Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1981-04-06
1982-06-22
Novosad, Stephen J.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
308 82, 308187, E21B 1024
Patent
active
043357911
ABSTRACT:
Improved lubricant pressure compensation is achieved in apparatus operative between substantially different changing pressures, for example earth drilling tools and deep submergence ocean machinery, by a flexible hermetically sealed gas-containing chamber which is operative to apply ambient pressures through the interiorly contained gas to a flexible wall membrane which at least partially defines a lubricant containing reservoir. The pressure exerting chamber and the lubricant containing reservoir may both be defined by flexible bladder-like structures with the lubricant containing reservoir contained within the interior of the pressure exerting chamber. In earth drilling apparatus, the reservoir and chamber structures are preferably operatively positioned on a drill collar in adjacency to a rotary drill bit, and lubricant is communicated through passageways from the reservoir to the bearing and seal assemblies operative between the drill bit body and the rotationally mounted cutter wheels.
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Chapter 9 in Drilling Practices Manual, "Surge and Swab Practices".
Ley John R.
Novosad Stephen J.
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