Title:
指向性掘削システム
Document Type and Number:
Japanese Patent JP2011523987
Kind Code:
A
Abstract:
A directional drilling system comprises a main drill bit 24 rotatable about a main bit axis 26, a pilot drill bit 34 rotatable about a pilot bit axis 36 substantially parallel to the main bit axis 26, and adjustment means 28 for adjusting the position of the pilot bit axis 36 relative to the main bit axis 26.
Inventors:
Johnson Ashley Bee
Application Number:
JP2010538951A
Publication Date:
August 25, 2011
Filing Date:
December 16, 2008
Export Citation:
Assignee:
Schlnmberger Holdings Limited
International Classes:
E21B7/06; E21B10/26
Domestic Patent References:
| JPH02197691A | 1990-08-06 | |||
| JPS61176790A | 1986-08-08 | |||
| JPH06504822A | 1994-06-02 | |||
| JPH03115695A | 1991-05-16 | |||
| JP2001520339A | 2001-10-30 | |||
| JPS61179805A | 1986-08-12 | |||
| JPH03197789A | 1991-08-29 | |||
| JPH03110288A | 1991-05-10 | |||
| JPS61176789A | 1986-08-08 | |||
| JPH02197691A | 1990-08-06 | |||
| JPS61176790A | 1986-08-08 | |||
| JPH06504822A | 1994-06-02 | |||
| JPH03115695A | 1991-05-16 | |||
| JP2001520339A | 2001-10-30 | |||
| JPS61179805A | 1986-08-12 | |||
| JPH03197789A | 1991-08-29 |
Attorney, Agent or Firm:
Koichi Tsujii
Sadao Kumakura
Disciple Maru Ken
Ino Sato
Mitsuru Matsushita
Ichiro Kurasawa
Toru Watanabe
Sadao Kumakura
Disciple Maru Ken
Ino Sato
Mitsuru Matsushita
Ichiro Kurasawa
Toru Watanabe