| 10113363 |
System and related methods for control of a directional drilling operation |
— |
2018-10-30 |
| 9458679 |
Apparatus and method for damping vibration in a drill string |
William Evans Turner, Mark Hutchinson, Dirk Bosman, Mark Ellsworth Wassell, Carl Allison Perry |
2016-10-04 |
| 9279903 |
Apparatus for measuring bending on a drill bit operating in a well |
Mark Ellsworth Wassell, Carl Allison Perry |
2016-03-08 |
| 8397562 |
Apparatus for measuring bending on a drill bit operating in a well |
Mark Ellsworth Wassell, Carl Allison Perry |
2013-03-19 |
| 7762356 |
Rotary steerable motor system for underground drilling |
William Evans Turner, Carl Allison Perry, Mark Ellsworth Wassell, Jason R. Barbely, Daniel E. Burgess |
2010-07-27 |
| 7681663 |
Methods and systems for determining angular orientation of a drill string |
— |
2010-03-23 |
| 7389830 |
Rotary steerable motor system for underground drilling |
William Evans Turner, Carl Allison Perry, Mark Ellsworth Wassell, Jason R. Barbely, Daniel E. Burgess |
2008-06-24 |
| 5242020 |
Method for deploying extendable arm for formation evaluation MWD tool |
— |
1993-09-07 |
| 5034929 |
Means for varying MWD tool operating modes from the surface |
Walter A. Helm |
1991-07-23 |
| 4894923 |
Method and apparatus for measurement of azimuth of a borehole while drilling |
Richard D. DiPersio, Edmund M. Hamlin |
1990-01-23 |
| 4813274 |
Method for measurement of azimuth of a borehole while drilling |
Richard D. DiPersio |
1989-03-21 |
| 4761889 |
Method for the detection and correction of magnetic interference in the surveying of boreholes |
Frederick A. Stone, Edmund M. Hamlin |
1988-08-09 |
| 4716973 |
Method for evaluation of formation invasion and formation permeability |
— |
1988-01-05 |
| 4647853 |
Mud turbine tachometer |
— |
1987-03-03 |