TREATMENT OF SHALE FORMATIONS USING A CHELATING AGENT

摘要

The present invention relates to a process for treating a shale formation comprising introducing a fluid containing glutamic acid N,N-diacetic acid or a salt thereof (GLDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA),and/or N- hydroxyethyl ethylenediamine N,N′,N′-triacetic acid or a salt thereof (HEDTA) into the formation which process may optionally contain an additional fracturing step.