CMHEC is a good mud slurry treatment
reagent for well drilling and can be used as material for well completion
liquid. It has high rate of slurry making and excellent properties
in increasing viscosity and high temperature tolerance. It is suitable
for making fresh water, seawater and saturated brine well completion
liquid with different densities, while maintaining lower fluid loss.
When compared with Polyanionic Cellulose
(PAC), CMHEC gives better performance in handling saturated brine
mud slurry and has higher calcium resistance in seawater mud slurry.
It also has better viscosity building capability and lower fluid
loss in making well completion fluid when comparing with regular