Shale hydration inhibition agent and method of use

Details Shale hydration inhibition agent and method of use Shale hydration inhibition agent and method of use

2005-05-06

2009-02-24

Gulakowski, Randy (Department: 1796)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S129000, C507S248000

Reexamination Certificate

active

07494958

ABSTRACT:
A water-base wellbore fluid for use in subterranean wells that penetrate through a subterranean formation containing a shale which swells in the presence of water. The well bore fluid includes, an aqueous based continuous phase, and a shale hydration inhibition agent. One illustrative shale hydration inhibition agent is preferably the reaction product of a hydrogenation reaction of the product of the reaction of an aromatic amine with an aldehyde, preferably formaldehyde. Alternatively the shale hydration inhibition agent may be the reaction product of a hydrogenation reaction of the product of the reaction of aniline and formaldehyde. In one illustrative embodiment, the shale hydration inhibition agent is selected from the class of compounds known as polycycloaliphatic amines. The shale hydration inhibition agent is present in sufficient concentration to substantially reduce the swelling of shale drilling cuttings upon contact with the fluid.

REFERENCES:
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International Search Report issued on Sep. 18, 2006 for PCT/US2005/035619, filed on Oct. 4, 2005.

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