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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 h

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.

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In a method of drilling into the sidewall of a drill hole penetrating a subterranean formation which comprises positioning at a selected location in the drill hole an apparatus for drilling into the sidewall of a drillhole, wherein said apparatus comprises a support member, a shoe means mounted to s

In a method of drilling into the sidewall of a drill hole penetrating a subterranean formation which comprises positioning at a selected location in the drill hole an apparatus for drilling into the sidewall of a drillhole, wherein said apparatus comprises a support member, a shoe means mounted to said support member for movement toward and away from the sidewall of a drill hole, a hydraulic motor means mounted to said support member for movement toward and away from the sidewall of the drill hole, and a drill bit means connected to the rotor of said hydraulic motor for drilling a hole, and activating said shoe means for wedging said apparatus to said selected locations to said drill hole, followed by activating said hydraulic motor means for rotating said drilling bit and moving said drilling bit means into drilling engagement with the sidewall of a drill hole, followed by retracting said drilling bit means and then said shoe means and removing said apparatus and further comprising hydraulic drive means for moving the hydraulic motor means toward the sidewall of a drill hole, wherein the improvement comprises; flowing fluid from said hydraulic drive means through a fluid flow restrictor valve connected in said hydraulic drive means for controlling the movement of said hydraulic motor toward the sidewall of a drill hole, wherein said valve comprises an orifice means in said valve for the flow of fluid therethrough and an orifice restricting means connected in said valve for movement toward and away from said orifice means for restricting the flow of fluid through said orifice means, wherein said orifice restricting means comprises a housing having a first and second axially aligned cylinders separated by an annular shoulder, a piston in said first cylinder movable between a first position and a second position with the second position being closer to said annular shoulder, a spring urging said piston away from said annular shoulder, an orifice in said second cylinder, a slender pointed rod connected to said piston and extending through said annular shoulder in sealing relationship, a bleed port in the wall of said first cylinder between said piston and said annular shoulder, and an inlet on one side of said orifice and an outlet on the other side wherein said fluid for activating said hydraulic drive means for advancing said bit in connected through said inlet and said outlet; and connecting fluid from said hydraulic motor means to the interior of said first cylinder on the side of said piston opposite said annular shoulder.