Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7977281 | Methods for minimizing the amount of graphite particles used during drilling operations | David Schwertner, S. Dwight Strickland | 2011-07-12 |
| 7393813 | Water-based drilling fluids using latex additives | David Schwertner, Tao Xiang, Dennis K. Clapper | 2008-07-01 |
| 7271131 | Fluid loss control and sealing agent for drilling depleted sand formations | David Schwertner, Tao Xiang, Dennis K. Clapper | 2007-09-18 |
| 7087555 | Drilling fluids comprising sized graphite particles | David Schwertner, S. Dwight Strickland | 2006-08-08 |
| 6790812 | Acid soluble, high fluid loss pill for lost circulation | Dennis K. Clapper, Michael A. Jarrett, Michelle Carr | 2004-09-14 |
| 6635604 | Low molecular weight water soluble organic compounds as crystallization point suppressants in brines | Dennis K. Clapper | 2003-10-21 |
| 6165945 | Blends of glycol derivatives as gas hydrate inhibitors in water base drilling, drill-in, and completion fluids | Dennis K. Clapper, Mark R. Smalling, Ronald G. Bland | 2000-12-26 |
| 6080704 | Glycols as gas hydrate inhibitors in drilling, drill-in, and completion fluids | Dennis K. Clapper, Mark R. Smalling | 2000-06-27 |
| 5851958 | Olefins and lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids | David Schwertner | 1998-12-22 |
| 5837655 | Purified paraffins as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids | Dennis K. Clapper | 1998-11-17 |
| 5671810 | Composition and method for relief of differential sticking during drilling | Richard M. Hodge, Thomas Daves, Thomas F. Carter | 1997-09-30 |
| 5605879 | Olefin isomers as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids | David Schwertner | 1997-02-25 |
| 4664818 | Drilling mud additive | Vincent M. Thielen | 1987-05-12 |