Crush resistant buoyant ball sealers
AssigneeFairmount Santrol, Inc.
InventorsHuaxiang Yang, An Thien Nguyen, Vinay Mehta
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Abstract
A perforation ball sealer for temporarily plugging a perforation in an oil or gas well comprises a polymer foam core and a shell surrounding the core formed from a solid or essentially solid second polymer. Both the core and the shell are made from slowly water-soluble polymers.
Claims8
A perforation ball sealer for use in temporarily plugging a perforation in an oil or gas well, the perforation ball sealer comprising a polymer foam core made from a first polymer and a shell surrounding the core formed from a solid or essentially solid second polymer, wherein both the first and second polymers are slowly water-soluble, and further wherein the ball sealer exhibits a density of 1.1 g/cc or less and a crush strength of 1,000 psi (˜69 dyne/cm) or more when dry.
Dependencies are inferred from the claim text.