Horizontal drilling proves zone-specific application in Iranian carbonate reservoirs

The National Iranian South Oil Co. (NISOC), Ahwaz, Iran, has applied horizontal drilling technology to the country's carbonate and sandstone reservoirs to increase recoverable reserves, well productivity, and production efficiency.The company drilled the first horizontal well in 1992. It drilled 20 horizontal wells in 1993 and by 1999 had drilled 68 horizontal wells in Iranian oil and gas fields.1 Click here to enlarge imageIn one application, NISOC evaluated horizontal wells in the Cretaceous carbonate reservoirs of a southern Iranian oil field (Fig. 1).2 The field has upper (reservoir I1) and lower (reservoir II2) carbonate intervals that are separated by an impermeable formation.A...

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