Fatique Weakening of Hard Rock with Cyclic Underbalanced Pressures

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG03-96ER82264
Agency Tracking Number: 34673
Amount: $74,900.00
Phase: Phase I
Program: SBIR
Awards Year: 1996
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Waterjet Technology, Inc.
21414 68th Avenue South, Kent, WA, 98032
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Mr. Ronald C. Lilley
 Senior Engineer
 (206) 872-9500
Business Contact
 Dr. Edward M Bohn
Title: President
Phone: (206) 872-9500
Research Institution
41076 November 20, 1996 Quest Integrated, Inc. Hard rock drilling is a difficult and expensive process that limits our ability to develop geothermal resources. This project will investigate methods of fatigue weakening the rock to increase the penetration rate and reduce the wear of conventional drill bits. Hydraulic power, available during drilling, will be used to drive cyclic pressure fluctuations, which are comparable to the tensile strength of hard rock. In Phase I, an experimental study will explore the relationship between drilling strength and the amplitude and frequency of the pressure fluctuations to fatigue rock. The feasibility of a drilling subassembly, capable of inducing high-amplitude cyclic pressure variations at the bit face, will be evaluated. Commercial Applications and Other Benefits as described by the awardee: The techniques should result in improved penetration rates in hard rock with indentation or drag bit cutters. Increased drilling rate in hard formations. This will allow for better utilization of geothermal resources by reducing the cost of exploration and production. The approach should also be effective for increasing drilling rates for oil and gas exploration.

* information listed above is at the time of submission.

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