Method and device for detecting completeness of well cementation two interfaces of carbon dioxide injection well

The invention discloses an integrity detection method and device for a well cementation two-interface of a carbon dioxide injection well, and belongs to the field of well cementation engineering. According to the method, whether the well cementation interface is cracked or not is judged by obtaining shear stress generated by the well cementation interface of the carbon dioxide injection well under the chemical and mechanical coupling effect; in response to cracking of the well cementation interface, the failure length of the well cementation interface is calculated according to the energy conservation principle, and the integrity of the well cementation interface is judged with the failure length as a calculation index. According to the method, the influence of the change of the stratum stress-strain state under the chemical-mechanical coupling effect after carbon dioxide injection on the well cementation two-interface is considered, the failure process of the well cementation two-interface in the carbon diox