Summary

A series of core damage experiments was conducted with filtrates containingvarious cement additives, such as dispersants and fluid-loss additives. Resultsclearly show that the extent and location of the permeability impairmentvaries, depending on the relative rate of particle permeability impairmentvaries, depending on the relative rate of particle precipitation and theresidence time in the core. Results of the core-flow, precipitation and theresidence time in the core. Results of the core-flow, experiments areinterpreted in conjunction with particle-size distribution and concentrationresults obtained in batch experiments. Variations in the average particle sizeand the number concentration of particles with time in various compositions ofcement filtrates are reported. These prove to be useful indicators of theextent and location of the damage observed in the cores.