DRILLING FLUID ADDITIVES FOR IMPROVED SHALE STABILIZATION, THE DRILLING FLUID FORMED THEREFROM AND METHOD OF USING SAME

摘要

A drilling fluid additive for use with water sensitive shales, clay or fines is presented which comprises a water soluble polymer, such as for example, polyvinylpyrrolidone, polyvinylalcohol, polysaccharides, or partially hydrolyzed polyacrylamide in combination with a sulphosuccinate surfactant, an acetylenic alcohol surfactant or a surfactant made from the sodium salts of sulfonated naphthalene-formaldehyde condensates.