Abstract
Oxidized matters, produced in the laboratory reacting lignite with dil-HNO3, are discussed as thinners and emulsifiers for drilling fluids.
Changes of reaction conditions, especially in concentration of HNO3, were examined on their effective behavior in drilling fluids.
Some essential parts for adjusting drilling fluids are detected in our oxidized lignites.
Those parts which can be extracted by alkalis from differently processed oxidized lignites give equal behaviors in drilling fluids.
