Underground storage cavern wellbore string corrosion experimental device and experimental method

Abstract

The invention relates to an underground storage cavern wellbore string corrosion experimental device and experimental method, wherein the experimental device comprises a dynamic test kettle body, a medium injection device, a temperature control device and a data acquisition device. The dynamic test kettle body is provided with a first closed space, a first medium injection hole and a rotating device, and the first closed space is internally provided with a test sample pendant and is full of a corrosive medium; the rotating device makes a relative motion formed between the corrosive medium in the first closed space and the test sample pendant in the first closed space. The medium injection device makes the corrosive medium injected into the first closed space and maintains a certain constant pressure. The temperature control device heats the first closed space and remains at a certain constant temperature. The data acquisition device comprises a pressure sensor and a computer, wherein the computer is connected with the pressure sensor, the temperature control device and the rotating device and is used for acquisition of data of the pressure, the temperature and the rotation speed. The experimental device can simulate test and evaluation of wellbore corrosion under the environments of high temperature, high pressure and dynamic and static corrosive media.

Description

technical field [0001] The invention relates to the engineering technical field of an underground gas / oil storage, in particular to an experimental device and an experimental method for simulating the construction and operation of the underground gas / oil storage, testing and evaluating the corrosion of a wellbore pipe string. Background technique [0002] During the operation of the natural gas underground storage, the storage medium natural gas contains carbon dioxide and other acid gases, which are corrosive to the storage wellbore string, reduce the strength of the string, affect the gas tightness, and reduce the service life of the string. During the process of gas injection and brine discharge and cavity construction in the salt cavern gas storage / oil depot, the brine will corrode the brine discharge pipe and the cavity construction string, affecting the strength and air tightness of the pipe string. At present, the phenomenon of annular pressure in the underground natu...

AI Technical Summary

Problems solved by technology

There are many studies on the corrosion of wellbore strings in oil and gas fields, but there are few experimental studies on the corrosion of wellbore strings in natural gas underground storage by carbon dioxide and the corrosion of brine on cavity building strings and gas injection and brine discharge strings.

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