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Speaker: Colin Sayers, Schlumberger (retired)
Co-Authors: Adam Koesoemadinata, Sagnik Dasgupta, Vasudhaven Sudhakar and Richard Hearn, Schlumberger

Producing hydrocarbons from unconventional reservoirs involves drilling thousands of wells. It is important, therefore, that these wells be drilled as efficiently as possible. While drilling efficiency and rate of penetration depend on factors that can be controlled by the driller such as borehole diameter, pressure in the borehole, weight on bit, revolutions per minute, and torque, they depend also on formation properties such as the geomechanical properties of the rock, pore pressure, and in situ stress. We describe a workflow for predicting such formation properties using the results of seismic inversion of properly processed prestack seismic data. Particularly important to predicting drilling efficiency and rate of penetration is estimating confined compressive stress, which varies with well trajectory and pressure in the borehole. The results presented enable optimizing well locations and borehole trajectories before wells are drilled.

Speaker Biography: Colin Sayers, Schlumberger (retired)
Colin Sayers received a B.A. in physics from the University of Lancaster, UK, and a D.I.C. and Ph.D. in physics from Imperial College, London, UK. He has previously worked for Shell in the Netherlands and the UK and for Schlumberger in the UK and USA. He currently holds a position as an Adjunct Professor in the Department of Earth and Atmospheric Sciences, University of Houston. He is a member of AGU, EAGE, GSH, SEG, and SPE, a member of the Research Committee of SEG, and has served on the editorial boards of the International Journal of Rock Mechanics and Mining Science, Geophysical Prospecting, and The Leading Edge. In 2010 he presented the SEG/EAGE Distinguished Instructor Short Course “Geophysics under stress: Geomechanical applications of seismic and borehole acoustic waves.” In 2013 he was awarded honorary membership of the Geophysical Society of Houston “in recognition and appreciation of distinguished contributions to the geophysical profession.” He shared an award for best paper in The Leading Edge in 2013.

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