Modulated bias unit for rotary drilling

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

175 61, E21B 708

Patent

active

056737637

ABSTRACT:
A modulated bias unit, for controlling the direction of drilling of a rotary drill bit when drilling boreholes in subsurface formations, comprises a number of hydraulic actuators spaced apart around the periphery of the unit. Each actuator comprises a movable thrust member which is hydraulically displaceable outwardly and a pivotally mounted formation-engaging pad which overlies the thrust member. An inlet passage supplies fluid under pressure to the chamber, and an outlet passage delivers fluid from the chamber to a lower pressure zone. A selector control valve modulates the fluid pressure supplied to each actuator in synchronism with rotation of the drill bit so that, as the drill bit rotates, each pad is displaced outwardly at the same selected rotational position so as to bias the drill bit laterally and thus control the direction of drilling. The outlet passage from the chamber passes through the thrust member so as to wash the region where the formation-engaging pad overlies the thrust member as the fluid flows to the annulus between the unit and the borehole.

REFERENCES:
patent: 5553678 (1996-09-01), Barr et al.
patent: 5553679 (1996-09-01), Thorp

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Modulated bias unit for rotary drilling does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Modulated bias unit for rotary drilling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulated bias unit for rotary drilling will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2350297

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.