Downhole drilling system

Details Downhole drilling system Downhole drilling system

1976-11-05

1977-10-04

Leppink, James A.

Boring or penetrating the earth

Means carried by housing insertable in inaccessible hole to...

E21B 704

Patent

active

040519082

ABSTRACT:
According to the invention an improved system for the drilling of small holes from and at right angles to a vertical well hole. The system is directed by a ninety degree elbow attached to the downhole end of a small diameter tube section. The uphole end of the tube section is attached to the downhole end of a large diameter tubing string. A downhole electrical motor operates the drilling part of the system from inside the large diameter tubing string. The drive part of the system which operates the drill bit consists of a pump, which also provides drilling fluids to the drill bit, a small diameter drill pipe, a flexible drill pipe which operates the drill bit from around the ninety degree elbow. An electrical mechanical cable provides power to the electrical motor and hoists the electrical motor and its attachments in and out of the tubing string. An anti-torque mechanism attached to the uphole end of the electrical motor holds the electrical motor in place when the electrical motor is in operation.

REFERENCES:
patent: 2500785 (1950-03-01), Arutunoff
patent: 2516421 (1950-07-01), Robertson
patent: 2906499 (1959-09-01), Travis
patent: 3797576 (1974-03-01), Azalbert et al.

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