US Patent 7318475 Matrix acidizing high permeability contrast formations

Patent 7318475 was granted and assigned to Schlumberger on January, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Schlumberger

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7318475

Date of Patent

January 15, 2008

Patent Application Number

11198422

Date Filed

August 5, 2005

Patent Primary Examiner

‌

George Suchfield

Patent abstract

A method for stimulating thick or multilayered heterogeneous or homogeneous formations in a single trip without packers involves perforating with tubing conveyed perforation, then injecting a self-diverting acid, then moving the tubing string and perforating at a new location, and then injecting additional self-diverting acid. The sequence may be repeated. The acid is preferably a viscoelastic diverting acid. The self-diverting acid may be alternated with conventional treatment fluid. The job is designed to treat the least permeable zone(s) first and maximizes acid efficiency.