Determination method for risk of storage medium leakage of underground natural gas storage reservoir

Abstract

The invention provides a determination method for risk of storage medium leakage of an underground natural gas storage reservoir. The method is used for determining the risk of storage medium leakage of the underground natural gas storage reservoir based on a fuzzy fault tree so as to judge the possibility of leakage failure of the underground natural gas storage reservoir. In the method, the fault tree for the storage medium leakage from a salt cavern underground natural gas storage reservoir to the outside atmospheric environment is established, the probability of basic event causing the storage medium leakage to the outside atmospheric environment is determined by a historical data statistical method and an established engineering evaluation model, influence of various risk factors on the probability of basic event is introduced into the calculation of the probability of basic event in the form of correction factors, and simultaneously, according to the principle of controlling the leakage mode by a main event, and the fault tree logic, the determination methods for the risk of small-leakage mode, big-leakage mode and cracking mode storage medium leakage of the salt cavern underground natural gas storage reservoirs are established.

Description

technical field [0001] The invention relates to a method for measuring the leakage risk of a storage medium in an underground gas storage, in particular to a method for measuring the leakage risk of a storage medium in a cave-type natural gas underground gas storage based on a fault tree. Background technique [0002] At present, my country has planned to build a number of salt cavern-type natural gas underground gas storages. The Jintan Gas Storage, a supporting project of the West-to-East Gas Transmission Line under construction, has five old cavities in the injection-production operation stage. During the "Twelfth Five-Year Plan" period It will reach the scale of 62 single cavities; projects such as Pingdingshan in Henan and Yunying salt cavern gas storage in Hubei will also be constructed during the "Twelfth Five-Year Plan" period. How to take effective measures to reduce the impact of various harmful factors on the safety of underground gas storage, avoid underground gas...

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Problems solved by technology

[0005] The present invention aims to provide a method for measuring the leakage risk of the storage medium of the salt cavern type natural gas underground gas storage, which is used to judge the possibility of leakage failure of the underground gas storage, and provides failure probability data for the risk assessment of the salt cavern type underground gas storage , the present invention can solve the problem of failure probability calculation in risk assessment of salt cavern underground gas storage, and provide technical means for preventing leakage accidents of salt cavern underground gas storage, thereby ensuring safe and stable operation of salt cavern underground gas storage

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