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A combination of propellant and underbalanced tubing-conveyed perforating enhanced the hydraulic fracturing treatment of a well in the foothills of western Alberta.
Petromet Resources Ltd., Calgary, Wild River No. 6-20 well had previously been perforated in another zone.
Canadian Completion Services (CCS), Calgary, says most wells in the area prior to fracturing are typically pretreated by extreme overbalance perforating (EOB).
EOB uses a nitrogen column and a small amount of liquid in the tubing, pressured to well in excess of the formation fracture gradient. When the perforating gun fires, the fluid and nitrogen rush toward the formation at a very …