Method for excavating a large diameter shaft into the earth and

Wells – Processes – Heating – cooling or insulating

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166272, 166245, 166275, 405130, E21B 3600, E21B 4324, E21B 4330

Patent

active

045974446

ABSTRACT:
A method for positioning a large diameter shaft from the surface into the earth and at least partially through a subterranean oil-bearing formation, said method comprising

REFERENCES:
patent: 2777679 (1957-01-01), Ljungstrom
patent: 2862558 (1958-12-01), Dixon
patent: 2897894 (1959-08-01), Draper et al.
patent: 3183675 (1965-05-01), Schroeder
patent: 3267680 (1966-08-01), Schlumberger
patent: 3271962 (1966-09-01), Dahms et al.
patent: 3279538 (1966-10-01), Dosher
patent: 3344607 (1967-10-01), Vignovich
patent: 3354654 (1967-11-01), Vignovich
patent: 4474238 (1984-10-01), Gentry et al.

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