PRECIPITATION OF INORGANIC SALTS IN POROUS MEDIA

摘要

Present invention concerns a method for precipitation of inorganic salts in porous media, with controlled consolidation and permeability loss. Inorganic salts are precipitated within the pore structure and inter granular spaces of granular sand stones such as unconsolidated hydrocarbon reservoir strata or similar, or within the pore structure of water permeable natural rocks. A first solution of a first soluble salt and a second solution of a second soluble salt are mixed at the desired place for precipitation, and the method comprises use of a spacer solution in order to control the pH and reaction rate. The first solution and the second solution are injected alternating with the spacer solution between and preferably last, and a pumping device is connected to the desired place, which device creates a reciprocating flow pulsation in that the device works both in forward and backward direction.