and the cylindrical FPSO;

s3, uniformly commanding the three tugs to drive the cylindrical FPSO to rotate to the designated direction;

and S4, dragging the cylindrical FPSO back to the starting point by the tug, and completing the turning around and steering of the cylindrical FPSO.

2. The method for cylindrical FPSO turnaround as claimed in claim 1, wherein:

step S1 includes:

s11, prefabricating a towing wheel cable position on the cylindrical FPSO, and connecting a nylon cable at the cable position;

s12, leading out a towing cable from a towing wheel, connecting the towing cable and a nylon cable into a towing cable through a snap ring, wherein two towing cables are led out from the towing wheel A and are connected with a cylindrical FPSO;

s13, under the control of the orientation of the tug C and the tug B, the tug A drags the cylindrical FPSO to a wide water area, and then the three tugs keep the cylindrical FPSO in a stable state.

3. Method for cylindrical FPSO turnaround as claimed in claim 2, wherein:

step S2 specifically includes: 1 towing cable between the towing wheel A and the cylindrical FPSO is removed, and two towing cables are arranged between the towing wheel closer to the departure point and the cylindrical FPSO before the steering of the cylindrical FPSO is completed.

4. Method for cylindrical FPSO turnaround according to claim 3, wherein: step S3 specifically includes: under the unified command of the command center, the tug closer to the starting point drives the cylindrical FPSO to complete steering, the other two tugs keep the balance of the cylindrical FPSO, and the cylindrical FPSO reaches the designated direction, namely the steering of the cylindrical FPSO is completed.

Technical Field

The invention relates to a method for turning round a cylindrical FPSO.

Background

At present, mainly be to turning round of ship type structure FPSO and turn to, because at the in-process that tow and position change, for the cylinder type structure, the tug can adopt to help or push away the mode that ship type structure carries out FPSO's the operation of turning to, ship type structure FPSO turns to the process and controls more easily like this, turns to the operation safe and reliable relatively.

However, for the direction adjustment operation of the FPSO with the cylindrical structure, the whole body is cylindrical, the tugboat cannot control the direction in a leaning or pushing mode, and only a cable pulling mode is adopted, so that the direction of the cylindrical FPSO in water is difficult to control, axial rotation is easy to generate under the condition of unfavorable sea conditions, and the control difficulty and the construction risk of the direction and the movement track of the ship body are increased.

Disclosure of Invention

The invention provides a method for turning round a cylindrical FPSO (floating production storage and offloading), which can be used for turning round the cylindrical FPSO.

In order to solve the technical problem, the invention provides a method for turning round a cylindrical FPSO, which is realized by the following steps:

s1, dragging the cylindrical FPSO from the starting point to a wide water area by three tugs, and keeping the cylindrical FPSO in a stable state;

s2, changing the connection mode of the towing rope between the towing wheel and the cylindrical FPSO;

s3, uniformly commanding the three tugs to drive the cylindrical FPSO to rotate to the designated direction;

and S4, dragging the cylindrical FPSO back to the starting point by the tug, and completing the turning around and steering of the cylindrical FPSO.

Further, step S1 includes:

s11, prefabricating a towing wheel cable position on the cylindrical FPSO, and connecting a nylon cable at the cable position;

s12, leading out a towing cable from a towing wheel, connecting the towing cable and a nylon cable into a towing cable through a snap ring, wherein two towing cables are led out from the towing wheel A and are connected with a cylindrical FPSO;

s13, under the control of the orientation of the tug C and the tug B, the tug A drags the cylindrical FPSO to a wide water area, and then the three tugs keep the cylindrical FPSO in a stable state.

Further, step S2 is specifically: 1 towing cable between the towing wheel A and the cylindrical FPSO is removed, and two towing cables are arranged between the towing wheel closer to the departure point and the cylindrical FPSO before the steering of the cylindrical FPSO is completed.

Further, step S3 is specifically: under the unified command of the command center, the tug closer to the starting point drives the cylindrical FPSO to complete steering, the other two tugs keep the balance of the cylindrical FPSO, and the cylindrical FPSO reaches the designated direction, namely the steering of the cylindrical FPSO is completed.

The invention has the technical effects that: the invention adopts three tugs to steer the cylindrical FPSO, the tug A drags the cylindrical FPSO to a wide water area under the direction control of the tug B and the tug C, then the connection mode between the dragging cable and the cylindrical FPSO is changed, and the tug closer to the starting point drags the cylindrical FPSO to steer under the unified command of the command center.

Drawings

Fig. 1 is a top view of a cylindrical FPSO towed by a tow wheel a according to the present invention.

Figure 2 is a top view of the tug of the invention connected to a cylindrical FPSO via a tug line.

FIG. 3 is a top view of a cylindrical FPSO of the present invention prior to turning.

FIG. 4 is a top view of the present invention with a tug driving a cylindrical FPSO for steering.

Reference numerals: 1. cylindrical FPSO; 2. A tug A; 3. a tug B; 4. a tug C; 5. a nylon cable; 6. a streamer; 7. a snap ring.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

In the embodiment, as shown in fig. 1 to 4, a method for turning round a cylindrical FPSO can smoothly turn the cylindrical FPSO1 in a wide water area, the adjustment is easier to control, axial rotation is not easy to generate even under the condition of unfavorable sea conditions, and the difficulty in controlling the orientation and the motion track of a ship body and the construction risk are reduced. The specific implementation of each step is as follows:

s1, dragging the cylindrical FPSO1 from a starting point to a wide water area by three tugs, and keeping the cylindrical FPSO1 in a stable state;

step S1 may be specifically subdivided into the following steps:

s11, prefabricating a towing wheel cable position on a cylindrical FPSO1, and connecting a nylon cable 5 at the cable position;

the mooring positions are located on the side of the cylindrical FPSO1, and 6 mooring positions are arranged and divided into 3 groups, and the circumferential interval angle between each group is 120 degrees.

S12, a towing cable 6 is led out of the towing wheel, the towing cable 6 and the nylon cable 5 are connected into a towing cable through a snap ring 7, and two towing cables are led out of the towing wheel A2 and are connected with a cylindrical FPSO 1;

the towing cable 6 and the nylon cable 5 are connected through a snap ring 7 to form a towing cable, wherein the towing cable 6 is connected with a towing wheel, and the nylon cable 5 is connected with a cylindrical FPSO 1.

S13, under the control of the orientation of the tug C4 and the tug B3, the tug A2 drags the cylindrical FPSO1 to a wide water area, and then the three tugs keep the cylindrical FPSO1 in a stable state.

After the tug drags the cylindrical FPSO to a wide water area, the tug B3 and the tug C4 can ensure the stability of the cylindrical FPSO1 by keeping proper tension on the tug cable.

S2, changing the connection mode of the towing rope between the towing wheel and the cylindrical FPSO 1;

step S2 specifically includes: the 1 towing rope between the towing wheel a2 and the cylindrical FPSO1 is released, and two towing ropes are provided between the towing wheel closer to the departure point and the cylindrical FPSO1 before the steering of the cylindrical FPSO1 is completed.

When the connection mode of the towing rope between the towing wheel and the cylindrical FPSO1 is changed, the field worker is required to judge that the towing wheel B3 or the towing wheel C4 is closer to the starting point. In the present embodiment, the tug B3 is explained in detail as being closer to the starting point.

S3, uniformly commanding the three tugs to drive the cylindrical FPSO1 to rotate to a designated direction;

under the unified command of the command center, the tug closer to the starting point drives the cylindrical FPSO1 to complete steering, the other two tugs keep the balance of the cylindrical FPSO1, and the cylindrical FPSO1 reaches the designated direction, namely the steering of the cylindrical FPSO is completed.

In step S3, when the tug C4 and tug a2 perform the steering control, the roll of the cylindrical FPSO1 is mainly prevented, and the cylindrical FPSO1 is stabilized. When the cylindrical FPSO1 is rotated, the power for rotation comes from the tug B3. The tug C4 and the tug A2 can rotate correspondingly when the cylinder type FPSO1 rotates, and a certain pulling force is kept on the towing rope, so that the stability of the cylinder type FPSO1 is ensured.

S4, the cylindrical FPSO1 is dragged back to the starting point by the tug, and the turning and steering of the cylindrical FPSO1 are completed.

The tug B3 drives the cylinder FPSO1 to return to the starting point, and in the process of pulling back, the tug A2 and the tug C4 keep the stable state of the cylinder FPSO 1.

The invention is specifically completed by the following steps:

(1) selecting proper cable positions around the cylindrical FPSO1, and connecting a high-strength nylon cable 5 at each cable position; (2) as shown in fig. 1, a towing wheel leads out a towing cable 6, the towing cable 6 is connected with a nylon cable 5 through a snap ring 7, the towing cable and the nylon cable form a towing cable, wherein the towing wheel B3 and the towing wheel C4 are connected with a cylindrical FPSO1 through one towing cable, and the towing wheel a2 is connected with the cylindrical FPSO1 through two towing cables, so that an eight-shaped connection form is formed; (3) the command center uniformly coordinates and commands a tug A2, a tug B3 and a tug C4, and under the orientation control of the tug B3 and the tug C4 on the cylindrical FPSO1, the tug A2 tows the cylindrical FPSO1 to a specified wide water area; (4) after the cylindrical FPSO1 arrives at a specified wide water area, a towing cable on a towing wheel A2 is removed by using a cabled boat, and meanwhile, two towing cables are connected to a towing wheel B3 and form a splayed connection form; (5) the command center uniformly commands and coordinates a tug A2, a tug B3 and a tug C4, wherein the tug A2 and the tug C4 carry out azimuth control, and the tug B3 drives a cylindrical FPSO1 to rotate to a specified position.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.