Increasing the clay-dissolving capability of a relatively high pH self-generating mud acid

摘要

The clay-dissolving capability of a self-generating mud acid comprising an aqueous solution or dispersion of a fluoride salt, an ester of a 1-5 carbon atom aliphatic alcohol and a 2-5 carbon atom fatty acid suitable for use at temperatures exceeding about 180 DEG F is improved by adding an effective amount of an aminopolyacetic acid salt chelating or complexing agent.