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US 5,964,292 AGranted
Grouting application of the annulas seal system for well casings
OwnerRex L. Hewittinventor
Life of this patent
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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.
Claims22
A well casing grout wrap comprising:
- a flexible first sheet;
- a flexible second sheet;
- and
- a flexible grout layer between said sheets composed of hydrophilic grout material that expands upon absorption of water,
- said sheets and grout layer being sized for wrapping at least a portion of the exterior of a well casing.
2 more elements
In combination:
- a well casing having a periphery presenting a circumference;
- and
- a well casing grout wrap wrapping at least a portion of said periphery, said grout wrap including
- a flexible first sheet,
- a flexible second sheet, and
- a flexible grout layer between said sheets composed of hydrophilic grout material that expands upon absorption of water.
3 more elements
A well casing grouting method comprising the steps of:
- (a) placing a plurality of series-connected, well casing sections into a well hole;
- (b) prior to placing each of said sections into the hole, enclosing the periphery of each of said sections with at least one grout wrap including
- a flexible first sheet,
- a flexible second sheet, and
- a flexible grout layer between said sheets composed of hydrophilic grout material that expands upon absorption of water,
- said sheets and grout layer being sized for wrapping at least a portion of said periphery;
- and
- (c) after placing said sections and grout wrap into the well hole, exposing said grout material to water for absorption thereof so that said grout material expands in order to seal said sections with said grout material.
5 more elements
Dependencies are inferred from the claim text.