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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
Softening of Rocks:
                     Enabling Deeper Drilling
                  with Lower Power Consumption
This proposal is based on results
obtained 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
Softening of Rocks:
                     Enabling Deeper Drilling
                  with Lower Power Consumption

Goals

1. Determine the mechanism of rock
softening and its effect on the drilling
resistance.

2.Use results from 1 to identify the actions
Where, When, and How to decrease the
relative contributions from these effects.

3.Implement the results from 1 and 2
in a demonstrator.




                                   Ronneby
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                              PARTNERS
READINESS LEVEL
                             - Blekinge Institute of Technology
 TRL 2 and rising            - NASA Ames Research Center

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Softening of Rocks: Enabling Deeper Drilling with Lower Power

  • 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 Consumption This proposal is based on results obtained 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 Consumption Goals 1. Determine the mechanism of rock softening and its effect on the drilling resistance. 2.Use results from 1 to identify the actions Where, When, and How to decrease the relative contributions from these effects. 3.Implement the results from 1 and 2 in 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  PARTNERS READINESS LEVEL - Blekinge Institute of Technology TRL 2 and rising - NASA Ames Research Center