Method of preventative water well maintenance

In a method of preventative well maintenance using CO2 in a well comprising permanent equipment for well maintenance and water pumping equipment, the water pumping equipment remaining in the well during the maintenance, the improvement comprising

• using the permanent equipment for well maintenance remaining in the well to inject liquid and vapor CO2 into the well,
• controlling CO2 phase changes during CO2 injection cycles by manipulating injection cycles of liquid and vapor CO2 and providing a distribution of energy throughout an entire well structure including all parts of a producing interval of the well and surrounding formation,
• causing a surging effect in the well by the distribution of energy, and
• maintaining and distributing the surging effect throughout the entire well structure, and the surging effect being distributed by at least one energy resulting from controlling CO2 phase changes during injection of the liquid and vapor CO2,
• wherein the at least one energy includes chemical energy, thermal energy, and mechanical energy.