Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore
Patent
1976-05-03
1977-06-21
Purser, Ernest R.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Firing control mechanically actuated in bore
175 455, E21B 700
Patent
active
040305570
ABSTRACT:
Well drilling rates may be increased by impelling projectiles to fracture rock formations and drilling with rock drill bits through the projectile fractured rock.
REFERENCES:
patent: 2544573 (1951-03-01), Vincent
patent: 3070010 (1962-12-01), Robinson, Jr.
patent: 3083778 (1963-04-01), Friedman et al.
patent: 3130797 (1964-04-01), Johnson
patent: 3491841 (1970-01-01), Robinson
patent: 3670828 (1972-06-01), Bennett
Drilling DCW July 1975 pp. 52 to 54.
Alvis Robert L.
Newsom Melvin M.
Carlson Dean E.
Favreau Richard E.
King Dudley W.
Purser Ernest R.
The United States of America as represented by the United States
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