Mechanical Integrity Testing
for Underground Caverns
An MIT is commonly performed to evaluate the mechanical integrity of a cavern’s wellhead, casing, tubing, and cemented annulus between the production casing and the formation at the casing seat area. Generally, the test is conducted by injecting nitrogen into the well to below the casing seat at the desired test pressure. Brine and nitrogen pressures are recorded, and the interface level is located by running an interface detection tool. This interface will be used to calculate and evaluate the well/cavern integrity.
BGES has developed a proprietary Gamma-Density Interface Tool, GDI-2, (patent pending) capable of detecting fluid interfaces behind 1 or 2 sets of casings. It is specifically designed to detect various types of gas-liquid and liquid-liquid interface in salt caverns. The tool has a vertical resolution of up to 2” (or 5cm), and is approved by the CNSC with no well abandonment requirements if it becomes unrecoverable in a well / cavern.
For more information, please click here to view our interface detection tool page.