Drill bit and method for explosive drilling
Abstract
Abstract THE PARTICULAR EMBODIMENT DESCRIBED HEREIN AS ILLUSTRATIVE OF ONE FORM OF THE INVENTION UTILIZES A DRILL BIT HAVING A FLUID EXIT FOR PASSING DRILLING FLUIDS FROM THE INTERIOR OF THE DRILL PIPE TO THE EXTERIOR OF THE DRILL BIT. THE SURFACE SURROUNDING THE EXIT IS FORMED IN THE SHAPE OF A PARABOLA. EXPLOSIVE CAPSULES ARE PLACED IN THE DRILLING FLUID STREAM AND THEN MOVED WITH THE DRILING FLUID THROUGH THE DRILL STEM AND OUT THE OPENING IN THE BIT FOR IMPACT WITH THE FORMATION, WHEREUPON THE EXPLOSIVE CAPSULE IS DETONATED. PRIMARY ENERGY IN THE FORM OF A SHAPED JET CHARGE IS DIRECTED INTO THE FORMATION TO PENETRATE THE BOTTOM OF THE BOREHOLE AND CAUSE FRACTURING OF FORMATION MATERIALS. IN ADDITION, UPWARDLY DIRECTED ENERGY FROM THE SHAPED EXPLOSIVE CHARGE IS REFLECTED FROM THE PARABOLICLIKE SURFACE OF THE DRILL BIT TO PROVIDE A SECONDARY ENERGY SOURCE DIRECTED AGAINST THE FORMATION AT THE BOTTOM OF THE BOREHOLE.
Inventors
- 👤 John D Bennett
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |