Back to results
US 6,142,250 AGranted
Rotary drill bit having moveable formation-engaging members
AssigneeCamco International (UK) Limited
InventorsNigel Dennis Griffin, John Michael Fuller, Alex Newton, Malcolm Roy Taylor, Andrew Murdock, Steven Taylor
Life of this patent
Estimating the term…
Abstract
Formation engaging elements are moveably mounted onto a drill bit. Such elements may be used to protect other rigidly mounted formation engaging elements from impacts that occur during use of the drill bit, or they may be used to alter the aggressiveness of the drill bit when used in directional drilling operations.
Claims36
A rotary drill bit for drilling subsurface formations, the drill bit comprising:
- a bit body;
- a plurality of blades disposed on the bit body;
- a first plurality of formation-engaging elements disposed on at least one of the plurality of blades, the first plurality of formation-engaging elements being rigidly affixed to the bit body;
- a second plurality of formation-engaging elements being disposed on at least one of the plurality of blades, the second plurality of formation-engaging elements being moveable between an extended position and a retracted position and being biased into the extended position, the extended position placing each of the second plurality of formation-engaging elements at a greater projection than the first plurality of formation-engaging elements;
- and
- a biasing member operatively coupled to each of the second plurality of formation-engaging elements.
3 more elements
A rotary drill bit for drilling subsurface formations, the drill bit comprising:
- a bit body;
- a plurality of blades disposed on the bit body;
- a first plurality of formation-engaging elements disposed on at least one of the plurality of blades, the first plurality of formation-engaging elements being rigidly affixed to the bit body;
- a second plurality of formation-engaging elements being disposed on at least one of the plurality of blades, the second plurality of formation-engaging elements being moveable between an extended position and a retracted position and being biased into the extended position, the extended position placing each of the second plurality of formation-engaging elements at a greater projection than the first plurality of formation-engaging elements;
- and
- a biasing member operatively coupled to each of the second plurality of formation-engaging elements;
- wherein the biasing member comprises a spring.
4 more elements
A rotary drill bit for drilling subsurface formations, the drill bit comprising:
- a bit body;
- a plurality of blades disposed on the bit body;
- a first plurality of formation-engaging elements disposed on at least one of the plurality of blades, the first plurality of formation-engaging elements being rigidly affixed to the bit body;
- a second plurality of formation-engaging elements being disposed on at least one of the plurality of blades, the second plurality of formation-engaging elements being moveable between an extended position and a retracted position and being biased into the extended position, the extended position placing each of the second plurality of formation-engaging elements at a greater projection than the first plurality of formation-engaging elements;
- and
- a biasing member operatively coupled to each of the second plurality of formation-engaging elements;
- wherein the biasing member comprises an elastomeric member.
4 more elements
A rotary drill bit for drilling subsurface formations, the drill bit comprising:
- a bit body;
- a plurality of blades disposed on the bit body;
- a first plurality of formation-engaging elements disposed on at least one of the plurality of blades, the plurality of formation-engaging elements being rigidly affixed to the bit body;
- a second plurality of formation-engaging elements being disposed on at least one of the plurality of blades, the second plurality of formation-engaging elements being moveable between an extended position and a retracted position and being biased into the extended position, the extended position placing each of the second plurality of formation-engaging elements at a greater projection than the first plurality of formation-engaging elements;
- and
- a biasing member operatively coupled to each of the second plurality of formation-engaging elements;
- wherein the biasing member comprises a compressed gas bellows.
4 more elements
Dependencies are inferred from the claim text.