SPECIAL REPORT: Hammer bits, underbalanced systems optimize Canyon sands drilling

Deepak M. Gala, Greg Hawley, Craig LagrandeurWeatherford International Ltd.HoustonData from wells drilled in 2008 to produce gas from the Canyon sands of the Val Verde basin of West Texas illustrate the effectiveness of hammer bits and underbalanced drilling.In these wells, underbalanced drilling minimized deviation problems and increased the rate of penetration (ROP) at least three times in comparison with conventional overbalanced drilling.The membrane-generated nitrogen drilling system provided a safe and economical means of energized-fluid drilling in hydrocarbon producing formations. Also an effective corrosion program counteracted the presence of oxygen in the drilling fluidTo reduc...

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