Fluid flow restrictor valve for a drill hole coring tool

Details Fluid flow restrictor valve for a drill hole coring tool Fluid flow restrictor valve for a drill hole coring tool

1979-06-25

1981-07-28

Purser, Ernest R.

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

173 8, 175 58, 175 61, 175 78, 251 63, E21B 4906

Patent

active

042805694

ABSTRACT:
An apparatus operable on a wireline logging cable for drilling a hole in the sidewall of a drill hole which comprises a hydraulically operated backup shoe for wedging the apparatus at a selected location in the drill hole, a hydraulic motor with a drilling bit connected thereto for rotation by the hydraulic motor and hydraulic means connected to the hydraulic motor for moving the bit into drilling engagement with the sidewall of the drill hole. In the improvement of this invention, the hydraulic means for moving the bit into drilling engagement comprises a new flow restrictor valve. This flow restrictor valve has an orifice and a slender pointed rod for restricting the flow of fluid through the orifice. Opposing spring means and control fluid means engage the rod for controlling its movement toward and away from the orifice.

REFERENCES:
patent: 737383 (1903-08-01), Galey
patent: 2521976 (1950-09-01), Hays
patent: 2905441 (1959-09-01), Poundstone
patent: 3525406 (1970-08-01), Hart
patent: 4007797 (1977-02-01), Jeter

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