Method for rigless zone abandonment using internally catalyzed r

Details Method for rigless zone abandonment using internally catalyzed r Method for rigless zone abandonment using internally catalyzed r

1978-07-07

1980-02-19

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166281, E21B 33138

Patent

active

041890027

ABSTRACT:
A zone of a subterranean formation penetrated by a well bore is permanently plugged by injecting a liquid resin system containing at least one thermosetting resin and at least one curing agent or catalyst therefor into the formation and injecting into the wellbore following the resin system, a second liquid containing at least one chain stopping compound to react with one component in the resin system to prevent any of the resin system remaining in the well bore from crosslinking to a sufficient crosslink density to form a solid in the wellbore. Preferably, the second liquid also contains a fluid loss additive to minimize loss of the second liquid from the wellbore to the formation. The method permits a zone to be plugged off and abandoned without the need to erect a drilling rig to drill out excess plugging material remaining in the wellbore. In a preferred embodiment, the resin system comprises the diglycidyl ether of bisphenol A and polymethylene phenylamine in ethylene glycol ethyl ether, and the preferred second liquid is monoethanolamine in ethylene glycol ethyl ether as a solvent with ethylcellulose and silic flour to control fluid loss.

REFERENCES:
patent: 2674322 (1954-04-01), Cardwell
patent: 3134436 (1964-05-01), Means et al.
patent: 3237691 (1966-03-01), Koch et al.
patent: 3373814 (1968-03-01), Eilers et al.
patent: 3416604 (1968-12-01), Rensvold
patent: 4018286 (1977-04-01), Gall et al.

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