Particle drilling alters standard rock-cutting approach

Tag : roller extruder

Tough areas removed by particle impacts include the gauge corner ofthe bottomhole profile, the center and the nose/flank. Theremaining area forming a rock ring is relieved from depth stressesand is easily removed when pressed by an angled surface on the bitbody using only 5,000 to 15,000 pounds of applied weight.
The angled surface and relatively light weight on bit inducestensile stresses to the weak rock ring, continuously breaking itinto marble sized pieces. The pieces along with the particles andother cuttings are directed through the bits very large junk slotsinto the annulus, where they are pumped out of the hole with thecirculating mud.
PIS . This surface equipment entrains the particles into the pressuredmud flow, sending the mud/shot slurry down the drill pipe to thebit.
The PIS equipment consists of a tower and frame 11.5-ft wide