| 摘要 |
<p>INVENTOR Robert E, Slinqerland 6311 Beverly Hill, #65 Houston, Texas 77057 TITLE: WATER-BASED DRILLING FLUIDS HAVING ENHANCED FLUID LOSS CONTROL A water based drilling fluid and process for using the same comprising a mixture of water and a polymer complex, wherein the polymer complex is the reaction product of a dispersant selected from the group consisting of lignite, sulfonated lignite, lignosulfonate, and sulfoalkylated lignite, and salts thereof and a water-soluble sulfonated polystyrene havinq a molecular weight of at least 70,000 and containing 0.7 to 2.0 sulfonic acid groups per styrene unit.</p> |
