High temperature drilling fluids based on sulfonated...

Details High temperature drilling fluids based on sulfonated... High temperature drilling fluids based on sulfonated...

C - Chemistry, Metallurgy

09

K

31/21

C09K 8/36 (2006.01)

Patent

CA 1196488

ABSTRACT OF THE DISCLOSURE The present invention relates to sulfonated thermoplastic polymers which function as viscosification agents when added to oil-based drilling muds which are the fluids used to maintain pressure, cool drill bits, and lift cuttings from the holes in the drilling opera- tion for oil and gas wells. The sulfonated thermoplastic polymers have 5 to 100 milliequivalents of sulfonate groups per 100 grams of the sulfonated thermoplastic polymer, wherein the sulfonated groups are neutralized with a metallic cation or an amine or ammonium counterion. A polar cosolvent can optionally be added to the mixture of oil drilling mud and sulfonated polymer, wherein the polar cosolvent increases the solubility of the sulfon- ated polymer in the oil drilling mud by decreasing the strong ionic interactions between the sulfonate groups of the sulfonated polymer.

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