Cover: Oilfield Review Spring 2003
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Borehole seismic surveys help oil and gas companies reduce exploration and development risk and enhance field value. Advances in borehole seismic acquisition, in the form of a new, versatile downhole receiver array and innovative source-positioning system, help geophysicists acquire large amounts of high-quality data cost-effectively. Case studies demonstrate how borehole seismic surveys illuminate targets and hazards ahead of the bit, produce images while anchored inside drillpipe, pin-point small-scale structures for development-wellplanning, characterize reservoir fluid content and image in three dimensions.
Advances in downhole instrumentation, telemetry and data processing are bringing real-time borehole visualization closer to the field. On-site drilling and petrophysical teams make fast, accurate operational decisions based on intuitive visual interpretations of the downhole reservoir environment. Wellbore construction and placement are optimized for maximum efficiency. This article reviews the basic technology of LWD imaging tools and techniques, and explores examples of how operators are using real-time imaging.
Novel well-completion techniques prevent sand influx without using mechanical screens. When engineered and executed carefully, these methods reduce cost and risk by eliminating conventional sand-control equipment and rig operations. This approach helps operators rehabilitate production and tap bypassed zones to improve reserve recovery; it also maintains fullbore access across pay intervals. We review associated rigless technologies and screenless applications in Saudi Arabia, the Gulf of Mexico and Italy.
Geoscientists are using a growing number of downhole tools to examine oil and gas reservoir sedimentology. New data-analysis and visualization software, coupled with new interpretation methods, exploit the expanding capabilities of borehole-imaging technology. Unprecedented levels of detail and sophistication improve reservoir models by incorporating sedimentological models, surface and subsurface analogs, and more detailed data and analysis. This article focuses on the contribution of today's borehole imaging tools to clastic reservoir optimization.
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