Chemical process for backsurging fluid through well casing perfo

Wells – Processes – Chemical inter-reaction of two or more introduced materials

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166312, E21B 2100

Patent

active

042190835

ABSTRACT:
A backsurge of fluid through perforations in a well casing is chemically induced by injecting into the surrounding reservoir a solution which contains (a) nitrogen gas-generating reactants, (b) a reaction-retarding alkaline buffer, and (c) a pH-reducing reactant that is capable of subsequently overriding the buffer, so that a rapid production of gas and heat causes a backsurging of fluid into the wellbore.

REFERENCES:
patent: 2124495 (1938-07-01), Miller
patent: 3141513 (1964-07-01), Davis
patent: 3171480 (1965-03-01), Carter
patent: 3303880 (1967-02-01), Scott
patent: 3532165 (1970-10-01), Raifsnider
patent: 3889753 (1975-06-01), Richardson
patent: 3892275 (1975-07-01), Lybarger et al.

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