| 8088716 |
Compressible objects having a predetermined internal pressure combined with a drilling fluid to form a variable density drilling mud |
Richard S. Polizzotti, Dennis G. Peiffer, Ramesh Gupta, Norman Pokutylowicz, Barbara Carstensen +1 more |
2012-01-03 |
| 8088717 |
Compressible objects having partial foam interiors combined with a drilling fluid to form a variable density drilling mud |
Richard S. Polizzotti, Dennis G. Peiffer, Ramesh Gupta, Norman Pokutylowicz, Barbara Carstensen +1 more |
2012-01-03 |
| 8076269 |
Compressible objects combined with a drilling fluid to form a variable density drilling mud |
Richard S. Polizzotti, Dennis G. Peiffer, Ramesh Gupta, Norman Pokutylowicz, Barbara Carstensen +1 more |
2011-12-13 |
| 7980329 |
System for managing variable density drilling mud |
Pavlin B. Entchev, Ramesh Gupta, Richard S. Polizzotti, Barbara Carstensen, Dennis G. Peiffer +1 more |
2011-07-19 |
| 7972555 |
Method for fabricating compressible objects for a variable density drilling mud |
Richard S. Polizzotti, Dennis G. Peiffer, Ramesh Gupta, Norman Pokutylowicz, Barbara Carstensen +1 more |
2011-07-05 |
| 7789162 |
Method for running tubulars in wellbores |
Stuart R. Keller, John K. Montgomery, Bruce A. Dale |
2010-09-07 |
| 7677332 |
Method and apparatus for managing variable density drilling mud |
Pavlin B. Entchev, Ramesh Gupta, Richard S. Polizzotti, Barbara Carstensen, Dennis G. Peiffer +1 more |
2010-03-16 |