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Softening of Rocks: Enabling Deeper Drilling with Lower Power
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Softening of Rocks: Enabling Deeper Drilling with Lower Power

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  • 1. Softening of Rocks: Enabling Deeper Drilling with Lower Power Consumption Using results from an earlier CIF proposal to make rock drilling easier and more energy-efficient.Stage I: determine the competing and reinforcing factors that influence the drilling resistance Stage II: use this knowledge to manipulate the drilling process Stage III: show these effects in a demonstrator Friedemann Freund NASA Ames / SETI / SJSU Claes Hedberg SETI / Blekinge Inst. Tech. friedemann.t.freund@nasa.gov; claes.hedberg@bth.se
  • 2. Softening of Rocks: Enabling Deeper Drilling with Lower Power ConsumptionThis proposal is based on resultsobtained in the earlier CIF proposal * Mechanical influences such as ultrasound (US) changes the elastic modulus of rocks * Changes are time-dependent, but there is also recovery * Volume expansion and contraction, which depend on the time history of the influencing factors To this we add the knowledge that • Higher temperatures lead to volume expansion • Frictional forces from the bore hole increase with depth. Ronneby
  • 3. Softening of Rocks: Enabling Deeper Drilling with Lower Power ConsumptionGoals1. Determine the mechanism of rocksoftening and its effect on the drillingresistance.2.Use results from 1 to identify the actionsWhere, When, and How to decrease therelative contributions from these effects.3.Implement the results from 1 and 2in a demonstrator. Ronneby
  • 4. Softening of Rocks: Enabling Deeper Drilling with Lower Power Consumption BENEFITS A. lower energy expenditure on drilling missions to solar system solid bodies B.Drilling faster and deeper C.Less wear on drill bits EXTERNAL CUSTOMERS Mining Industry Construction Industry Oil & Gas Industry TECHNOLOGY  PARTNERSREADINESS LEVEL - Blekinge Institute of Technology TRL 2 and rising - NASA Ames Research Center