German Section


  • Distinguished Lecturer Roy Ledgerwood - Solving the Mystery of Low Rate of Penetration in Deep Wells

    Monday, October 22, 2018, 6:00 PM - 9:30 PM DE
    Don’t miss this SPE Distinguished Lecturer! Solving the Mystery of Low Rate of Penetration in Deep Wells Roy Ledgerwood, Baker Hughes, a GE company   Rocks deep in the earth have unique and enigmatic material properties due to the confining pressures in the earth.  Confining pressure increases rock strength and changes rock from a brittle to a ductile material.  Humans tend to think of rock as brittle, since all of our direct experience with rock is at atmospheric pressure.  But as wells were drilled deeper into the earth, it became apparent that the rock being drilled in oilfield wells yielded much lower penetration rates than rocks of the same composition near the surface.  About seventy years ago, researchers in drilling mechanics began to study this by building high-pressure test facilities in which rock could be confined and drilled.  Even with these new test machines, researchers had to hypothesize what was happening to the rock at the bottom of the borehole because they could not observe the drilling process first-hand.  Though they understood that rocks under confining pressure become ductile, they continued to form hypotheses based on brittle failure mechanics.  This presentation reviews the detective-story history of model development to explain low rate of penetration in deep boreholes.  It then describes our current industry understanding of rock failure under a bit, which includes a significant role played by crushed rock detritus.  Current challenges facing the drilling mechanics community are identified.  This presentation constitutes a plea for continued research in this area.    About the Lecturer Roy Ledgerwood earned a BS in Mechanical Engineering from Texas Tech University in 1975 and began working for Hughes Tool Company Research.  Bob Cunningham, one of the pioneers in oil-field drilling mechanics, mentored him.  In 1987, Ledgerwood earned an MS in Mechanical Engineering from Rice University where he studied drilling mechanics with Dr. John Cheatham, another pioneer in the field.  When Hughes Tool Company built its Full-scale High Pressure Drilling Simulator—a test facility in which may stress rock rock up to 15,000 psi and test bits as large as 12 ¼”—Ledgerwood was the first supervisor of the facility.  He designed and performed unique tests to show that crushed rock detritus in a borehole has a strength on the same order of magnitude as the original rock at the instant it is created.  Ledgerwood has collaborated with other similar laboratories in Salt Lake City, Tulsa, and Pau, France in joint-industry and proprietary tests.  In addition to testing, Ledgerwood has modeled the drilling process with both Finite Element Analysis and Discrete Element Analysis.  These mathematical models show that most of the energy expended while drilling a deep well is dissipated not in failing the rock, but in extruding crushed rock detritus.  He holds 14 patents and is the author of 23 techincal papers.   An Extra 45 Minutes Can Provide a World of Knowledge Distinguished Lecturer Events      Attendee Evaluation Form Details and Registration Venue: Mercure Hotel Hannover, Oldenburger Allee 1, Hannover Date: October 22, 2018 Social Hour 18:00, Lecture 18:30, Meal 20:00 Language: Englisch Registration with Christopher Dalton Christopher.Dalton@bakerhughes.com );  Please indicate if you stay for the meal. Registration deadline: October 15, 2018 Admission (incl beverage and meal):   SPE and DGMK members 30€   SPE members discount for students and retirees: 10€   Non-members 35€​​​​ Coming next: November 26, 2018 Andreas Hartmann: Hitting the Sweetspot - Developments in Reservoir Navigation

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    Hannover, Germany

  • Brown Field Production @ STC 2018

    Wednesday, November 7, 2018, 1:00 PM - 6:00 PM CET
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    Freiberg, Germany

  • Reiche Zeche Tour @ STC 2018

    Wednesday, November 7, 2018, 2:00 PM - 4:30 PM CET

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    Freiberg, Germany

  • Terra MineraliaTour @ STC 2018

    Wednesday, November 7, 2018, 3:00 PM - 4:30 PM CET
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    Freiberg, Germany

  • Student Technical Conference 2018

    Thursday, November 8 - Friday, November 9, 2018
    Please visit the STC 2018 homepage  for more information about the event. This site is only valid for conducting the payment process, for  Non-Presenting Students  and Non-Sponsor Industry Representatives. Students have to choose the Student  and Non Sponsor Industry Representatives the Guest payment option. ​Note: The registration is only valid after entering your details on the STC form. Student Presenters and Industry Sponsors / Faculty Members only need to register on the STC form . More information about the registration process and charges can be found here  and in the explanations and rules document . ​​​​​​​​​​​

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    Freiberg, Germany