A gas injection and brine discharge device and method for a salt cavern gas storage

Abstract

The invention relates to a gas injection and brine discharge device for a salt cavern gas storage, comprising: a casing, an inner tube for gas injection and brine discharge, and an outer tube for gas injection and brine discharge; the outer tube for gas injection and brine discharge is lowered into the upper part of the salt cavern through the casing , the outer pipe for gas injection and brine removal is connected to the lower part of the casing through a packer, and the annular space between the casing on the upper part of the packer and the outer pipe for gas injection and brine removal is filled with annulus protection fluid. The method of gas injection and brine removal includes the following steps: sonar measurement of the cavity, lowering the drill pipe to explore the bottom, acquisition of physical parameters of the sediment at the bottom of the cavity, determination of the size and rate of the gas injection and brine removal inner pipe, and the insoluble matter near the mouth of the gas injection and brine removal inner pipe. The force analysis of the sediment particles, the nozzle depth of the nozzle of the inner gas injection and halogen removal pipe and the outer nozzle of the gas injection and halogen removal pipe are determined, and the outer and inner pipes of the gas injection and halogen removal are lowered, and the gas injection and halogen removal are carried out. Compared with the prior art, the present invention is applicable to brine discharge in salt cavern gas storage, salt cavern hydrogen storage, salt cavern compressed air energy storage and salt cavern oil storage; the steps are simple, the parameters are clear, and the operability is strong, which can realize the Accurate control of gas injection and brine discharge for 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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