04137970 is referenced by 101 patents and cites 6 patents.

A tool, e.g., a well packer, for restricting the flow of fluid through an annulus defined by the interior walls of a fluid conduit, e.g., well casing, and the exterior of a tubular member, e.g., the packer mandrel, is disclosed. The novelty of the present invention lies in the deformable packer element of such a tool, wherein in lieu of rubber, a chemically activated material which expands upon contact with fluid in the conduit is employed to effect the desired seal. A method of using such a tool is also disclosed.

Title
Packer with chemically activated sealing member and method of use thereof
Application Number
5/789055
Publication Number
4137970
Application Date
April 20, 1977
Publication Date
February 6, 1979
Inventor
Clarence J Durborow
Englewood
CO, US
George P Laflin
Denver
CO, US
Agent
G H Korfhage
Assignee
The Dow Chemical Company
MI, US
IPC
E21F 16/00
E21B 33/12
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