Patent ID: 9702217
Date: 2017-07-11
CPC Classifications: C09K,E21B

Claim:
1. A sealing system comprising an article including a swellable composition comprising an ion reducing material disposed with the swellable composition, the ion reducing material comprising one or more of the following: a chelating agent; a cation precipitating agent; or an anion precipitating agent, the ion reducing material being present in an amount of about 0.1 wt. % to about 40 wt. % based on the total weight of the swellable composition; wherein the chelating agent is effective to bind a cation of one of the following metals in a fluid that contacts the sealing system: calcium; magnesium; chromium; iron; cobalt; tungsten; nickel; copper; zinc; or aluminum; and the chelating agent is one or more of the following: ethylenediamine; porphine; porphyrin; diethylene triamine pentaacetic acid; ethylenediamine-N,N-disuccinic acid; nitrilotriacetic acid; ethylene glycol tetraacetic acid; hydroxyethylethylenediaminetriacetic acid; ammonium acetate; poly(gamma-glutamic acid); or sodium citrate; the cation precipitating agent is a water soluble inorganic salt comprising a single valent cation and an anion that is one or more of the following: C the anion precipitating agent is effective to reduce a concentration of one or more of the following anions in a fluid: a halide; nitride; sulfate; formate; carbonate; acetate; or propionate.