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AssigneeSchlumberger Technology Corporation
InventorsCurtis L. Boney, Jason Swaren, John Lassek, Ricardo Ariza, Desmond E. Rees, David Ryan Simon, Michael A. Dardis, Darrel P. Davis
Estimating the term…
In downhole treatments in the oilfield, ball sealers seated in perforations may not fully seal and may leak fluid through gaps and asperities between the balls and the perforations. A method is given for improving the sealing of ball sealers in perforations by adding a sealing agent that forms a plug in the gaps and severely restricts or eliminates fluid flow. The sealing agent is preferably degradable or soluble, malleable fibers slightly larger than the gaps. Optionally, the particles may be non-degradable, rigid, of different shapes, and smaller than the gaps but able to bridge them. Mixtures of sealing agents may be used. The sealing agent may be added with the ball sealers, after the ball sealers, or both.
A method for improving the seal of ball sealers seated in holes in a casing in a well penetrating a subterranean formation, wherein there is at least one gap between an outer boundary of a ball sealer and an inner boundary of a hole in which it is seated, comprising injecting a sealing agent comprising particles that form a plug that inhibits fluid flow through the gap.
A method for improving the seal of a ball seated in an orifice in a tool in a well penetrating a subterranean formation, wherein there is at least one gap between the outer boundary of the ball and the inner boundary of the orifice in which it is seated, comprising injecting a sealing agent comprising particles that form a plug that inhibits fluid flow through the gap.
A composition for diverting fluid from perforations comprising a carrier fluid, a plurality of ball sealers, and a sealing agent comprising particles that form a plug that inhibits fluid flow through a gap between a seated ball sealer and a perforation.
Dependencies are inferred from the claim text.