Polymer-enhanced foamable drilling fluid

   
   

A foamable drilling fluid is provided which includes an aqueous solvent; a surfactant; and a polysaccharide preferably derived from a galactomannan gum. The foamed drilling fluid includes a liquid phase consisting of the aqueous solvent, polysaccharide and surfactant, and a gas phase of air, nitrogen, natural gas, CO.sub.2 and mixtures thereof. The drilling fluid is stable in the presence of crude oil and salt and environmentally friendly.

Se proporciona un líquido que perfora espumoso que incluye un solvente acuoso; un surfactant; y un polisacárido derivó preferiblemente de una goma del galactomannan. El líquido que perfora hecho espuma incluye una fase líquida que consiste en el solvente acuoso, polisacárido y surfactant, y una fase de gas del aire, del nitrógeno, del gas natural, de CO.sub.2 y de mezclas de eso. El líquido que perfora es estable en la presencia del petróleo crudo y de la sal y ambientalmente amistoso.

 
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