CN117026921A

CN117026921A - A kind of wellhead piece installation method

Info

Publication number: CN117026921A
Application number: CN202310805556.7A
Authority: CN
Inventors: 张耀; 汪春标; 李振鹏; 闫运强; 韩辉; 张国伟; 郭鹏; 李国伟; 王松; 丰茂仁; 李志强; 黎超
Original assignee: Offshore Oil Engineering Qingdao Co Ltd
Current assignee: Offshore Oil Engineering Qingdao Co Ltd
Priority date: 2023-07-03
Filing date: 2023-07-03
Publication date: 2023-11-10
Anticipated expiration: 2043-07-03
Also published as: CN117026921B

Abstract

The invention discloses a wellhead sheet mounting method, which comprises the following steps: s1, prefabricating wellhead plates and deck plates on land; s2, enabling the upper upright post to penetrate through the deck plates, and reinforcing the deck plates by tie bars; s3, a sliding shoe is arranged in the middle of the bottom surface of the bottommost deck plate, wellhead plates are arranged on two sides of the sliding shoe through temporary supporting tubes, and the wellhead plates are connected with the bottommost deck plate through chain links; s4, placing the support tube on the bottommost armor plate, and moving the whole assembly to a transport ship through a skid shoe; s5, driving the transport ship to the proper sea, aligning the upper upright post with the lower upright post, and slowly lowering and connecting the upper upright post and the lower upright post; s6, cutting off the temporary support tube, lowering the chain to a proper position, welding the support tube at the position of the original temporary support tube, and positioning the wellhead piece at a proper position at the upper end of the oil guide tube; and S7, driving away the transport ship to finish the operation. The invention adopts land integrated construction, finishes prefabrication of wellhead plates on the shore and avoids collision with a transport ship and an oil guide pipe when being installed in place.

Description

Wellhead piece mounting method

Technical Field

The invention relates to the technical field of ocean engineering, in particular to a wellhead piece mounting method.

Background

At present, in offshore oil extraction operation, a block is core equipment of ocean engineering, an integral bearing layer building structure, in the land construction process, a plurality of layers of deck plates are often divided into a plurality of layers according to equipment capacity of a construction site, then the deck plates are hoisted in place layer by layer, the wellhead plates are platform structures of the bottom-most offshore oil extraction operation of the block, the bottom-most offshore oil extraction operation is carried out in a final position and then is level with a christmas tree at the top end of a jacket, and an operation platform is provided for later-stage oilfield operators; because the wellhead sheet consists of a plurality of small-size small-tonnage small deck sheets which are independently placed on a ship, the small deck sheets are assembled and welded through a chain block to complete the assembly work of the wellhead sheet, the process has low construction efficiency on the sea, high operation risk and high potential safety hazard; in addition, because the elevation of the final positioning position of the wellhead piece is lower, the wellhead piece collides with a transport ship and an oil guide pipe when the assembly is loaded and installed in place at sea.

Disclosure of Invention

The invention aims to provide a wellhead piece installation method, which adopts land integrated construction to finish wellhead piece prefabrication on the shore and avoid collision with a transport ship and an oil guide pipe when being installed in place.

In order to achieve the purpose of the invention, the invention provides a wellhead sheet mounting method, which comprises the following steps:

s1, prefabricating wellhead plates and deck plates on land;

s2, enabling the upper upright post to penetrate through the deck plates, and reinforcing the deck plates by tie bars;

s3, a sliding shoe is arranged in the middle of the bottom surface of the bottommost deck plate, wellhead plates are arranged on two sides of the sliding shoe through temporary supporting tubes, and the wellhead plates are connected with the bottommost deck plate through chain links;

s4, placing the support tube on the bottommost armor plate, and moving the whole assembly to a transport ship through a skid shoe;

s5, driving the transport ship to the proper sea, aligning the upper upright post with the lower upright post, and slowly lowering and connecting the upper upright post and the lower upright post;

s6, cutting off the temporary support tube, lowering the chain to a proper position, welding the support tube at the position of the original temporary support tube, and positioning the wellhead piece at a proper position at the upper end of the oil guide tube;

and S7, driving away the transport ship to finish the operation.

As the preferable technical scheme of the invention, the wellhead piece is formed by welding 12 small deck pieces through a chain block.

As a preferable technical scheme of the invention, the diameter of the lower upright post is larger than that of the upper upright post.

As a preferred embodiment of the present invention, the support tube has a length greater than the temporary support tube.

Compared with the prior art, the invention provides a wellhead sheet mounting method, which has the following beneficial effects:

the invention adopts land integrated construction, and the mode of lowering in place after pre-hanging, avoids a great deal of operation of folding the offshore small pieces, reduces the participation of personnel in rivet welding, greatly reduces the construction strength and has higher efficiency; the temporary supporting tube is arranged, so that collision between the inlet piece and the transport ship and between the inlet piece and the oil guide tube in the installation process is prevented, and the safety is higher.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a wellhead plate according to the present invention;

fig. 3 is a schematic diagram of a temporary support tube and support tube of the present invention in comparison.

1 is a sliding shoe, 2 is a wellhead sheet, 3 is a temporary supporting tube, 4 is a armor sheet, 5 is a lacing wire, 6 is an upper upright post, 7 is a sea level, 8 is a transport ship, 9 is a lower upright post, 10 is an oil guide tube, 11 is a supporting tube, 12 is a chain block, and 13 is a armor sheet.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-3, an embodiment of the present invention provides a wellhead plate installation method, which includes the following steps:

s1, prefabricating a wellhead sheet 2 and a deck sheet 4 on land;

s2, enabling the upper upright post 6 to penetrate through the armor plates 4, and reinforcing the armor plates 4 by using lacing wires 5;

s3, a sliding shoe 1 is arranged in the middle of the bottom surface of the bottommost armor plate 4, wellhead plates 2 are arranged on two sides of the sliding shoe through temporary supporting tubes 3, and the wellhead plates 2 are also connected with the bottommost armor plate 4 through a chain 12;

s4, placing the support tube 11 on the bottommost armor plate 4, and moving the whole assembly onto the transport ship 8 through the skid shoes 1;

s5, driving the transport ship 8 to the proper sea, aligning the upper upright post 6 with the lower upright post 9 and slowly lowering and connecting;

s6, cutting off the temporary support tube 3, lowering the chain block 12 to a proper position, welding the support tube 11 at the position of the original temporary support tube 3, and positioning the wellhead piece 2 at a proper position at the upper end of the oil guide tube 10;

and S7, the transport ship 8 is driven away, and the operation is completed.

In one embodiment of the invention, the wellhead plate 2 is formed by welding 12 small deck plates 13 through a chain block.

In one embodiment of the invention, the lower upright 9 has a larger diameter than the upper upright 6.

In one embodiment of the invention, the support tube 11 is longer than the temporary support tube 3.

The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.

Claims

1. A wellhead plate installation method, characterized in that it includes the following steps:

S1. Prefabricate the wellhead piece (2) and deck piece (4) on land;

S2. Pass the upper column (6) through the deck pieces (4), and reinforce the deck pieces (4) with tie bars (5);

S3. Install the sliding shoe (1) in the middle of the bottom of the bottom deck piece (4), and install the wellhead piece (2) through the temporary support pipe (3) on both sides. The wellhead piece (2) and the inverted chain (12) are connected to the bottom deck piece. Deck piece (4) connection;

S4. Place the support tube (11) on the bottom deck piece (4), and move the entire assembly to the transport ship (8) through the sliding shoe (1);

S5. Drive the boat (1) until the sea is suitable, align the upper column (6) with the lower column (9) and slowly lower the connection;

S6. Cut off the temporary support pipe (3), lower the chain (12) to the appropriate position, and weld the support pipe (11) at the position of the original temporary support pipe (3). At this time, the wellhead piece (2) is located at the upper end of the oil guide pipe (10) suitable location;

S7. The transport ship (8) leaves and completes the operation.

2. A wellhead plate installation method according to claim 1, characterized in that:

The wellhead piece (2) is made of 9 small deck pieces (13) welded by a hand chain hoist.

3. A wellhead plate installation method according to claim 1, characterized in that:

The diameter of the lower upright column (9) is larger than that of the upper upright column (6).

4. A wellhead plate installation method according to claim 1, characterized in that it includes:

The length of the support tube (11) is longer than that of the temporary support tube (3).