A Comprehensive Evaluation Index System and Design Method for Gas Production Rate of Salt Cavern Gas Storage

Abstract

The invention discloses a comprehensive evaluation index system and design method for the gas production rate of a salt-cavern gas storage, which includes dividing the salt-cavern gas storage from bottom to top into a cavity part, a pipe string system part, and a wellhead station part, respectively. The factors affecting the gas recovery rate of the gas storage are comprehensively studied from these three aspects: ①cavity stability and volume shrinkage, ②pipe string erosion corrosion and vibration, ③hydrate and condensate water formation; The method for determining the gas recovery rate of adverse effects, taking the minimum value under each constraint factor as the maximum gas recovery rate of the gas storage, so as to ensure economic benefits or increase the gas recovery rate as much as possible according to the operational requirements of the gas storage, and to have emergency response To allocate the gas recovery rate plan for the entire service life of the gas storage. The factors studied by the present invention are very comprehensive, basically including all the composition structures and types of salt-cavern gas storages that can be seen at present, and all possible stability and safety problems related to the gas production rate of gas storages that may be encountered.

Description

technical field [0001] The invention belongs to the technical field of salt cavern gas storage, and specifically relates to a comprehensive evaluation index system and design method for the gas recovery rate of salt cavern gas storage, which is suitable for determining underground gas storage such as natural gas storage, compressed air energy storage, hydrogen storage, etc. gas production rate parameters. Background technique [0002] Salt caverns are underground storage facilities formed in deep salt mines in a water-soluble manner. They have good airtightness, stable chemical properties, and good damage self-healing capabilities. They are internationally recognized as ideal places for oil and gas storage and industrial waste disposal. At present, there are more than 1,500 salt caverns used to store various substances in the world. There are 107 salt cavern gas storages in service, mainly distributed in developed regions such as the United States, Canada, and Europe, with a...

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Problems solved by technology

[0004] However, with the deepening of engineering practice and understanding of the operation technology of salt-cavern gas storages, it is found that gas storages with different gas production rates have great differences in terms of stability, working gas volume, service safety and service life and peak-shaving performance.

It is manifested in: the working gas volume produced by high-intensity gas production is hundreds of thousands or even millions of cubic meters less than that of low-intensity gas production; the gas storage of high-intensity gas production is prone to instability and cracks under the conditions of rapidly changing temperature and internal pressure and other issues; the low gas recovery rate cannot give full play to the advantages of quick response of salt-cavern gas storage compared with other types of storage, and there are also uneconomical disadvantages

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