Grouting application of the annulas seal system for well casings

Details Grouting application of the annulas seal system for well casings Grouting application of the annulas seal system for well casings

1997-12-18

1999-10-12

Tsay, Frank

Wells

Processes

Cementing, plugging or consolidating

166294, E21B 3314

Patent

active

059642920

ABSTRACT:
A grouting system for well casings (26) uses a grout wrap (10) including first (12) and second (14) flexible sheets with a layer (16) of flexible, hydrophilic grout material therebetween that expands upon absorption of water. In the preferred embodiment, each well casing section (30a,b) is enclosed by the preferred grout wrap (10) before placement in the well hole (28). After placement, the grout material is exposed to water for absorption so that the grout material expands and seals the casing.

REFERENCES:
patent: 4936386 (1990-06-01), Colangelo
patent: 5271469 (1993-12-01), Brooks et al.
patent: 5309994 (1994-05-01), Douglas et al.
patent: 5389146 (1995-02-01), Liao
patent: 5476142 (1995-12-01), Kajita

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