Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Patent
1999-06-02
2000-12-26
Tucker, Philip
Earth boring, well treating, and oil field chemistry
Well treating
Contains organic component
271903, 271922, 271923, 271925, 166300, 166308, C09K 300, E21B 4327
Patent
active
061659479
ABSTRACT:
A chemical system and method to stop or minimize fluid loss during completion of wells penetrating hydrocarbon formations are provided. The inventions relates to formulating a highly stable crosslinked hydroxyethyl cellulose (HEC), control released viscosity reduction additives, and user friendly packaging. The chemical system contains a linear HEC polymer solution, a low solubility compound which slowly raises the fluid pH, a chelating agent which further increases the pH level beyond the equilibum achievable by the low solubility compound, a metal crosslinker which crosslinks HEC at elevated pH, a crosslink delaying agent which allows fluid viscosity to remain low until the fluid reaches the subterranean formation, and optionally an internal breaker. The chemical additives are packaged as an integrated pallet and transported to a field location which allows operators to conveniently mix them before pumping. There is also provided a dry granulated crosslinked polysaccharide for use as a fluid loss control agent.
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Chang Frank F.
Parlar Mehmet
Bami-Jamali Maryam
Tucker Philip
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