A device and method for studying the impact on wellbore integrity in the process of geological storage of carbon dioxide

Abstract

The invention provides an experimental device and method for studying the influence on integrity of a shaft in the carbon dioxide geological storage process. According to the experimental device and method, with the help of a supercritical carbon dioxide control pipeline, a liquid carbon dioxide control pipeline, a gaseous carbon dioxide control pipeline and a confining pressure control pipeline, the process that carbon dioxide in a supercritical state, a liquid state and a gaseous state flows through a casing pipe-cement sheath-shaft to influence a casing pipe-cement sheath-shaft assembly can be simulated at the same time.

Description

technical field [0001] The invention belongs to the field of geophysical detection, and relates to an experimental device and method for studying the influence of carbon dioxide geological storage on wellbore integrity, which is suitable for sequentially injecting carbon dioxide in different phases from the bottom of an injection well during the geological storage of carbon dioxide Experimental device and method for studying the influence of casing-cement sheath-wellbore integrity during the process of flowing through the casing-cement sheath-wellbore. Background technique [0002] In the study of geological sequestration of carbon dioxide, technical research on the geological storage of greenhouse gas carbon dioxide is often involved. However, in the process of geological storage of carbon dioxide, there will be the following problems: [0003] 1 After carbon dioxide is injected into the saline layer, the carbon dioxide injection well is shut down for geological sequestrat...

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Problems solved by technology

[0003] 1 After carbon dioxide is injected into the saline layer, the carbon dioxide injection well is shut down for geological sequestration of carbon dioxide, but the cement sheath is damaged due to poor cementing quality in the early development process of the injection well for carbon dioxide sequestration and long-term development, resulting in in-situ stress imbalance , and oil-water interlayer caused wellbore seal failure and other reasons, the carbon dioxide stored will escape into the atmosphere along the gap between the casing and the cement sheath, the cement sheath and the well wall, or along the damaged cement sheath body, making the sequestration fail;

[0004] 2 During the geological storage of carbon dioxide, when the injected carbon dioxide passes through the first cementing surface between the casing and the cement sheath, the second interface between the cement sheath and the wellbore, and the cement sheath body, the first cementing surface and the second interface will occur from time to time. The leaching effect of the interface and the cement sheath body, and when the carbon dioxide is injected into the storage reservoir under what phase conditions, the different phases of carbon dioxide flow through the first cementing surface between the casing and the cement sheath and the interface between the cement sheath and the well wall There is a lack of effective research on the influence of the second cemented surface and the cement sheath body, which makes the risk assessment of carbon dioxide leakage along the wellbore difficult to achieve

However, this invention only proposes a situation of selecting a suitable storage geological layer for geological storage of carbon dioxide, and does not propose the gap between the wellbore and the cement sheath, the damaged cement sheath, and the gap between the cement sheath and the casing during the geological storage of carbon dioxide. For the impact of storage leakage, it does not explain the impact of injecting different phases of carbon dioxide on the integrity of the wellbore

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