Underreamer drill hammer
AssigneeCenter Rock Inc.
InventorsWarren Thomas Lay, Austin C. Hine
Life of this patent
Estimating the term…
Abstract
An underreamer drill hammer comprising a canister including a housing having an outer diameter, a proximal end configured for attachment to a drill string, and a percussive drill hammer housed within the housing, the percussive drill hammer having a drill bit movable between a radially retracted position and a radially extended position. The drill bit can rotate and is designed in a manner that the drill bit head cams, pivots, or swings out to a larger cutting diameter when the system is rotated in a first direction. The system is rotated in a second direction to retract the bit heads. The bits are retracted to remove the canister from the casing or to drill a smaller diameter hole through rock.
Claims21
An underreamer drill hammer comprising:
- a canister having:
- a housing having an outer diameter,
- a proximal end configured for attachment to a drill string,
- a plurality of percussive drill hammers housed within the housing, each percussive drill hammer having a single drill bit movable between a radially retracted position and a radially extended position;
- and
- a stop about a distal end of the canister for engaging the drill bit.
An underreamer drill hammer comprising:
- a canister having:
- a housing having an outer diameter,
- a proximal end configured for attachment to a drill string,
- a plurality of percussive drill hammers housed within the housing, each percussive drill hammer having a single drill bit movable between a radially retracted position and a radially extended position;
- and
- a plate at a distal end of the canister including a recess for receiving the drill bit.
An underreamer drill hammer comprising:
- a canister having:
- a housing having an outer diameter,
- a proximal end configured for attachment to a drill string,
- a plurality of percussive drill hammers housed within the housing, each percussive drill hammer having a single drill bit movable between a radially retracted position and a radially extended position;
- and
- another percussive drill hammer that does not include a drill bit moveable between a radially retracted position and a radially extended position.
Dependencies are inferred from the claim text.