CASE STUDY StackFRAC system improves production from a deep sandstone reservoir BACKGROUND The pre-Khuff Unayzah gas reservoir in Saudi Arabia consists of sandstone units Unayzah-A and -B/C separated by variable-thickness siltstone units and shale barriers. Significant natural gas reserves are available for exploitation from these formations, but their highly abrasive nature and low permeability makes wells difficult to drill and produce tri

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