Method of controlling permeability damage of hydrocarbon formations during steam injection while preventing pipe corrosion

摘要

The present invention provides a method for inhibiting permeablility damage of a hydrocarbon formation containing clay minerals in the vicinity of a well penetrating the formation while inhibiting pipe corrosion. It comprises: (1) injecting a wet steam comprising (a) an amount of ammonium ions to produce an ammonium ion concentration in the vapor phase condensate of the wet steam effective to inhibit the permeability damage of the formation in the vicinity of the vapor phase, and (b) an amount of a bicarbonate salt of the alkali metals, or mixtures thereof, effective to raise the pH of the liquid phase of the wet steam within the range of from about 7.5 to about 10.5; and (2) monitoring the pH of the residual liquid phase and continually adjusting the addition of the bicarbonate salt to maintain the pH within the range of from about 7.5 to about 10.5.