Treating water -sensitive clay-contg formations - with aluminium - salt solns prior to waterflooding or steam injection

摘要

Water-sensitive clayey formations are treated prior to water flooding or steam injection to increase their water-permeability by injecting into the formation an aluminium salt, pref. aluminium chloride, in a concn. of 0.2-3 (pref. 0.4-1) wt % in an aqueous soln.