| 摘要 |
<p>METHODS AND COMPOSITIONS UTILIZING A DRILLING FLUID COMPRISING SUB-MICRON PRECIPITATED BARITE HAVING A WEIGHT AVERAGE PARTICLE DIAMETER BELOW ABOUT 1 MICRON. METHODS INCLUDE A METHOD COMPRISING CIRCULATING A DRILLING FLUID IN A WELL BORE, WHEREIN THE DRILLING FLUID COMPRISES: A CARRIER FLUID; AND A WEIGHTING AGENT THAT COMPRISES SUB-MICRON PRECIPITATED BARITE HAVING A WEIGHT AVERAGE PARTICLE DIAMETER BELOW ABOUT 1 MICRON ARE DISCLOSED. IN SOME EMBODIMENTS, THE DRILLING FLUID MAY COMPRISE AN INVERT EMULSION. IN SOME EMBODIMENTS, THE SUB-MICRON PRECIPITATED BARITE HAS A PARTICLE SIZE DISTRIBUTION SUCH THAT AT LEAST 10% OF PARTICLES IN THE SUB-MICRON PRECIPITATED BARITE HAVE A DIAMETER BELOW ABOUT 0.2 MICRON, AT LEAST 50% OF THE PARTICLES IN THE SUB-MICRON PRECIPITATED BARITE HAVE A DIAMETER BELOW ABOUT 0.3 MICRON AND AT LEAST 90% OF THE PARTICLES IN THE SUB-MICRON PRECIPITATED BARITE HAVE A DIAMETER BELOW ABOUT 0.5 MICRON.</p> |
