Abstract: A system of patching single and multiple casing leaks that occur in an injection well annulus, where there is direct communication from an outermost casing string to an original open-hole wellbore and adjacent earth strata. Preferred in this pumping system is a four-stage pump process employing four separate types of fluids. The first Injection Stage utilizes either H.sub.2 SiO.sub.3, Na.sub.2 in a solution of water forming Na.sub.2 SiO.sub.3 +H.sub.2 O (Sodium Metasilicate) or Na.sub.2 O*SiO.sub.2 (Sodium Silicate) in water. The second Injection Stage utilizes CaCl.sub.2 solution in water. These two solutions react in a double replacement chemical reaction to yield an aqueous phase and a solid phase. The third Injection Stage is then implemented, the same including a bentonite/high-density, high-solids, concentrated slurry additionally containing large plugging materials suspended therein. The Fourth Stage utilizes covalently bonded N.sub.2 in a gaseous state. After injection of the first Three Stages, N.

Abstract: A system designed to patch single and multiple casing leaks that occur in an injection well annulus where there is direct communication from the outermost casing string to the original open-hole wellbore and the adjacent earth strata. This system utilizes a four-stage process which consists of four separate types of fluids. The first injection stage is a CaCl.sub.2 solution in water. The second injection stage utilizes H.sub.2 SiO.sub.3, Na.sub.2 in a solution of water to create sodium metasilicate Na.sub.2 SiO.sub.3 in water. These two react in a double replacement chemical reaction to yield an aqueous phase and a solid phase. The third injection stage is then implemented, the same including a bentonite/attapulgite/diatomaceous earth slurry with large plugging materials suspended therein. The fourth stage utilizes covalently bonded N.sub.2 in a gaseous state. After injection of the first three stages N.sub.