METHOD OF PRODUCING LIGNOSULFONATE REAGENT FOR DRILLING FLUID TREATMENT Russian patent published in 1997 - IPC

Abstract RU 2098447 C1

FIELD: petroleum and gas industry. SUBSTANCE: method involves heating the reaction mixture at 60-70 C at stirring followed by condensation at 80-95 C and neutralization with sodium hydroxide. Reaction mixture is taken at the following ratio of components, wt.-%: lignosulfonate 94-95; formalin 2-3, and sulfuric acid 3-4. Lignosulfonate reagent exhibits the enhanced effect on filtration and structure-mechanical property of clay fluids. EFFECT: improved method of reagent producing. 1 tbl

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RU 2 098 447 C1

Authors

Nigmatullina A.G.

Chezlov A.A.

Shamsutdinov R.D.

Mart'Janova S.V.

Piskareva L.A.

Dates

1997-12-10—Published

1995-06-06—Filed