Glyco Drill MC product has application in polyglycol systems in fresh-to-medium high salinity make-up water and can be used in wells withmoderate formation temperatures. When used properly, this medium-cloud-point additive helps to stabilize troublesome shales by plugging
shale pores, preventing the equalization of hydrostatic pressure away from the wellbore.
Polyglycol systems are generally low-to-medium density, non-dispersed polymer systems utilizing an electrolyte to activate the cloud pointpolyglycol. They have application where troublesome water-sensitive shales are to be drilled, and can be used in lieu of oil-base systems for certain applications.

Glyco Drill MC  polyglycol can be used in thermally activated mud emulsion (TAME) applications (near the cloud point) or in situations where it is insoluble (above the cloud point).Normal concentrations of Glyco Drill MC  polyglycol range from 2 to 5% by volume of the liquid phase or 7 to 17.5 lb/bbl (20 to 50 kg/m3). After the initial treatment, periodic treatments should be made to maintain the desired concentration. A field test method is available from the Rx Marine International Technical Service Department to monitor the concentration of Glyco Drill MC polyglycol. Above the cloud point,

Glyco Drill MC  polyglycol is insoluble and tends to increase the plastic viscosity (as all insoluble additives do).“Cloud point” is the temperature where polyglycol additives change from being soluble (at lower temperatures) to being insoluble (at higher temperatures). Shale inhibition is improved when the polyglycol is insoluble or “clouded out.” The cloud point temperature can be reduced by increasing salinity (or other electrolytes) and/or by increasing the concentration of Glyco Drill MC .