Oilfield Review Schlumberger
Executive Editor Mark A. Andersen
Advisory Editor Lisa Stewart
Senior Editor Matt Varhaug
Editors
Rick von Flatern Vladislav Glyanchenko Tony Smithson
Michael James Moody
Contributing Editors Rana Rottenberg Glenda de Luna David Allan
Design/Production Herring Design Steve Freeman
Illustration Tom McNeff Mike Messinger George Stewart
Printing Wetmore Printing Company Curtis Weeks
34 Downhole Temperatures from Optical Fiber
For more than a decade, fiber-optic technology has slowly been integrated into an expanding array of oilfield applications. In addition to being a medium for transmitting data and commands, optical fiber is an intrinsic thermometer that can be sampled along its entire length. This article describes how operators use pulses of light to monitor downhole temperature and thermal processes.
24 Shining a Light on Coiled Tubing
In the oil field, optical fiber isn’t just for monitoring pumps and production. Fiber-optic technology is now used in a wide range of coiled tubing applications, delivering downhole measurements in real time and tying them to depth. With this capability, operators can better respond to deviations from their treatment plans.
4 Nuclear Magnetic Resonance Comes Out of Its Shell
Nuclear magnetic resonance logging provides basic information about reservoir fluids. Newly developed techniques offer improved fluid information and in situ fluid properties, including oil viscosity. Two-dimensional NMR maps can be generated that give petrophysicists a powerful new tool to better under- stand reservoir rocks and the fluids they hold.
On the cover:
Remote sensing utilizes satellite images to evaluate the Earth’s surface. In the E&P industry, this technique helps assess risk factors for seismic survey acquisition in remote areas. Here, a Landsat 7 satellite scans the surface of Egypt’s Western Desert, using visible and infrared sensing bands to discrimi- nate lithology. The Landsat 7 satellite graphic is provided courtesy of the US Geological Survey.
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