Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6668943 | Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser | Torney M. Van Acker, Mark E. Ehrhardt | 2003-12-30 |
| 6578637 | Method and system for storing gas for use in offshore drilling and production operations | Mark E. Ehrhardt | 2003-06-17 |
| 6571873 | Method for controlling bottom-hole pressure during dual-gradient drilling | — | 2003-06-03 |