Specialty Oil Field Additives| GCW 1 | Liquid silicate cement/mud pre-flush removes mud by turbulent action and chemical reaction. |
| GCW 2 | SAPP, chemical wash for water-based muds; removes mud by turbulent action and chemical reaction. |
| GCW 3 | Selected chemical wash concentrate; effective at all temperatures, water wetting, normal concentration is 1 gal/barrel mix water. |
| GCW 3F | Selected blend of chemical wash concentrate and oil-soluble fluid-loss additive; removes mud by turbulent action and chemical reaction; components mixed with water on location. |
| GCW 4 | Chemical wash for oil-based drilling muds; removes mud by turbulent action and chemical reaction; extreme wetting ability and effective at all temperatures. |
| GEM 1 | Emulsifier/water wetting surfactant; used to make oil-in-water (outside phase) emulsion spacer; displaces weighted drilling muds in plug or turbulent flow; can be weighted to 17.0 lb./gal. |
| GOS 50 | Spacer GWS-50 plus water-wetting surfactant, displaces weighted drilling muds in plug or turbulent flow; effective at all temperatures; normal surfactant concentration is 2 to 4 gal/barrel. |
| GWS 50 | Spacer concentration; displaces weighted drilling muds in plug or turbulent flow, effective at all temperatures; weighted with barite, silica, ilmenite, or hematite up to 18.0 lbs/gal; normal concentration is 50 lbs/barrel of mix water. |