Darrell J Davis

US Patent:

20110226479, Sep 22, 2011

Filed:

Jan 27, 2011

Appl. No.:

13/014778

Inventors:

Philipp Tippel - Graz, AT
Elizabeth W.A. Morris - Aberdeen, GB
Curtis L. Boney - Houston TX, US
Jason Swaren - Sugar Land TX, US
John Lassek - Katy TX, US
Ricardo Ariza - Conroe TX, US
Desmond E. Rees - Tyler TX, US
David Ryan Simon - Conroe TX, US
Michael A. Dardis - Richmond TX, US
Darrell P. Davis - Longview TX, US

International Classification:

E21B 43/16

US Classification:

1663051

Abstract:

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.