Drilling wells without damaging formations is the ideal scenario. But in horizontal wells, the concept of affordable damage—allowing some reduction in permeability as long as the well still produces to its full potential—is gaining approval in fluids design and management circles. At the heart of this new acceptance is a real understanding, based on recent investigations, of how drilling fluids affect well productivity.
Microbes harmful and helpful are found in reservoirs around the world. These microorganisms are increasingly being acknowledged for their ability to influence reservoir behavior. Long recognized as a source of hydrogen sulfide, the cause of reservoir souring, bacteria are now also being used to improve production microbial enhanced oil recovery.
Specialty chemicals used during oilfield operations have a major impact on well performance and ultimate reserve recovery. Customized products provide solutions to problems encountered throughout the lifetime of a field. Initiatives by manufacturers and service companies have greatly improved chemical quality and reliability, complementing the industry?s overall drive for greater efficiency and productivity.
Prediction of log responses has moved from tool design workbenches to log analyst workstations. More efficient computer programs and faster computation allow rapid simulation of measurements in very complex formations with invasion, dip and anisotropy. In horizontal and high-angle wells, models provide the only way to evaluate the unusual effects of formation geometry and resistivity variations on tool responses.
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