| abstract |
Organophilic polyphenolic materials, used effectively as fluid loss control additives when working with oil-based drilling fluids, are prepared from a polyphenolic material and one or more phosphatides. The preferred phosphatides are phosphoglycerides obtained from vegetable oils, such as preferably commercial lecithin. Preferred polyphenolic materials include one or more compounds of humic acid, lignosulfonic acid, lignins of phenolic condensates, tannins as well as the oxidized, sulfonated or sulfomethylated derivatives of these polyphenolic materials and the water-soluble or dispersible salts. colloidal of these polyphenolic materials or derivatives of these materials. |