Title:
DIRECTIONAL DRILLING APPARATUS
Document Type and Number:
WIPO Patent Application WO2000047860
Kind Code:
A3
Abstract:
In a directional drilling apparatus in which a sensor/transmitter or sonde is located in one section of a drill string and an element of an adjacent section is configured to "steer" the bore drilled in a predetermined lateral direction, means is provided for automatically ensuring correct registry or alignment of the sensor/transmitter and the steerable element, this means comprising an azimuth member on the section carrying the sensor/transmitter engageable with a reference member of the adjoining section to present, after such engagement, relative rotation of the azimuth member, which is rotatable in the section carrying it, with the sensor/transmitter, but non-rotatably connected with the sonde. The reference member or the azimuth member is resiliently displaceable axially to allow the two sections to be screwed up together.
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Inventors:
FALVEY ALISTAIR MICHAEL (GB)
GARTSIDE JOHN WILLOUGHBY (GB)
GARTSIDE JOHN WILLOUGHBY (GB)
Application Number:
PCT/GB2000/000452
Publication Date:
December 07, 2000
Filing Date:
February 11, 2000
Export Citation:
Assignee:
HALCO DRILLING INTERNAT LTD (GB)
FALVEY ALISTAIR MICHAEL (GB)
GARTSIDE JOHN WILLOUGHBY (GB)
FALVEY ALISTAIR MICHAEL (GB)
GARTSIDE JOHN WILLOUGHBY (GB)
International Classes:
E21B7/04; E21B7/08; E21B10/36; E21B17/02; E21B17/046; (IPC1-7): E21B7/04; E21B17/02; E21B10/36; E21B17/046
Domestic Patent References:
| WO1997049889A1 | 1997-12-31 | |||
| WO1998058153A1 | 1998-12-23 | |||
| WO1998005476A1 | 1998-02-12 |
Foreign References:
| EP0851090A1 | 1998-07-01 | |||
| US4862976A | 1989-09-05 | |||
| US4924948A | 1990-05-15 | |||
| US3955635A | 1976-05-11 |
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