Abstract: A method of treating wells with the use of a foam as a circulating fluid provides for the steps of generating a stable foam, circulating the foam up the well to remove loose solids and fluids from the well, injecting solvents to dissolve liquid and solid hydrocarbons, circulating a mixture of foam and mineral acid to remove ferrous salts and calcium carbonate from the well, circulating a calcium sulfate converter to remove calcium sulfate, cleaning up any residue by circulating the foam up the well. The method also provides for the use of iron chelator and corrosion inhibitor. The method has applications in stimulation of the well production, when such production becomes adversely affected by a build-up of solids, during stimulation of water injection, stimulation of a source well, treatment of a disposal well, as well as treatment of a gas producing well.