A hydrate secondary generation prevention system and method for combustible ice collection pipeline

By combining a liquid-phase pipeline hydrate control system and an underwater hydrate inhibitor injection system with pressure and component control, the problem of secondary hydrate formation during combustible ice mining has been solved, achieving safe and efficient transportation.

CN117703340BActive Publication Date: 2026-08-25CHINA PETROLEUM ENG & CONSTR +1
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Patent Information

Application Number
CN202211108598.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-13
Publication Date
2026-08-25
Estimated Expiration
2042-09-13

AI Technical Summary

Technical Problem

During the extraction of combustible ice, the secondary formation of hydrates affects the safety and efficiency of the transportation system, and existing technologies lack effective prevention and control measures.

Method used

A liquid-phase pipeline hydrate control system is used for gas-liquid separation. Periodic exhaust valves and an underwater hydrate inhibitor injection system are installed. Combined with pressure control and component control, a multi-dimensional prevention and control system is formed to prevent the secondary formation of hydrates.

Benefits of technology

This effectively reduces the risk of secondary hydrate formation in the liquid phase pipeline, improves the transport efficiency of the gas phase pipeline, reduces the amount of hydrate inhibitors used, and ensures the safe and efficient operation of the acquisition system.

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Abstract

The application discloses a hydrate secondary generation prevention and treatment system and method for combustible ice collection pipeline, which comprises a gas phase collection pipeline for conveying output gas phase medium and a liquid phase collection pipeline for conveying output liquid phase medium, the liquid phase collection pipeline is connected with a liquid phase pipeline hydrate control system for separating free gas of wellhead liquid phase produced medium. Based on the theory of sea area combustible ice mining, the application conforms to the depressurization mining mode, aims at the medium characteristics of the gas phase channel and the liquid phase channel output during the underground decomposition, combines the pressure and temperature conditions under the deep water development environment, evaluates and obtains the viewpoint that the hydrate secondary generation risk of the gas phase medium collection pipeline is smaller under the basic maintenance of 3MPa operating pressure, and the liquid phase medium collection pipeline is mainly prevented from the hydrate secondary generation, and the gas-liquid secondary separation scheme is provided to prevent the hydrate secondary generation of the liquid phase medium collection pipeline from the components.
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