Cover: Oilfield Review Spring 2000
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Editorial: Is Perforating a Mature Technology?
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Many new discoveries are highly productive fields in ultradeep water where the environment creates difficult well-construction conditions. We review the challenges of deepwater operations, including drilling in unconsolidated sediments, water-flow hazard identification, pore-pressure prediction, cementing and subsea flow boosting. Case studies demonstrate proven methods and new techniques that solve these problems and ensure cost-effective, safe and efficient operations.
Rotary steerable drilling systems allow us to drill specialized well trajectories, including horizontal, extended-reach and other complex profiles, while avoiding the problems of sliding during conventional directional drilling. We explain how rotary steerable systems work and through field examples demonstrate the increase in penetration rate and improvement in reliability that are obtained with the latest generation of these rotary steerable tools.
As produced water increases or breaks through at the wrong place, it creates major problems in oil and gas operations. Excess water reduces productivity, increases corrosion and forces operators to expand water treatment and disposal systems. Through case studies we show how complex water problems are being diagnosed and monitored, so that proven solutions can be applied to reduce water production, decrease costs and improve hydrocarbon output.
A practical, objective-oriented design approach helps operators better apply deep-penetrating charges to bypass invasion, big-hole charges for fracture stimulation or sand-control gravel packing, and new methods that maximize perforation flow area and optimize shot spacing to prevent sanding. We review perforating physics, explosive shaped charges, damage mitigation, design criteria, strategies and conveyance choices for high-performance perforated completions.
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