Method for selectively plugging a subterranean location in a well with liquid organic resin-forming material

Claim 1

IN A METHOD FOR SELECTIVELY DECREASING THE PERMEABILITY OF A PERMEABLE PROTION OF A WELL AREA BY PLUGGING THE PERMEABLE PORTION WITH A LIQUID OGANIC RESIN-FORMING MATERIAL, THE STEPS COMPRISING CONDUCTING AN INJECTIVITY PROFILE IN THE WELL BY VERTIVALLY TRAVERSING THE WELL AREA WITH A PRIMARY INTERFACE FORMED BETWEEN TWO DISSIMILAR AQUEOUS LIQUIDS, EACH OF WHICH CAN BE DISTINGUISHED BY DETECTION MEANS, TO LOCATE THE PERMEABLE PROTION TO BE PLUGGED, SAID PEMEABLE PORTION BEING SPACED UPWARDLY FROM THE BOTTOM OF THE WELL, FORMING A SECONDARY INTERFACE BETWEEN A SALT WATER LAYER IN THE LOWER PORTION OF THE WELL AND AN OVERLYING FRESH WATER LAYER, ADJUSTING THE AMOUNTS OF THE RESPECTIVE LIQUIDS IN THE LAYERS TO POSITION SAID SECONDARY INTERFACE WITHIN SAID LOCATED PERMEABLE PORTION OF THE WELL, CHARGING INTO SAID SECONDARY INTERFACE AN AQUEOUS, LIQUID, ORGANIC RESIN-FORMING MATERIAL HAVING A SEPCIFIC GRAVITY FROM ABOUT 1.07 TO 1.18 AND A VISCOSITY OF ABOUT 1 TO 5 CENTIPOISES, SAID SECONDARY INTERFACE BEING LOCATED WITHIN SAID PERMEABLE PORTION AT A POSITION DETERMINED FROM THE INJECTIVITY PROFILE SUCH THAT THE UPPER AND LOWER LEVELS OF THE MATERIAL ARRIVE AT APPROXIMATELY THE SAME TIME AT THE UPPER AND LOWER LEVELS OF THE PERMEABLE POTION OF THE WELL TO BE PLUGGED, DISPLACING THE RESIN-FORMING MATERIAL INTO THE ADJACENT PERMEABLE AREA, AND ALLOWING THE RESIN-FORMING MATERIAL TO SET AND PLUG SAID PERMEABLE PORTION OF THE WELL.