Device and method for monitoring leakage of carbon dioxide geological storage cap layer

Abstract

The invention particularly relates to a device and a method for monitoring leakage of a carbon dioxide geological storage cap layer. The device for monitoring leakage of the carbon dioxide geologicalstorage cap layer comprises a monitoring well, a carbon dioxide gas capturing device and an isotope mass spectrum analyzer, wherein a gas collecting port is formed in a well mouth of the monitoring well; the monitoring well is positioned in a main stress concentration area of the cap layer, a reservoir fracture development area, a high point position of a geological structure and a well site wherea gas injection well is positioned; the carbon dioxide gas capturing device is connected with the gas collecting port and is used for capturing carbon dioxide gas collected by the gas collecting port; and the isotope mass spectrum analyzer is used for analyzing contents of carbon isotopes 13C and 12C in the carbon dioxide captured by the gas collecting port without gas injection and after gas injection. According to the device and the method, the sign that the carbon dioxide breaks through the cap layer and leaks upwards can be accurately, timely and effectively found, possible leakage pathsof the carbon dioxide in the reservoir are monitored, and safety early warning is given when the carbon dioxide does not leak to the shallow earth surface.

Description

technical field [0001] The invention relates to a carbon dioxide leakage monitoring method, in particular to a carbon dioxide geological storage cover layer leakage monitoring device and method. Background technique [0002] Under the background of global climate change, carbon dioxide geological storage and ocean storage are currently the most potential emission reduction measures. Canada's Weyburn, Norway's North Sea Sleipner oilfield, and Algeria's InSalah operate the world's three major CO2 storage projects. Domestic PetroChina, Sinopec, Shenhua Group, Huaneng Group, and Yanchang Petroleum Group have also launched relatively large-scale CCS demonstration projects. [0003] After being geologically stored, carbon dioxide may break through the capillary force and leak to the shallow surface, or it may migrate to the shallow surface through faults and fault zones. In addition, the wall of the injection well and the wall of the monitoring well may also become the way of di...

AI Technical Summary

Problems solved by technology

Considering the safety of storage, the diffusion of carbon dioxide in the horizontal direction causes the gas front to protrude, while the migration in the vertical direction has a greater safety hazard

The greater the upward migration distance of carbon dioxide, the lower the safety of carbon dioxide storage, and the probability of leakage when the migration breaks through the cap layer is greatly enhanced

However, these huge-investment technologies are suitable for large-scale, large-scale, three-dimensional long-term monitoring and strategic research. It is necessary to study an economical and time-effective carbon dioxide geological storage leakage monitoring method for areas with small areas and small storage volumes.

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