Patent ID: 7131495

Claim:
A method for preparing chlorine dioxide block-removing agent in wells, comprising: a. providing a tank ( 1 ), adding one or more selected from the group consisting of chlorate and chlorite, and water into the tank ( 1 ) to make them dissolve thoroughly in the tank ( 1 ); b. providing a tank ( 2 ), adding an acidic substances, which can be dissolved in water and produce hydrogen ion in an aqueous solution, and water into the tank ( 2 ) to make them dissolve thoroughly in the tank ( 2 ); c. providing a high pressure injection pump ( 3 ) which is provided with a water-feeding pipe ( 4 ) and a water-outgoing pipe ( 5 ), the said water-feeding water pipe ( 4 ) being directly connected with the tank ( 1 ), and connected with the tank ( 2 ) through a pressure pump ( 7 ) provided on the tank ( 2 ); d. initiating the high pressure injection pump ( 3 ) and the pressure pump ( 7 ), making the solution in the tank ( 1 ) and the solution in the tank ( 2 ) enter into the high pressure injection pump ( 3 ) via the water-feeding pipe ( 4 ) and being pressured in the pump ( 3 ), wherein the mixed solution enters the well ( 6 ) via the water-outgoing pipe ( 5 ) of high pressure injection pump ( 3 ), and wherein the chlorine dioxide block-removing agent is synthesized in the well by the reaction between the one ore more selected from the group consisting of chlorate and chlorite and the acidic substance.