Method and apparatus for sealing pipe perforations

Details Method and apparatus for sealing pipe perforations Method and apparatus for sealing pipe perforations

E - Fixed Constructions

21

B

E21B 33/13 (2006.01) E21B 33/138 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2049974

2049974 9111587 PCTABS00006 Ball sealers for flowing into casing perforation holes in a wellbore to selectively seal off those perforations. The ball sealers (22) are comprised of a spherical outer deformable shell (42) defining a central core portion filled with nondeformable particulate matter (46) which is sized small enough to flow with the shape of the deformable outer shell (42) and large enough so that as it consolidates under the force of fluid flow pressure, it will cause the outer shell to bridge over the perforation opening (18) when the force of fluid flowing into the casing (12) pushes the ball sealer (22) against and into the perforation opening (18). The particles (46) are also arranged so that when fluid flow is stopped, the particulate matter (46) will become unconsolidated to relax the bridge and permit the entrapped energy in the deformed outer shell (42) to expel the ball from the perforation opening.

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