A method for using rock debris to line a wellbore and/or removing unused rock debris from a wellbore involving a downhole crusher.

摘要

A rock crushing/grinding apparatus is placed downhole near to the drill-bit and is adapted to increase the volume of reduced particle size rock debris generated by increasing the frequency of impact and associated breakage of the rock debris inventory, per revolution of the conduit string and/or per volume of fluid slurry circulated. The crushed rock debris then coats the unlined strata wall of said passageway to inhibit strata fracture initiation or propagation. The borehole is also flushed at an increased rate by the associated reduction in fluid slurry suspension or velocities needed to urge the rock debris through the unlined strata passageway.