Method and apparatus for subsoil drilling

Details Method and apparatus for subsoil drilling Method and apparatus for subsoil drilling

1989-06-14

1990-09-18

Dang, Hoang C.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 67, 175 73, 175320, 175324, 175424, E21B 706, E21B 718

Patent

active

049571737

ABSTRACT:
A method and apparatus for creating an underground bore hole using high pressure fluid within a drill string to disturb and displace the subsoil. The drill string is steerable by increasing the pressure of the fluid above a predetermined range to a second range and apparatus is responsive thereto to effect a bending movement and change in the direction of the drill string.

REFERENCES:
patent: 2345766 (1944-04-01), Miller
patent: 2643859 (1953-06-01), Brown
patent: 3199615 (1965-08-01), Storm
patent: 3457999 (1969-07-01), Massey
patent: 4286676 (1981-09-01), Nguyen et al.
patent: 4597454 (1986-07-01), Schoeffler
patent: 4790394 (1988-12-01), Dickinson, III et al.
patent: 4899835 (1990-02-01), Cherrington

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