Drilling tool with retractable pilot drilling unit

Details Drilling tool with retractable pilot drilling unit Drilling tool with retractable pilot drilling unit

1990-04-12

1991-08-13

Melius, Terry Lee

Boring or penetrating the earth

With means movable relative to tool to receive, retain, or...

Receiver removable through below-ground tool shaft

175250, 175257, 175387, E21B 2504

Patent

active

050388738

ABSTRACT:
The present invention comprises a drilling tool including a retractable pilot drilling unit driven by a fluid operated motor, the motor comprising a stator mounted on the interior of a tubular outer housing and a rotor mounted on the exterior of a tubular inner housing axially supported in said outer housing and rotationally free with respect thereto. The pilot drilling unit is rotationally fixed within the inner housing, but axially moveable therewithin so that pressure of drilling fluid used to drive the motor will also act on reaction surfaces of the pilot drilling unit to urge it axially forward. The top of the pilot drilling unit includes a fishing head for retracting the pilot drilling unit from the drilling tool, and reinserting it therein.

REFERENCES:
patent: 2910273 (1959-10-01), Bon
patent: 2944792 (1960-07-01), Gros
patent: 4518050 (1985-05-01), Sollie et al.
patent: 4875531 (1989-10-01), Biehl et al.

Affiliated with

Also associated with

Rating

Drilling tool with retractable pilot drilling unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drilling tool with retractable pilot drilling unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drilling tool with retractable pilot drilling unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1521403