Method of acidizing wells

Claim 1

A METHOD OF ACIDIZING A CALCAREOUS SUBTERRANEAN FORMATION TRAVERSED BY A WELL CONSISTING OF ADMIXING, WITH AN AQUEOUS ACIDIC FLUID SELECTED FROM THE CLASS CONSISTING OF SOLUTIONS OF (1) WATER AND ACID AND (2) BRINE AND ACID, A POLYSACCHARIDE COMPRISING COMBINED GROUPS OF: MANNOSE, GLUCOSE, POTASSIUM GLUCURONATE, AND ACETYL GROUPS IN THE MOLAR RATIO OF ABOUT 3:3:2:2, WHICH HAS A POTASSIUM CONTENT OF ABOUT 5.4% OF WHICH NO MORE THAN 0.3% IS DERIVED FROM POTASSIUM CHLORIDE, CONTAINS NOT OVER ABOUT 0.4% NITROGEN AND NOT OVER ABOUT 0.2% PHOSPHORUS, WHICH HAS A SPECIFIC ROTATION OF ABOUT ZERO, HAS A PH VALUE OF BETWEEN ABOUT 7 AND ABOUT 8.5 IN AN AQUEOUS CONCENTRATION OF FROM ABOUT 0.1 TO 1.0%, AND HAS A MOLECULAR WEIGHT OF AT LEAST ABOUT 1 X 10**6, TO MAKE AN ACIDIZING COMPOSITION OF DECREASED FLUID LOSS, OF RETARDED ATTACK OF CALCAREOUS ROCK, AND OF INCREASED RESISTANCE TO DETERIORATION BY HEAT; INJECTING THE ACIDIZING COMPOSITION SO MADE DOWN THE WELLBORE OF THE WELL AT SUFFICIENT PRESSURE TO FORCE AT LEAST A PORTION THEREOF INTO THE FORMATION INTO CONTACT WITH THE EXPOSED FACES OF THE FORMATION TO EFFECTUATE A CONTROLLED ATTACK BY THE ACID ON THE CALCAREOUS FORMATION.

Claim 2

A METHOD OF ACIDIZING A CALCAREOUS SUBTERRANEAN FORMATION TRAVERSED BY A WELL CONSISTING OF ADMIXING, WITH AN AQUEOUS ACIDIC FLUID SELECTED FROM THE CLASS CONSISTING OF SOLUTIONS OF (1) WATER AND ACID AND (2) BRINE AND ACID, A POLYSACCHARIDE COMPRISING COMBINED GROUPS OF: MANNOSE, GLUCOSE, POTASSIUM GLUCURONATE, AND ACETYL GROUPS IN THE MOLAR RATIO OF ABOUT 3:3:2:2, WHICH HAS A POTASSIUM CONTENT OF ABOUT 5.4% OF WHICH NO MORE THAN 0.3% IS DERIVED FROM POTASSIUM CHLORIDE, CONTAINS NOT OVER ABOUT 0.4% NITROGEN AND NOT OVER ABOUT 0.2% PHOSPHORUS, WHICH HAS A SPECIFIC ROTATION OF ABOUT ZERO, HAS A PH VALUE OF BETWEEN ABOUT 7 AND ABOUT 8.5 IN AN AQUEOUS CONCENTRATION OF FROM ABOUT 0.1 TO 1.0%, AND HAS A MOLECULAR WEIGHT OF AT LEAST ABOUT 1 X 10**6, TO MAKE AN ACIDIZING COMPOSITION OF DECREASED FLUID LOSS, OF RETARDED ATTACK OF CALCAREOUS ROCK, AND OF INCREASED RESISTANCE TO DETERIORATION BY HEAT; INJECTING THE ACIDIZING COMPOSITION SO MADE DOWN THE WELLBORE OF THE WELL AT SUFFICIENT PRESSURE TO FORCE AT LEAST A PORTION THEREOF INTO THE FORMATION INTO CONTACT WITH THE EXPOSED FACES OF THE FORMATION TO EFFECTUATE A CONTROLLED ATTACK BY THE ACID ON THE CALCAREOUS FORMATION.