E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/04 (2006.01) E21B 34/06 (2006.01) E21B 43/267 (2006.01)
Patent
CA 2339531
A method and apparatus for fracturing a formation or gravel packing a borehole extending through an unconsolidated subterranean zone in a formation includes a screen assembly having a length adapted for disposal adjacent the unconsolidated subterranean zone and includes a plurality of screens mounted on a base member with adjacent base members being connected by a sub having an aperture in the wall thereof. A flow- control service assembly is disposed within the bore of the screen assembly and includes an outer tubular member and an inner tubular member. The outer tubular member includes a plurality of ports that communicate with the apertures in the screen assembly. The apertures in the screen assembly are disposed along the length of screen assembly at predetermined intervals. The inner tubular member and outer tubular member form an inner annulus, the outer tubular member and screen assembly form a medial annulus, and the screen assembly forms an outer annulus with the wall of the borehole. Barriers are placed around the ports on the outer tubular member to prevent the formation of gravel bridges across the inner annulus. The inner annulus provides alternative flow paths around the ports upon the ports becoming closed to fluid flow such as by bridges. In operation, fluids, such as fracing fluids or a gravel slurry, is pumped down the inner annulus, through the ports in the outer tubular member and apertures in the screen assembly and into the outer annulus prior to passing through the perforations into the formation. Return fluid may pass through the screens, through the medial annulus and into the flowbore of the inner tubular member to flow to the surface. The fluid flowing through the inner annulus passes through the ports and apertures into the outer annulus substantially uniformly along the length of the screen assembly thereby creating fractures uniformly along the unconsolidated subterranean zone from top to bottom.
Dusterhoft Ronald Glen
Hailey Travis Thomas Sr.
Halliburton Energy Services Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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