The invention relates to an oil / gas well
cement sheath sealing
integrity testing device. The testing device comprises a pressure kettle and a
simulation wellbore located in the pressure kettle. The testing device further comprises a
pressure control system, a
temperature control system, a fluid channeling detection
system, a strain measuring system and a mud cake
simulation system. The
simulation wellbore comprises a casing
pipe and a core located on the periphery of the casing
pipe. An annular gap is formed between the sleeve and the core, and a
cement sheath is formed in the annular gap. The upper ends and the lower ends of the casing
pipe and the core are provided with an upper end cover and a lower end cover respectively. The temperature borne by the
cement sheath under different downhole working conditions and complex loads from the casing pipe and a stratum can be truly simulated, and the process range covers well cementation at the oil / gas
well drilling and completion stage and pressure tests, producing tests, circulating injection production, fracturing and other improvement working conditions in the production process. The influence rule of the
cement sheath sealing integrity can be evaluated by changing the thickness of the
cement sheath, the character of mud cakes, the maintenance temperature and other factors.