Coal auger guidance system

Details Coal auger guidance system Coal auger guidance system

1979-12-17

1985-06-18

Pate, III, William F.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

299 1, 175 61, 181108, E21B 4712, E21C 3508

Patent

active

045236518

ABSTRACT:
A method and apparatus for maintaining a second elongated hole axis substantially parallel to a previously bored horizontal hole axis which entails inserting a seismic signal generating apparatus into one hole and a seismic signal receiving apparatus into the other hole. The seismic receiver includes apparatus for moving it along the axis, for maintaining the receiver substantially parallel to the gravitational bottom of the hole, and for moving the receiver a predetermined distance from the borehole wall which is adjacent the borehole containing the seismic signal generating apparatus. Apparatus for observing the detected signal is located outside the borehole.

REFERENCES:
patent: 3578807 (1971-05-01), Barrett
patent: 3853185 (1974-12-01), Dahl
patent: 3891050 (1975-06-01), Kirkpatrick
patent: 3978939 (1976-09-01), Troullier
patent: 4006359 (1977-02-01), Sullins
patent: 4072349 (1978-02-01), Hartley

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