Wells – Processes – Specific propping feature
Reexamination Certificate
2005-12-21
2008-07-15
Suchfield, George (Department: 3676)
Wells
Processes
Specific propping feature
C166S283000, C166S300000, C166S302000, C166S308200, C175S072000, C507S124000, C507S132000, C507S230000, C507S245000
Reexamination Certificate
active
07398826
ABSTRACT:
Well treatment is disclosed that includes injecting a well treatment fluid with insoluble polyol polymer such as polyvinyl alcohol (PVOH) dispersed therein, depositing the insoluble polymer in the wellbore or an adjacent formation, and thereafter dissolving the polymer by reducing salinity and/or increasing temperature conditions in the environment of the polymer deposit. The method is disclosed for filter cake formation, fluid loss control, drilling, hydraulic fracturing and fiber assisted transport, where removal of the polyol at the end of treatment or after treatment is desired. The method is also disclosed for providing dissolved polyol as a delayed breaker in crosslinked polymer viscosified systems and viscoelastic surfactant systems. Also disclosed are well treatment fluids containing insoluble amorphous or at least partially crystalline polyol, and a PVOH fiber composition wherein the fibers are stabilized from dissolution by salinity.
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Encylcopeida of Chemical Technology, 3rd Edition, vol. 23, John Wiley and Sons, pp. 848-865 (1983) By Kirk, R.E. and Othmer, D.F.
Baser Belgin
Boney Curtis L.
Bulova Marina
Chen Yiyan
Fredd Christopher N.
Cate David
Mitchell Thomas O.
Nava Robin
Schlumberger Technology Corporation
Suchfield George
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