wellbore completion, collar, method of completing a wellbore and system for use in fracturing a wellbore

摘要

borehole assembly with hole completion and fracturing methods therewith. a hole completion and method for use in fracturing multi-zone wells. a casing assembly having a plurality of casing pieces and one or more necklaces positioned to couple the casing pieces together. the collars may be a tubular body having an internal flow stroke, one or more fracture holes configured to provide fluid communication between an external collar surface and the internal flow stroke, one or more valve holes intersecting the fracture holes , one or more valve vents positioned to provide fluid communication between the valve holes and the internal flow stroke and one or more valves positioned in the valve holes to open and close the fracture holes. The valves are configured to open when a pressure differential is created between the fracture holes and the valve vents. The valve vent may be an annular space around the perimeter of the tubular body.