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A method for automatic pigging of deep water underwater pipelines

A technology for underwater pipelines and pigging, which is applied in cleaning methods and tools, chemical instruments and methods, and earthwork drilling and production, and can solve problems such as oil and gas field shutdown, oil and gas field production impact, and high cost

Active Publication Date: 2021-04-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Claims
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Problems solved by technology

The pigging method has a long operation period and high cost, and oil and gas fields generally need to stop production, which will have a great impact on the production of oil and gas fields

Method used

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  • A method for automatic pigging of deep water underwater pipelines
  • A method for automatic pigging of deep water underwater pipelines

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Embodiment Construction

[0014] In the description of the present invention, it should be understood that the terms "first", "second", "third" and so on are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] The invention provides an automatic pigging method for a deep-water underwater pipeline. The method is to place an underwater pigging ball in the underwater pipeline, and the underwater pigging ball will automatically move forward along the pipeline under the action of the pressure difference between the front and rear ends. In order to achieve the purpose of cleaning residual substances and wax deposits in the pipeline. In this pigging method, an underwater pigging device is preset at the terminal of the underwater pipeline, and an underwater pigging ball is pre-embedded in the underwater pigging device, and mu...

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Abstract

The invention relates to an automatic pigging method for a deep-water underwater pipeline. The steps include: carrying out the pigging operation according to a preset underwater pigging device: an underwater pigging ball is preset in the underwater pigging device, Under the action of the pressure difference between the front and rear sides of the pigging ball, it moves along the pipeline by itself to realize the cleaning operation of the pipeline; after the pigging operation is completed, the normal production operation resumes. The present invention only needs a single pipeline between the main platform and the oil field, and adopts a one-way pigging system to replace the loop pigging system, so that the offshore oil and gas fields in deep and far seas can be developed more economically and effectively. Moreover, the residue in the pipeline will not move to the wellhead and will not pass through the underwater production equipment, so the oil and gas field does not need to stop production, significantly reducing the cost of pigging operations in the oil and gas field, and the impact on the production of the oil and gas field will be minimized.

Description

technical field [0001] The invention relates to the technical field of underwater oil and gas production systems, in particular to an automatic pigging method for deepwater underwater pipelines. Background technique [0002] With the rapid growth of the world's offshore oil and gas industry, more and more attention will be paid to the development of marginal oil fields. Due to their small oil reservoir content, it will not be economical to develop them alone. Therefore, their oil and gas products are usually transported to existing The processing is carried out on the facility, and the transportation distance can sometimes reach thousands or even tens of thousands of meters. Flow assurance problems in these pipelines mainly include hydrate formation, clogging, paraffin deposition, bitumen precipitation and scaling. The treatment methods to eliminate these effects mainly include: regular and irregular pigging, injection of chemical agents through control cables and electric ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B9/055E21B37/00
CPCB08B9/0552E21B37/00
Inventor 李博王春升朱军龙郭江艳
Owner CHINA NAT OFFSHORE OIL CORP
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