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US 7,461,706 B2Granted
Drilling apparatus with percussive action cutter
AssigneeAndergauge Limited
InventorAlan Martyn Eddison
Life of this patent
Estimating the term…
Abstract
A drilling apparatus includes a cutting structure defined by a percussive action cutter and at least one other cutter. The percussive action cutter is adapted to be urged in a drilling direction by hydraulic pressure force, while the other cutter is urged in a drilling direction by mechanical force.
Claims37
A drilling apparatus comprising:
- a cutting structure defined by at least one percussive action cutter and at least one other cutter, the at least one percussive action cutter being adapted to be urged in a drilling direction by hydraulic pressure force;
- and
- a surface indicator to alert that the other cutter is cutting at a faster rate than the percussive action cutter.
A drilling method comprising the steps:
- providing a drilling apparatus comprising a cutting structure defined by at least one percussive action cutter and at least one other cutter;
- urging the at least one percussive action cutter in a drilling direction by hydraulic pressure force while urging the at least one other cutter in a drilling direction by mechanical force;
- and
- identifying that the percussive action cutter is cutting at a faster rate than the at least one other cutter,
- wherein identifying that the percussive action cutter is cutting at a faster rate than the at least one other cutter comprises identifying a change in back pressure in drilling fluid at surface.
2 more elements
A drilling method comprising the steps:
- providing a drilling apparatus comprising a cutting structure defined by at least one percussive action cutter and at least one other cutter;
- urging the at least one percussive action cutter in a drilling direction by hydraulic pressure force while urging the at least one other cutter in a drilling direction by mechanical force;
- identifying that the percussive action cutter is cutting at a faster rate than the at least one other cutter;
- and
- reducing the weight applied to the at least one other cutter.
2 more elements
A drilling apparatus comprising:
- a cuffing structure defined by at least one percussive action cutter and at least one other cutter, the at least one percussive action cuffer being adapted to be urged in a drilling direction by hydraulic pressure force and the at least one other cutter being adapted to be urged in said drilling direction by mechanical weight, the cutters having a preferred relative position range;
- and
- a cutter position indicator providing an output signal if the relative position of the cutters moves outside said preferred range.
Dependencies are inferred from the claim text.