Acidizing a petrolific formation

Claim 1

A METHOD OF ACIDIZING A PETROLIFEROUS FORMATION CONTAINING CALCAREOUS ROCK TRAVERSED BY A WELL WHICH CONSISTS ESSENTIALLY OF THE STEPS OF (1) ADMIXING WITH A LIQUID SELECTED FROM THE GROUP CONSISTING OF BRINE, WATER, AND EMULSIONS OF OIL AND WATER AND OF OIL AND BRINE, AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC, FORMIC, ACETIC, SULFAMIC, AND ANHYDRIDES AND MIXTURES THEREOF IN AN AMOUNT BETWEEN ABOUT 1% BY WEIGHT AND THAT NECESSARY TO MAKE A SATURATED SOLUTION THEREOF, AND A RETARDANT TO ACID ATTACK ON CALCAREOUS ROCK SELECTED FROM THE GROUP CONSISTING OF DIALKYL-SUBTITUTED CARBOXAMIDES AND DIALKYL-SUBSTITUTED SULFOXIDES AND MIXTURES THEREOF, WHEREIN THE ALKYL GROUPS CONTAIN FROM 1 TO 3 CARBON ATOMS AND THE ACYL GROUPS OF THE CARBOXAMIDES CONTAIN FROM 1 TO 3 CARBON ATOMS, AND (2) INJECTING THE ADMIXTURE SO MADE DOWN THE WELL AND BACK INTO THE FORMATION IN CONTACT WITH SAID CALCAREOUS ROCK.

Claim 2

A METHOD OF ACIDIZING A PETROLIFEROUS FORMATION CONTAINING CALCAREOUS ROCK TRAVERSED BY A WELL WHICH CONSISTS ESSENTIALLY OF THE STEPS OF (1) ADMIXING WITH A LIQUID SELECTED FROM THE GROUP CONSISTING OF BRINE, WATER, AND EMULSIONS OF OIL AND WATER AND OF OIL AND BRINE, AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC, FORMIC, ACETIC, SULFAMIC, AND ANHYDRIDES AND MIXTURES THEREOF IN AN AMOUNT BETWEEN ABOUT 1% BY WEIGHT AND THAT NECESSARY TO MAKE A SATURATED SOLUTION THEREOF, AND A RETARDANT TO ACID ATTACK ON CALCAREOUS ROCK SELECTED FROM THE GROUP CONSISTING OF DIALKYL-SUBTITUTED CARBOXAMIDES AND DIALKYL-SUBSTITUTED SULFOXIDES AND MIXTURES THEREOF, WHEREIN THE ALKYL GROUPS CONTAIN FROM 1 TO 3 CARBON ATOMS AND THE ACYL GROUPS OF THE CARBOXAMIDES CONTAIN FROM 1 TO 3 CARBON ATOMS, AND (2) INJECTING THE ADMIXTURE SO MADE DOWN THE WELL AND BACK INTO THE FORMATION IN CONTACT WITH SAID CALCAREOUS ROCK.