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A process for formulating and applying a silicate/silica cement composition to the treatment of a wellbore comprising the steps of mixing an appropriate silica compound with an aqueous water-soluble silicate solution and injecting the mixture into the wellbore in such a manner as to penetrate void s

A process for formulating and applying a silicate/silica cement composition to the treatment of a wellbore comprising the steps of mixing an appropriate silica compound with an aqueous water-soluble silicate solution and injecting the mixture into the wellbore in such a manner as to penetrate void spaces in or adjoining the wellbore. The mixture is cured in place, hardening into a solid impermeable cement which plugs the penetrated void spaces.

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A process for plugging void spaces in or adjoining a well bore with a silicate/silica cement comprising the steps of: (a) admixing a substantially water-insoluble silica compound, which is at least somewhat more amorphous than quartz, in an aqueous solution containing a water-soluble silicate to pro

A process for plugging void spaces in or adjoining a well bore with a silicate/silica cement comprising the steps of: (a) admixing a substantially water-insoluble silica compound, which is at least somewhat more amorphous than quartz, in an aqueous solution containing a water-soluble silicate to produce a mixture comprised of about 0.1 to about 60 percent by weight of said silica compound, after 20 to about 99 percent by weight of said aqueous solution containing said water-soluble silicate and about 0 to about 80 percent by weight of an inert solid; (b) injecting said mixture into said well bore so that said mixture penetrates said void spaces; (c) curing said mixture at the formation temperature to form said silicate/silica cement in said void spaces wherein the set up time and strength of said cement are a function of the formation temperature, the concentration of said silica compound and water-soluble silicate in said reaction mixture, and the properties of said silica compound and water-soluble silicate; and (d) plugging said void spaces with said silicate/silica cement.