Method for evaluating stability of salt cavern oil storage

Abstract

The invention relates to a method for evaluating the stability of a salt cavern oil storage. The method comprises the following steps: S1, acquiring the ground stress of a salt rock stratum; S2, acquiring stratum structure parameters; S3, acquiring physical and mechanical parameters of the salt rock; S4, acquiring three-dimensional shape parameters and temperature of the salt cavern oil storage; S5, determining a stability evaluation index; S6, determining the action load of the cavity wall of the salt cavern oil storage tank; S7, establishing a three-dimensional geomechanical model of the salt cavern oil storage depot and performing simulation calculation; and S8, performing on-site monitoring and stability evaluation index calibration. Compared with the prior art, the method has the beneficial effects that the method is suitable for stability evaluation of the salt cavern oil storage; the method is simple in evaluation step, clear in evaluation index and high in operability, quantitative evaluation of the stability of the salt cavern oil storage can be achieved, reasonable operation parameters are optimized to improve the stability of the salt cavern oil storage, and meanwhile reasonable measures can be given according to the stability evaluation result to prevent or eliminate possible instability damage of the salt cavern oil 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 oil storage depot. Background technique [0002] The use of salt caverns for oil storage is one of the main ways to carry out strategic oil reserves in the world. It has the advantages of large storage capacity, low cost, and long-term maintenance of oil quality. Salt cavern oil storage depots for storing oil are relatively large, generally reaching hundreds of thousands or even millions of cubic meters. At the same time, a salt cavern oil storage depot is generally composed of multiple salt caverns, which form an underground system that interacts with each other. Therefore, how to ensure the structural stability of these large underground spaces is very important. Dozens of cases of instability and destruction of salt cavern oil storage have occurred abroad, resulting in huge economic losses and ...

AI Technical Summary

Problems solved by technology

Since there are many types of stability failure of salt cavern oil storage, including ductile failure, brittle failure, casing sealing failure and salt cavern cavity sealing failure (caused by cavity wall instability), these failure characteristics are difficult to use in a single indicators for evaluation

However, the traditional stability evaluation of salt-cavern oil storage is based on a single index, and it has not been able to form a set of evaluation system for the damage characteristics of salt-cavern oil storage.

As a result, the traditional stability evaluation of salt cavern oil storage cannot accurately predict the stability damage of salt cavern oil storage, and cannot optimize the stability control parameters of salt cavern oil storage

[0004] (2) Lack of standardized procedures and procedures for stability evaluation of salt cavern oil storage

[0005] (3) Lack of a list of parameters required in the stability evaluation process of salt cavern oil storage

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

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

[0006] Based on the above reasons, it is urgent to invent a stability evaluation method for salt cavern oil depots to solve the lack of stability evaluation index system, standard process and steps of stability evaluation, and problems in the stability evaluation process of salt cavern oil depots. The problem of requiring a list of parameters provides a technical guarantee for ensuring the safety of salt cavern oil storage in my country

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