Schlumberger

Oilfield Review Autumn 2004


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Cover: Oilfield Review Autumn 2004 Download file (0.10 MB PDF)
Editorial: Can Our Industry Help Reduce C02 Emissions? Download file (0.04 MB PDF)

Profiling and Quantifying Complex Multiphase Flow

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Profiling and Quantifying Complex Multiphase Flow

Accurate measurement of multiphase flow in highly deviated and horizontal wells has long been a daunting task. The newest production logging tool resulted from a comprehensive approach to hardware design, data-interpretation methodology and datavisualization software. Case histories from the Middle East highlight the effectiveness of this new tool and its associated cost savings.


Drilling Straight Down

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Drilling Straight Down

Complicated directional drilling operations with rotary steerable systems frequently garner attention, but rotary steerable systems also improve seemingly mundane vertical drilling operations. A new rotary steerable system for vertical drilling maintains verticality and returns inclined holes to verticality. This system rotates continuously with the drillstring to provide superior borehole quality, high rate of penetration and minimal risk of mechanical sticking.


Optimizing Frac Packs

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Migrating hydraulic fracture growth into shales

This article discusses a more reliable method for determining fracture-closure pressure and other criteria, such as treatmentfluid selection, which are critical in tip-screenout fracturing and gravel packing. Experience gained from completing wells in the ultradeepwater Aconcagua and Camden Hills fields of the Gulf of Mexico demonstrates how engineers designed and placed highly conductive propped fractures to reduce completion damage, or skin, from 10 to less than 5.


Advancing Downhole Conveyance

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MaxTRAC section with arm extended and one with arms retracted

The requirements for conveyance—transporting tools and equipment into a wellbore—have become more demanding as well trajectories have become more complex and well depths have increased. This article reviews conveyance methods, highlighting ultrastrong wireline cables for deep vertical wells and a downhole tractor for high-angle or horizontal wells.


CO2 Capture and Storage: A Solution Within

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CO2 Capture and Storage

Oil and gas have long been the low-cost fuels of choice. However, the burning of fossil fuels results in carbon dioxide [CO2] emission, which is the primary focus in the current debate on global warming. Many scientists believe that the capture and subsurface storage of CO2 hold promise as a way to offset emissions, and to enhance productivity and hydrocarbon recovery. We review CO2 capture and storage, and give examples of how government, institutional and industry collaboration benefits both the environment and the oil field.


Reversible Drilling-Fluid Emulsions for Improved Well Performance

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Test apparatus

Oil-external drilling fluids are often used to optimize drilling conditions, yet they may be difficult to clean up and may hinder well productivity. In this article, we describe several examples showing how one operator is using reversibleemulsion drilling fluids to improve well cleanup and minimize formation damage.


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