Cover: Oilfield Review Summer 2008
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Editorial: Inducing the Next Developments
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In recent years, operators have looked to increased reservoir contact as a way to drain their reservoirs more efficiently. Hydraulic fracturing is often a key component of this strategybut has proved uneconomic when used with certain types of completions. This article describes efforts to overcome that financial challenge through efficiency-enhancing fracturing techniques and tools.
Groundwater constitutes a predominant share of the Earth’s supply of drinkable water. Characterization of subsurface aquifers is essential for managing and sustaining our supply of fresh water. Advanced logging, sampling and modeling techniques—some borrowed or modified from established oilfield applications—are proving vital for evaluating and managing this precious resource.
Under certain conditions, unconsolidated sand can be remobilized and forced upward through overlying impermeable layers. Theseinjected sands, called injectites, can form excellent pay zones and enhance reservoir connectivity. Geologists and other E&P professionals are using surface exposures of injectites, along with core, borehole images and surface seismic data, to understand the shape and distribution of injectites in the subsurface. Examples from the USA, the North Sea and the Gulf of Guinea show what injectites look like and how they can affect reservoir development.
Companies with reserves of natural gas in remote locations can now move it to consumers in distant markets. This gas, once considered stranded, is liquefied and transported as liquefied natural gas (LNG) in large, custom-designed vessels. New technologyis transforming every link in the LNG chain, from highly efficient liquefaction plants to new, offshore import terminals.
A new triaxial induction resistivity service overcomes many of the shortcomings of previous-generation induction tools. Although resistivity logs have been used to identify oil and gas deposits for more than 80 years, it is now possible to properly evaluate electrically anisotropic reservoirs and more accurately measure resistivity in high-angle wells. In addition, high-quality structural dipmeter data far from the wellbore are a direct output with this new service.
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