Supplying motive fluid to below ground tool drive from a pressur

Details Supplying motive fluid to below ground tool drive from a pressur Supplying motive fluid to below ground tool drive from a pressur

1977-11-03

1978-10-17

Purser, Ernest R.

Boring or penetrating the earth

Processes

Boring with specific fluid

175 94, 175 99, 299 31, E21B 108, E21B 312

Patent

active

041203682

ABSTRACT:
A bore hole to be deepened far into air-impermeable bedrock has an air-tight lining and an air lock in its upper portion, and it is pressurized below the air lock. A duct comprising endwise connected but disconnectable duct sections extends through the bore hole, its top end open to the atmosphere. A drilling mechanism having a telescoping connection with the bottom of the duct comprises a bit driven by a pneumatic motor that has an exhaust air outlet opening into the duct and a pressure air inlet in the bore hole outside the duct. At intervals along the duct remotely controllable supporting and moving devices are fixed to duct sections, each device having a pneumatic actuator with an inlet opening to the bore hole and an outlet opening to the duct. The devices have gripping elements that frictionally engage the bore hole surface to confine the duct against motion or to move it up or down for raising or lowering the drilling mechanism. Boring waste is sucked into the duct and blown up to the surface by exhaust air from the motor and actuators.

REFERENCES:
patent: 2946578 (1960-07-01), De Smaele
patent: 3061287 (1962-10-01), Robbins
patent: 3180436 (1965-04-01), Kellner et al.
patent: 3185225 (1965-05-01), Ginies
patent: 3493165 (1970-02-01), Schonfeld
patent: 3942595 (1976-03-01), Suonishnikov et al.

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