Wells – Processes – Chemical inter-reaction of two or more introduced materials
Reexamination Certificate
2007-06-28
2009-12-22
Suchfield, George (Department: 3676)
Wells
Processes
Chemical inter-reaction of two or more introduced materials
C166S308200, C166S308300, C507S244000, C507S245000, C507S259000, C507S267000, C507S277000, C507S921000
Reexamination Certificate
active
07635028
ABSTRACT:
Compositions and methods are given for delayed breaking of viscoelastic surfactant gels inside formation pores, particularly for use in hydraulic fracturing. Breaking inside formation pores is accomplished without mechanical intervention or use of a second fluid. Acidic internal breakers such as sulfuric acid and nitric acid are used. The break may be accelerated, for example with a free radical propagating species, or retarded, for example with an oxygen scavenger.
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Abad Carlos
Bui Toan
Li Leiming
Lin Lijun
Cate Dave
Nava Robin
Rutherford Charlotte
Schlumberger Technology Corporation
Suchfield George
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