Importance

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Abstract

A process for killing and suspending mixtures of hydrocarbonaceous fluid production, particularly oil, in a formation containing same which minimizes formation damage. First, a 'Spacer volume' of liquid containing a chemical blowing agent is directed into the formation's productive interval. Said blowing agent decomposes in the formation and generates gas sufficient to force hydrocarbonaceous fluids away from a wellbore in said formation. Afterwards, a solidifiable pumpable gel mixture is placed via a wellbore into the formation's productive interval and also within said wellbore. Said mixture solidifies in the formation and forms a gel plug within the wellbore. Thereafter, a light weight cement is placed over said gel plug effectively 'killing' and suspending the production of hydrocarbonaceous fluids. The gel mixture comprises (1) water; (2) a cross linkable polymer having at least one functional group selected from a member of the group consisting of an amide, an amine, a hydroxyl, or a thiol group; and (3) a partially methylated aminoplast resin which cross links with said polymer.

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First Claim