| Patent Number |
Title Of Patent |
Date Issued |
| 7073609 |
Apparatus and methods for imaging wells drilled with oil-based muds |
July 11, 2006 |
| A resistivity logging sensor for logging while drilling a well using an oil-based mud includes a sensor body; a first current injector electrode disposed on the sensor body, wherein the first current injector electrode is electrically insulated from the sensor body; at least two current |
| 7004263 |
Directional casing drilling |
February 28, 2006 |
| A directional casing drilling system including a casing string for rotation of a drill bit, a shaft coupled to the casing string, and a sleeve having pads that are hydraulically extensible. The sleeve may be positioned about a portion of the shaft. The invention may also include a tu |
| 6837315 |
Rotary steerable drilling tool |
January 4, 2005 |
| The invention refers to a rotary steerable drilling tool having a tool collar and a bit shaft. The bit shaft is supported within the tool collar for pivotal movement about a fixed position along the bit shaft. Moreover, the rotary steerable drilling tool includes a variable bit shaft |
| 6092610 |
Actively controlled rotary steerable system and method for drilling wells |
July 25, 2000 |
| An actively controlled rotary steerable drilling system for directional drilling of wells having a tool collar rotated by a drill string during well drilling. A bit shaft has an upper portion within the tool collar and a lower end extending from the collar and supporting a drill bit. The |
