Issued Patents All Time
Showing 51–70 of 70 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6995360 | Method and sensor for monitoring gas in a downhole environment | Boris Matveev, Vladimir Vaynshteyn, Christian Besson, Oliver C. Mullins, Li Jiang | 2006-02-07 |
| 6939717 | Hydrogen sulphide detection method and apparatus | Li Jiang, Oliver C. Mullins, Xu Wu | 2005-09-06 |
| 6920928 | Method for water control | Stephen Davies, Silke Olthoff, Gary John Tustin | 2005-07-26 |
| 6886406 | Downhole deposition monitoring system | Benoit Couet | 2005-05-03 |
| 6880402 | Deposition monitoring system | Benoit Couet | 2005-04-19 |
| 6803348 | Hydrophobically modified polymers for water control | Gary John Tustin | 2004-10-12 |
| 6433075 | Surfactant based gelling composition for wellbore service fluids | Stephen Davies, Gary John Tustin | 2002-08-13 |
| 6232274 | Viscoelastic surfactant based gelling composition for wellbore service fluids | Trevor Hughes, Gary John Tustin | 2001-05-15 |
| 6223822 | Downhole sampling tool and method | — | 2001-05-01 |
| 6194356 | Gelling composition for wellbore service fluids | Gary John Tustin | 2001-02-27 |
| 6145592 | Gelling polymers for wellbore service fluids | Gary John Tustin | 2000-11-14 |
| 6001280 | Oil-soluble tracer solutions containing gadolinium compounds | — | 1999-12-14 |
| 5711900 | Gadolinium compounds for use as oil-soluble tracers | — | 1998-01-27 |
| 5475220 | Method to determine the phase composition of cement | Trevor Hughes, Philip Fletcher | 1995-12-12 |
| 5360738 | Method of quantitative analysis of drilling fluid products | Trevor Hughes | 1994-11-01 |
| 5306909 | Analysis of drilling fluids | Trevor Hughes, Patrick Tomkins | 1994-04-26 |
| 5161409 | Analysis of drilling solids samples | Trevor Hughes | 1992-11-10 |
| 5140527 | Method for the determination of the ionic content of drilling mud | Trevor Hughes, Philip Fletcher | 1992-08-18 |
| 4904603 | Monitoring drilling mud | Trevor Hughes | 1990-02-27 |
| 4878382 | Method of monitoring the drilling operations by analyzing the circulating drilling mud | Trevor Hughes | 1989-11-07 |