| 摘要 |
<p>A water base drilling fluid having enhanced lubricating properties in the presence of polyvalent cations comprising a mixture of 1) water; 2) finely divided inorganic solids;3) an alkanolamide of a saturated fatty acid having 8 to 20 carbon atoms, or triglycerides thereof, and 4) an alkanolamide of an unsaturated fatty acid having 18 carbon atoms, or triglycerides thereof.</p> |
