Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Electrically produced heat
Patent
1976-12-15
1978-01-03
Purser, Ernest R.
Boring or penetrating the earth
Boring by directly applying heat to fluidize or comminute
Electrically produced heat
175 60, 299 14, E21B 714
Patent
active
040661385
ABSTRACT:
Earth boring apparatus is mounted above ground and directs an annulus of high powered laser energy downwardly for boring a cylindrical hole by fusing successive annular regions of the stratum to be penetrated at a power level that shatters and self-ejects successive cores from the hole. A first fluid blast above the hole deflects the ejected core as it exits from the hole. A second fluid blast above the hole ejects fluid to provide adequate fluid at the strata to be penetrated prior to actuation of the laser for promoting a thermal shock capable of shattering and ejecting the core.
Optical sensing separately detects the core shattering and the core ejection to control timed actuation of the system components.
REFERENCES:
patent: 914636 (1909-03-01), Case
patent: 2548463 (1951-04-01), Blood
patent: 3539221 (1970-11-01), Gladstone
patent: 3544165 (1970-12-01), Snedden
patent: 3556600 (1971-01-01), Shoupp et al.
patent: 3693718 (1972-09-01), Stout
patent: 3882945 (1975-05-01), Keenan
patent: 3998281 (1976-12-01), Salisbury et al.
"Novel Drilling Techniques" by William C. Maurer, Mar. 1968, N.Y. Pergamon Press.
Salisbury Winfield W.
Stiles Walter J.
Cagney J. Patrick
Purser Ernest R.
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