Cover: Oilfield Review Summer 2001
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Editorial: Intelligent Planning Reduces Nonproductive Drilling Time
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Weak or low-pressure formations must be cemented carefully to ensure zonal isolation and environmental protection. Enhanced cement slurries achieve the ultralight densities necessary to avoid formation fracturing and circulation losses during well construction and completion operations. Once set, ultralight cement attains the low permeability and high compressive strength necessary for wellbore integrity and zonal isolation.
An innovative way of acquiring marine seismic data produces dramatically improved images for detailed interpretation. With the new system, every step of marine acquisition has changed: receiver streamers are steered and positioned reliably and repeatedly; air-gun source controllers regulate source quality; signals are recorded at individual point receivers instead of in groups, for better noise reduction and signal enhancement. The resulting images are remarkably clear and are setting new standards for marine seismic data quality.
Drilling wells without incident is expensive enough, but encountering hazards can rapidly destroy a budget. A new process can mitigate drilling problems by gathering the right data in the right time frame and communicating this information to the right people. Case studies from the Gulf of Mexico and the Caspian and North Seas illustrate the effectiveness of this new drilling process in difficult drilling environments.
Until recently, stand-alone screens were the predominant sand-control measure for horizontal open holes. However, operators now gravel pack more of these wells because many screen-only completions have failed prematurely. This article reviews stand-alone screens, water packing, Alternate Path technology and damage removal, including wellbore displacements and simultaneous cleanup with water-base fluids. New tools, developments in oil-base fluids and emerging techniques like expandable screens are discussed.
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