Salt cavern gas storage stability evaluating method

Abstract

The invention belongs to the field of oil and gas resources development, and particularly relates to a salt cavern gas storage stability evaluating method. The salt cavern gas storage stability evaluating method includes the following steps that S1, in-situ stress of a salt rock formation is acquired; S2, formation structural parameters are acquired; S3, salt rock physical and mechanical parameters are acquired; S4, three-dimensional shape parameters and temperature of a salt cavern gas storage are acquired; S5, stability evaluating indexes are determined; S6, a salt cavern gas storage three-dimensional geomechanical model is established and simulating calculation is carried out; and S7, a site is monitored and the stability evaluating indexes are calibrated. Compared with the prior art, the salt cavern gas storage stability evaluating method has the following beneficial effects that the method is suitable for salt cavern gas storage stability evaluation; the evaluating steps are simple, the evaluation indexes are clear, and operability is high; and quantitative evaluation of salt cavern gas storage stability can be realized, reasonable operation parameters are optimized to improvethe salt cavern stability, and meanwhile, according to stability evaluating results, reasonable measures are given to prevent possible instability failure of the salt cavern gas storage.

Description

technical field [0001] The invention belongs to the field of oil and gas resource development, and in particular relates to a method for evaluating the stability of a salt cavern gas storage. Background technique [0002] The use of salt caverns to store oil, natural gas, and compressed air has become a common energy storage method in the world, and it has to be widely promoted and applied in my country. The volume of salt caverns used for oil and natural gas storage can generally reach hundreds of thousands or even millions of cubic meters, so how to ensure its stability is very important. Dozens of cases of salt cavern instability and destruction have occurred abroad, causing huge losses. Since the salt cavern exhibits typical brittle failure (block drop, lamina, cracking) and plastic failure (volume shrinkage, cavity bottom uplift, and large deformation of the cavity wall) characteristics during the instability failure process, it is possible to accurately predict the sa...

AI Technical Summary

Problems solved by technology

For example, for the same salt cavern gas storage, the evaluation results obtained by different evaluators may be different, and even the conclusions are completely opposite

[0004] (2) Lack of a list of parameters required in the stability evaluation process

If a detailed and accurate parameter list cannot be given before the stability evaluation of the salt-cavern gas storage, it will seriously affect and delay the development of the stability evaluation of the salt-cavern gas storage

At present, there is no list of relevant parameters that can be used for reference.

[0005] (3) Lack of stability evaluation index system

This makes the traditional stability evaluation index system unable to accurately predict the stability failure of the salt-cavern gas storage, and cannot optimize the stability control parameters of the salt-cavern gas storage.

[0006] Based on the above reasons, it is urgent to invent a method for evaluating the stability of salt-cavern gas storage, so as to solve the lack of standardized procedures and procedures for stability evaluation and the lack of a list of parameters required in the process of stability evaluation in the current stability evaluation process of salt-cavern gas storage. and lack of stability evaluation index system, providing technical guarantee for ensuring the safety of salt cavern gas storage in my country

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