Ball sealer diversion of matrix rate treatments of a well

E - Fixed Constructions – 21 – B

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E21B 33/13 (2006.01) E21B 33/068 (2006.01) E21B 33/138 (2006.01) E21B 43/25 (2006.01) E21B 43/26 (2006.01)

Patent

CA 1076023

ABSTRACT OF THE INVENTION A method for sequential treatment of formation strata when treating fluid is pumped into a well at a matrix rate by temporarily closing perfora- tions in the well casing. The perforations are closed by ball sealers injected into the well during the treatment. The ball sealers are sized to plug the perforations and have a density less than the density of the treating fluid. The treating fluid is injected at a rate which transports the ball sealers to the perforations but which is sufficiently low to prevent formation fracture.

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