Underbalanced horizontal drilling improves productivity ///
Hugoton field, located in the Texas Panhandle, is one of the largest gas producers in the Lower-48 states. These shallow reserves have been exploited by drilling either vertical wells with air or long-reach horizontal wells with conventional overbalanced techniques. Due to low formation pressures – in the 600 psi range – depletion is a major issue. Wells drilled in overbalanced mode have not exhibited a consistent productivity trend.
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