Acidizing wells

Claim 1

A METHOD FOR ACIDIZING SILICEOUS GEOLOGICAL FORMATION TRAVERSD BY A BORE HOLE WITH A FLUOPHOSPHORIC ACID CONTAINING ACIDIZING REAGENT TO REDUCE THE RESISTANCE OF SAID FORMATION TO THE FLOW OF FLUIDS THERETHROUGH WHICH COMPRISES POSITIONING A TUBING WITHIN SAID WELL BORE INTRODUCING A FLUOPHOSPHORIC ACID CONTAININGACIDIZING REAGENT CAPABLE OF REACTING WITH THE CONSTITUENTS OF THE FORMATION TO PRODUCE A SEPNT ACIDIZING REAGENT, FORCING THE ACIDIZAING REAGENT DOWN THE TUBING AND INTO THE FORMATION UNTIL AN AMOUNT OF ACID SUFFICIENT TO INCREASE THE PERMEABILITY OF THE FORMATION HAS ENTERED THE TUBING, DISPLACING THE ACID FROM THE TUBING BY ADMITTING A DISPLACING FLUID INTO SAID TUBING WHEREBY THE ACIDIZING REAGENT CONTAINED IN SAID TUBING IS EMPTIED INTO THE FORMATION AND THEREAFTER INTRODUCING INTO THE TUBING A PETROLEUM OIL OVER-DISPLACING FLUID, THE AMOUNT OF OVER-DISPLACING FLUID EMPLOYED BEING A VOLUME NOT LESS THAN THE VOLUME OF ACIDIZING AGENT EMPLOYED AND SUFFICIENT TO EFFECT THE IRREDUCIBLE SATURATION OF SAID FORMATION WITH THE SPENT ACIDIZING REAGENT PRODUCED BY THE INTERACTION OF SAID ACIDIZING REAGENT AND SAID FORMATION WHEREBY THE PRECIPITATE FORMING TENDENCIES OF SAID SPENT ACIDIZING REAGENT IN MITIGATED.