Method for releasing blockage of hydrate in oil and gas conveying pipeline

A technology for transporting pipelines and hydrates, which is applied in cleaning methods and appliances, chemical instruments and methods, and cleaning hollow objects, etc. It can solve the problems that have not been well solved, the deep water environment is harsh, and the research and development of related equipment and plugging methods is still in its infancy. stage and other problems, to achieve the effect of simple operation and unblocking

Active Publication Date: 2015-03-11
CHINA NAT OFFSHORE OIL CORP +1
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AI Technical Summary

Problems solved by technology

[0004] At present, although some progress has been made in the research of hydrate plugging removal in foreign countries, due to the harsh deep water environment, this problem has not been well solved, and the research and development of related equipment and plugging removal methods is still in its infancy.

Method used

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  • Method for releasing blockage of hydrate in oil and gas conveying pipeline

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Embodiment 1

[0025] Embodiment 1. Method for removing natural gas hydrate blockage in oil and gas pipelines

[0026] according to figure 1 The flow chart shown is to remove the blockage caused by natural gas hydrate in the oil and gas transmission pipeline.

[0027] During offshore construction, the hydrate control skid is hoisted into the water by the crane on the deck of the construction ship, and released to the vicinity of the pipeline that needs to be unblocked for work. The construction ship is connected to the underwater hydrate control skid through the umbilical cable. The umbilical cable provides 380V power supply, 220V measurement and control system power supply and optical fiber transmission measurement and control signal. The control system is placed on the ship for receiving measurement data and sending operation commands. When receiving When the received temperature and pressure data reach the set value, the corresponding valve can be opened / closed as required. Specific ste...

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Abstract

The invention discloses a method for releasing blockage of hydrate in an oil and gas conveying pipeline. The method comprises the following steps: the two ends of a hydrate blockage segment in the oil and gas conveying pipeline are communicated with a gas and liquid recycling tank through rapid joints, then pressure reduction is carried out on the two ends of the hydrate blockage segment in the oil and gas conveying pipeline, and pressure in the two ends of the hydrate blockage segment is kept balanced; communication between the rapid joints and communication between the gas and liquid recycling tank and the rapid joints are switched off, hydrate inhibitors and/or high-temperature material flows are injected into the hydrate blockage segment, and the hydrate in the oil and gas conveying pipe is decomposed. The method has the beneficial effects that the operation utilizing the hydrate for treating sledging and unblocking is easy, and blockage caused by generation of the solid hydrate in the oil and gas conveying pipeline on the sea can be effectively released; and the independent pressure reduction unblocking method can be adopted, or a pressure reduction and heat agent injecting/injection heat integration unblocking method is adopted, and the method is used for releasing the blockage caused by the solid hydrate in the oil and gas conveying pipeline.

Description

technical field [0001] The invention relates to a method for removing hydrate blockage in oil and gas transmission pipelines, and belongs to the technical field of oil and gas production. Background technique [0002] With the increasing depth of offshore oil and gas field development, the laying depth and length of submarine pipelines are also increasing. The harsh natural environment in deep water not only imposes strict requirements on deep-water floating platforms, underwater production systems, and offshore operations, but also imposes severe requirements on the operation and work of satellite wells, marginal oil fields, and central processing systems connected thereto. Kilometers, dozens of kilometers or even hundreds of kilometers of submarine pipelines have brought severe tests. The data from the oil field show that: due to the low temperature environment in deep water, solid hydrates are easily formed in deep water oil and gas mixed transportation pipelines, causin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/027
CPCB08B9/027B08B2209/027
Inventor 庞维新李清平姚海元朱海山王炳明陈艳程兵陈绍凯
Owner CHINA NAT OFFSHORE OIL CORP
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