Low toxicity shale hydration inhibition agent and method of use

Details Low toxicity shale hydration inhibition agent and method of use Low toxicity shale hydration inhibition agent and method of use

C - Chemistry, Metallurgy

09

K

C09K 8/18 (2006.01) C09K 8/035 (2006.01) C09K 8/04 (2006.01) E21B 21/14 (2006.01)

Patent

CA 2624737

A low toxicity composition and method of reducing the swelling of clay in well comprising circulating in the well a water-based fluid comprising a functionally effective concentration of the additive formed from the following reaction of a tertiary amine of the following general formula: (see formula I) wherein R1 and R2 are alkyl or hydroxyalkyl groups with one to three carbon atoms or combinations thereof, and R3 is a hydroxyalkyl group with one to three carbon atoms, with an alkylating agent of the following general formula: R-A wherein R is an alkyl radical with one to three carbon atoms, and A is an organic or inorganic anion selected from the group consisting of sulfate, phosphate, carbonate, and combinations thereof..

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