Micro-annulus
Repair by squeezing sealing fluids
Volumes, rates, pressures
Before initiating a squeeze treatment to plug a micro-annulus between the cement sheath and either the casing or formation, it is worth considering what volumes, rates and pressures should be expected from the process, if the sealing fluid is correctly placed into the micro-annulus.
The following is an estimation of the expected values of the treatment parameters based on idealised situations.
Importance for isolation
How large does a micro-annulus have to be to have a significant effect on fluid flow in the annulus?
Some calculations showing the effective permeability of an annulus filled with an impermeable material but with a uniform micro-annulus at the casing surface.
