Smaller Footprint Drilling System for Deep and Hard Rock Environments; Feasibility of Ultra-High-Speed Diamond Drilling Page: 4 of 72
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Feasibility of Ultra-High Speed Diamond Drilling
* The drill bits were run at rotary speeds up to 5500 rpm and weight on bit (WOB) to 8000
During Phase 2, the ROP as measured in depth of cut per bit revolution generally increased with
increased WOB. The performance was mixed with increased rotary speed, with the depth cut
with the impregnated drill bit generally increasing and the TSP and hybrid TSP drill bits
The ROP in ft/hr generally increased with all bits with increased WOB and rotary speed.
The mechanical specific energy generally improved (decreased) with increased WOB and was
mixed with increased rotary speed.
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TerraTek, A Schlumberger Company. Smaller Footprint Drilling System for Deep and Hard Rock Environments; Feasibility of Ultra-High-Speed Diamond Drilling, report, December 31, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc833694/m1/4/: accessed February 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.