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Stefan Vajda is Principal Research Scientist and now works in nuclear detectors at the Schlumberger PTC in New Jersey. He holds an MS degree from the University of Bucharest, Romania, and a PhD degree from the Institute for Nuclear Physics and Engineering, Bucharest/Magurele, Romania, both in physics. Stefan joined the company in 1984, working as a research physicist in neutron and X-ray generators. He later worked on inorganic scintillator research, nuclear detectors and gamma ray spectroscopy. He built a gamma ray spectrometer for the NASA mission to asteroid 433 Eros, which was successfully completed in 2001. Stefan has written more than 40 papers and holds two patents.

Henri-Pierre Valero, Program Manager and Senior Research Scientist at SDR, Ridgefield, Connecticut, is involved in the development of algorithms for bore- hole acoustic tools. He joined the company in 1998 as a project engineer at Schlumberger KK, Fuchinobe, Sagamihara, Kanagawa, Japan, and worked on the development and implementation of sonic answer products until his transfer to SDR in 2004. Henri-Pierre holds a BS degree in science from Rennes University, France, an MS degree (Hons) in geoscience from l'Ecole Nationale Supérieure des Pétroles et Moteurs, Rueil-Malmaison, France, and a PhD degree (Hons) in geophysics from Institut de Physique du Globe de Paris, France.

Stephen Williams is Formation Evaluation Adviser for Norsk Hydro ASA in Bergen, Norway. He is responsible for planning, execution and follow-up of formation evaluation programs on the company’s wells around the world. He has held a number of formation evalua- tion positions since he joined Norsk Hydro in 1998. Before this, he spent 14 years with Schlumberger in various assignments in operations, technical manage- ment, training and management in North and South America, Europe, Scandinavia and the Middle East. Stephen earned BA and MA degrees in natural sci- ences from University of Cambridge in England.

Kenneth Winkler is a Principal Research Scientist at SDR, Ridgefield, Connecticut, working on microsonic principles, tools and interpretation techniques to pro- duce a high-resolution acoustic-velocity map of the borehole wall. His other projects include nonlinear acoustics, flow assurance and pore-pressure studies. He joined Schlumberger in 1979, setting up the SDR high-pressure rock properties laboratory. Since then, he has worked on various programs including geoacoustics, near-wellbore acoustics and high-resolu- tion microsonic imaging. Ken holds a BS degree in physics from Rensselaer Polytechnic Institute, Troy, New York, and MS and PhD degrees in geophysics from Stanford University, California. He has served as a Distinguished Speaker of SPWLA, and he was technical editor of SPE Formation Evaluation from 1993 to 1996. The author of many papers, he also holds several patents.

Murtaza Ziauddin, Schlumberger Principal Engineer at the Sugar Land Technology Center, works on matrix stimulation of sandstones and carbonates, CO2 seques- tration, hydraulic fracturing, and organic and inor- ganic scale. He led the development of Virtual Lab* geochemical simulation software for matrix acidizing, inorganic scale prediction and water-compatibility testing. He is involved in developing a predictive rheol- ogy model for polymer-base fracturing fluids and with acidizing models in StimCADE* well stimulation soft- ware and WellBook* software application for treat- ment design, execution and evaluation. Murtaza joined Schlumberger in 1997 after receiving a BS degree from the University of Houston, and a PhD degree from the University of Minnesota at Minneapolis, USA, both in chemical engineering. He has written many papers and holds several patents.

Wolfgang Ziegler, Principal Engineer for Schlumberger PTC, New Jersey, is currently working on nuclear detector development, focusing on high- temperature applications and new materials. He joined the company at SDR, Ridgefield, Connecticut, in 1992 to work on measurement concepts later imple- mented in EcoScope* multifunction logging-while- drilling tools and researching new detectors for oilfield applications. He transferred to PTC in 2000 and continued his involvement in those projects. Wolfgang earned a Diploma in physics from Mainz University, and a PhD degree in experimental nuclear physics from Darmstadt University, both in Germany.

Com ing in Oilfield Review

Naturally Fractured Reservoirs. The presence of natural fractures in reservoirs can make otherwise tight rock productive, but fractures can also negatively impact porous and permeable reservoirs. This article examines naturally fractured reservoirs, and how industry geoscientists and engineers detect, characterize and model them at various scales and throughout all stages of reservoir development.

Heavy Oil. Dwindling production of conventional oils, high prices and the need to augment reserves are revitalizing interest in heavy oil. This article reviews fluid properties of heavy oil and potential production scenarios, from mining to in-situ combustion. Case studies demonstrate techniques for characterizing heavy-oil reservoirs, determining the best recovery method, constructing and completing wells, and monitoring production.

Subsidence and Compaction. Subsidence above reservoirs may have enormous economic consequences, which may not be limited to damage to oilfield infra- structure. A large subsidence bowl may cause extensive damage to surface structures, particularly in low-lying areas. Compaction results from depleting formations that are mechanically weak; it is the cause of industry- related subsidence. The article describes the funda- mentals of compaction and subsidence, and includes case studies from several active fields.


Oilfield Review

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