Gas injection and brine discharge device and method for salt-cavern gas storage

Abstract

The invention relates to a gas injection and brine discharge device for a salt-cavern gas storage. The gas injection and brine discharge device comprises a sleeve pipe, a gas injection and brine discharge inner pipe and a gas injection and brine discharge outer pipe; the gas injection and brine discharge outer pipe is tripped into the upper portion of a salt cavern through the sleeve pipe, the gasinjection and brine discharge outer pipe is connected with the lower portion of the sleeve pipe through a packer, and an annular space between the sleeve pipe on the upper portion of the packer and the gas injection and brine discharge outer pipe is filled with annular protection liquid. The gas injection and brine discharge method comprises the following steps of sonar cavity measurement, bottomdetection of a lower drill rod, acquisition of cavity bottom sediment physical property parameters, determination of the size and brine discharge rate of the gas injection and brine discharge inner pipe, stress analysis of insoluble matter sediment particles near a pipe opening of the gas injection and brine discharge inner pipe, determination of the downward depth of the pipe opening of the gasinjection and brine discharge inner pipe and a pipe opening of the gas injection and brine discharge outer pipe, tripping of the gas injection and brine discharge outer pipe and the gas injection andbrine discharge inner pipe, and gas injection and brine discharge. Compared with the prior art, the gas injection and brine discharge device is suitable for brine discharging of the salt-cavern gas storage, a salt-cavern hydrogen storage, a salt-cavern compressed-gas energy storage and a salt-cavern oil storage; and the method has the advantages of simple steps, clear parameters and high operability, and can realize accurate control of gas injection and brine discharge of the salt-cavern gas storage.

Description

technical field [0001] The invention belongs to the field of oil and gas resources development, and in particular relates to a gas injection and brine discharge device and method for a salt cavern gas storage. Background technique [0002] As an important part of my country's gas storage, salt cavern gas storage has been constructed in Jintan, Jiangsu, Huai'an, Jiangsu, Pingdingshan, Henan, and Qianjiang, Hubei. Gas injection and brine removal is an important step in the construction of salt cavern gas storage. It is through the completion casing that the outer pipe for gas injection and brine removal is first inserted to the top of the salt cavern cavity, and then injected into the outer pipe for gas injection and brine removal. The inner pipe of the gas exhaust halogen reaches the design depth of the bottom of the cavity. Natural gas is injected into the salt cavern through the annular space between the gas injection and brine discharge outer pipe and the gas injection an...

AI Technical Summary

Problems solved by technology

Due to the lack of scientific, reasonable and clear steps, the optimization of the distance between the nozzle of the gas injection and brine exhaust inner pipe and the insoluble sediment surface at the bottom of the cavity has stagnated

Second, there is no clear conclusion on whether the empirical value of the Jintan salt cavern gas storage is applicable to other salt cavern gas storages (such as Huaian in Jiangsu, Pingdingshan in Henan and Qianjiang in Hubei).

Third, there is no practical method for determining the distance between the nozzle of the gas injection and brine discharge inner pipe and the insoluble sediment surface at the bottom of the cavity for the newly built salt cavern gas storage

Fourth, when determining the depth of the top surface of insoluble matter and sediment at the bottom of the salt cavern, the parameters are not clear, and there are two situations based on the data of the sonar cavity measurement and the bottoming out of the drill pipe, resulting in poor field operability

[0003] Based on the above reasons, it is urgent to invent a method of gas injection and brine discharge for salt cavern gas storage, which can solve the problems of lack of standardized procedures, unclear steps and parameters during gas injection and brine discharge of salt cavern gas storage, and provide a new method for salt cavern gas storage in my country. Efficient and safe implementation of gas injection and brine discharge provides technical support

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