Boring or penetrating the earth – Processes – Sampling of earth formations
Patent
1992-03-02
1994-04-12
Britts, Ramon S.
Boring or penetrating the earth
Processes
Sampling of earth formations
175246, E21B 4902
Patent
active
053017595
ABSTRACT:
An electrically-driven downhole coring method and apparatus which is powered by and conveyed to and from the bottom of the corehole by means of a heavy-duty electromechanical cable. The downhole core-sampling apparatus is equipped with a combination reamer, stabilizer, and external-reforcing component which also functions as an external axial-thrust weight, drilling-fluid circulation pump, and helical inertial-displacement elevator or excavated rock particles. During the high-speed rotation of the core-sampling apparatus by the downhole electric motor, drilling fluid with its load of excavated rock particles is displaced upward from the bottom of the corehole into the interior of a combination centrifuge/storage-chamber component where the excavated rock particles are separated from the lower-density drilling fluid and the clarified drilling fluid is circulated downward along a decreasing pressure gradient to the core bit, thus completing its circulation loop. When the downhole apparatus is filled to capacity it is hoisted to the surface with it load of cored rock and excavated rock particles by a heavy-duty electromechanical cable. An expansible contractible and remotely-controlled wheeled-reactive-torque suppressor positioned near the top of the downhole apparatus prevents any reactive-torque-induced rotation of the apparatus and allows the latter to descend downward in an unimpeded manner as the coring operation progresses downward.
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Britts Ramon S.
Tsay Frank S.
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