Tin/cerium compounds for lignosulfonate processing
OwnerBharat B. Patelinventor
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Abstract
This invention concerns tin-, cerium-, and base-treated tin-bearing lignosulfonates, a process for their preparation from calcium lignosulfonate, and a process for the use thereof as drilling fluid additives.
Claims10
A drilling fluid additive package comprising a base-treated tin-bearing lignosulfonate and a component selected from the group consisting of suspending agents, conditioning agents, viscosifiers, oxygen scavengers, corrosion inhibitors, and bactericides.
A drilling fluid composition comprising a clayey mineral selected from the group consisting of bentonite, attapulgite, sepiolite and hectorite, water, and an effective dispersing amount of base-treated tin-bearing lignosulfonate.
A drilling fluid composition comprising a clayey mineral selected from the group consisting of bentonite, attapulgite, sepiolite and hectorite, water, and an effective dispersing amount of base-treated tin-bearing lignosulfonate prepared according to a process comprising the steps of:
- (a) contacting aqueous calcium lignosulfonate and a sulfate reactant comprising tin sulfate to produce an aqueous tin-bearing lignosulfonate and a calcium sulfate precipitant:
- (b) separating said calcium sulfate precipitant from said aqueous tin-bearing lignosulfonate;
- and
- (c) contacting said aqueous tin-bearing lignosulfonate and an alkali metal base to produce a base-treated tin-bearing lignosulfonate.
A drilling fluid composition comprising a suspension of a clayey mineral selected from the group consisting of bentonite, attapulgite, sepiolite and hectorite, water, and an effective dispersing amount of base treated tin-bearing lignosulfonate prepared according to a process comprising the steps of:
- (a) contacting aqueous calcium lignosulfonate and a sulfate reactant comprising tin sulfate to produce an aqueous tin-bearing lignosulfonate and a calcium sulfate precipitant;
- (b) separating said calcium sulfate recipitant from said aqueous tin-bearing lignosulfonate;
- and
- (c) contacting said aqueous tin-bearing lignosulfonate and sodium hydroxide to produce a base-treated tin-bearing lignosulfonate.
A drilling fluid composition comprising a suspension of a clayey mineral selected from the group consisting of bentonite, attapulgite, sepiolite and hectorite, water, and an effective dispersing amount of base-treated tin-bearing lignosulfonate prepared according to a process comprising the steps of:
- (a) contacting aqueous calcium lignosulfonate and a sulfate reactant comprising tin sulfate to produce an aqueous tin-bearing lignosulfonate and a calcium sulfate precipitant;
- (b) separating said calcium sulfate precipitant from said aqueous tin-bearing lignosulfonate;
- (c) contacting said aqueous tin-bearing lignosulfonate and sodium hydroxide to produce a base-treated tin-bearing lignosulfonate;
- and
- (d) drying said base-treated tin-bearing lignosulfonate to produce a solid base-treated tin-bearing lignosulfonate.
A method for making a drilling fluid comprising mixing a suspension comprising water, a clayey mineral selected from the group consisting of bentonite, attapulgite, sepiolite, and hectorite, and a lignosulfonate selected from the group consisting of tin-bearing lignosulfonates, cerium-bearing lignosulfonates, and base-treated tin-bearing lignosulfonates.
Dependencies are inferred from the claim text.