Recovery Method of Abandoned Deepwater Pipeline
A recycling method and deep-water technology, applied in the direction of pipes/pipe joints/fittings, pipeline laying and maintenance, machinery and equipment, etc., can solve the problems of difficult and time-consuming connection of recycled steel cables and recycling heads, and achieve convenient and fast recycling, saving marine life. The effect of construction time and depth of operating waters
Active Publication Date: 2016-08-24
CHINA NAT OFFSHORE OIL CORP +1
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide a method for recovering abandoned deep-water pipelines. It is difficult and time-consuming to recover the connection of the head; moreover, by using the underwater robot to recover the pipeline, it solves the restrictions on divers in the deep water area, making the recovery of the deep water pipeline more convenient and faster, and the operating water area of the pipeline recovery is deeper; at the same time, it saves a lot Construction time, providing technical support for the development of deep water oil and gas fields
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0037] Such as figure 1 — Figure 6 As shown, the following steps are used when discarding the tube:
[0038] The first step, the preparation work before the recovery of abandoned pipes in deep water:
[0039] 1. Before recycling the abandoned pipe in deep water, first of all, it is necessary to calculate and analyze the recovery of the abandoned pipe in deep water;
[0040] 1. According to the parameters of the submarine pipeline, the laying tension, the position height of the ship's operation line roller and the relevant sea state parameters, the laying tension level of the deep-water abandoned pipe head 6 on the ship and at different water depths, and the abandoned pipe recovery steel cable 1 are calculated by computer. put the length;
[0041] 2. According to the range of the radius of curvature of the deepwater stinger 10, the computer calculates the appropriate radius of curvature of the stinger 10, the tension of the recovery steel cable 1 when the discarded pipe is ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a recovery method of an abandoned deepwater pipeline. The recovery method comprises the following steps that firstly, preparations are made for recovery of the abandoned deepwater pipeline; secondly, recovery tools are connected; thirdly, a boat is moved, and the pipeline is conveyed to the stern; fourthly, tension is transferred to an abandoned pipeline recovery steel cable; fifthly, the cable continues to be paid off, and the boat is moved to in the nose direction; sixthly, the cable continues to be paid off, the pipeline laying boat is moved in the nose direction, and the pipeline is lowered to the seabed; seventhly, the steel cable is recovered, and the abandoned pipeline recovery tools are kept vertical; eighthly, unhooking is performed, and the steel cable is recovered; ninthly, preparations are made for recovering the pipeline; tenthly, the pipeline is recovered in the reverse process of pipeline abandoning. By means of the recovery method, the deepwater pipeline is recovered more conveniently and rapidly; an underwater robot is used for recovering the pipeline, so that the limitation on divers from deepwater areas is released, and the depth of water areas where pipeline recovery is performed is larger; on-sea construction time is greatly shortened, and technical guarantees are provided for development of deepwater oil-gas fields.
Description
technical field [0001] The invention relates to a method for recovering abandoned pipes, in particular to a method for recovering abandoned pipes of deep-water pipelines suitable for laying deep-water submarine pipelines. It belongs to the field of offshore oil engineering. Background technique [0002] As the laying of submarine pipelines gradually moves towards deep water, the projects of laying deepwater submarine pipelines are increasing year by year, and many oil and gas field production blocks have reached the kilometer level. [0003] During the normal laying of deep-water submarine pipelines, when the laying operation has to be terminated due to bad weather or other reasons, it is necessary to abandon the pipeline. And when the weather improves and the conditions for continuing the pipelaying operation are met, the pipelaying ship will be repositioned to recover the pipeline and restart the pipelaying operation. [0004] At present, the recovery of abandoned pipeli...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F16L1/12
CPCF16L1/166
Inventor 燕晖陈永訢李建楠李斌朱绍华邢厚宽孟祥伟周楠吴业卫牛强
Owner CHINA NAT OFFSHORE OIL CORP