Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate
2011-08-02
2011-08-02
Kugel, Timothy J. (Department: 1765)
Earth boring, well treating, and oil field chemistry
Well treating
Contains organic component
C166S270100, C166S275000, C166S305100, C507S269000, C507S277000
Reexamination Certificate
active
07989400
ABSTRACT:
The invention provides a method for treating a subterranean formation penetrated by a wellbore, the method comprising the steps of formulating a treatment fluid and introducing the treatment fluid through the wellbore. The treatment fluid comprises water; diutan; and a sufficient amount of salt to increase the density of the treatment fluid to at least 8.5 lb/gal, wherein at least 50% by weight of the salt is selected from the group consisting of: bromide salts, non-bromide salts having a higher salting-in effect than bromide according to the Hofmeister series as measured by the salt's effect on the cloud point of poly(ethylene oxide) that has a molecular weight of 4×106, and any combination in any proportion thereof. The invention also provides a treatment fluid for use in a subterranean formation penetrated by a wellbore, the treatment fluid comprising: water; diutan; and a sufficient amount of salt to increase the density of the treatment fluid to at least 8.5 lb/gal, wherein at least 50% by weight of the salt is selected from the group consisting of: bromide salts, non-bromide salts having a higher salting-in effect than bromide according to the Hofmeister series as measured by the salt's effect on the cloud point of poly(ethylene oxide) that has a molecular weight of 4.106, and any combination in any proportion thereof.
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Pauls Richard W.
Robb Ian D.
Baker & Botts LLP
Halliburton Energy Service,s Inc.
Kent Robert A.
Kugel Timothy J.
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