A method and apparatus for ramping of stimulation chemical concentrations for treatement of subterranean formations

摘要

An acid concentration is injected into a formation in a manner which slowly changes the salinity and pH of the rock matrix of the formation to significantly reduce the effects on clay particles or fines in the formation. The acid concentration comprises a plurality of fluids which are injected into the formation in a ramped or stepped sequence. More specifically, one or more of the fluids are ramped or changed while the total flow rate is maintained by varying the flow rate of a dilution fluid or fluids. The volumes of the fluids forming the acid concentration and the rate or rates at which the volume percents are ramped will vary depending on the matrix of the formation being treated.