softening of rocks: enabling deeper drilling with lower power
TRANSCRIPT
Using results from an earl ier CIF proposal to make rock dri l l ing easier and more energy-eff icient.
Stage I: determine the competing and reinforcing factors that inf luence the dri l l ing resistance
Stage II : use this knowledge to manipulate the dri l l ing
process
Stage II I : show these effects in a demonstrator
Softening of Rocks: Enabling Deeper Drilling
with Lower Power Consumption
Friedemann FreundNASA Ames / SETI / SJSU
Claes HedbergSETI / Blekinge Inst. Tech.
This proposal is based on results obtained in the earl ier CIF proposal
* Mechanical inf luences such as ultrasound (US) changes the elastic modulus of rocks
* Changes are t ime-dependent, but there is also recovery
* Volume expansion and contraction, which depend on the t ime history of the inf luencing factors
Ronneby
Softening of Rocks: Enabling Deeper Drilling
with Lower Power Consumption
To this we add the knowledge that
• Higher temperatures lead to volume expansion
• Frict ional 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 dri l l ing resistance.
2.Use results from 1 to identify the actions Where, When, and How to decrease the relat ive contributions from these effects.
3.Implement the results from 1 and 2 in a demonstrator.
EXTERNAL CUSTOMERS
Mining IndustryConstruction Industry
Oil & Gas Industry
TECHNOLOGY READINESS LEVEL
TRL 2 and rising
BENEFITS
A. lower energy expenditure on dri l l ing missions to solar system solid bodies
B.Dril l ing faster and deeper
C.Less wear on dri l l bi ts
PARTNERS
- Blekinge Institute of Technology- NASA Ames Research Center
Softening of Rocks: Enabling Deeper Drilling
with Lower Power Consumption