Shale inhibition

Details Shale inhibition Shale inhibition

2005-11-04

2009-10-20

Kugel, Timothy J. (Department: 1796)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

C175S065000, C516S077000, C507S119000

Reexamination Certificate

active

07605112

ABSTRACT:
A method of shale inhibition comprises adding a two-phase polymer system of a water soluble copolymer of vinyl pyrrolidone and dimethylaminopropyl methacrylamide and in-situ formed water-insoluble particles of said copolymer, or, alternatively, a water-soluble copolymer of methylvinyl ether and maleic anhydride, into a drilling well fluid under aqueous, high temperature, high salinity conditions.

REFERENCES:
patent: 3654164 (1972-04-01), Sperry
patent: 6020289 (2000-02-01), Dymond
patent: 6800696 (2004-10-01), Saito
patent: 2005/0101512 (2005-05-01), Shah et al.
PCT, International Search Report, PCT/US2006/042647 (dated Apr. 25, 2007; published May 18, 2007).
PCT, International Preliminary Report on Patentability, PCT/US2006/042647 (May 15, 2008).
Clark, R.K., “Applications of Water-Soluble Polymers as Shale Stabilizers in Drilling Fluids,”Advances in Chemistry Series Water-Soluble Polymers Beauty with Performance, American Chemical Society, Washington, D.C., pp. 171-181 (1986).

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