Surfactants not toxic to bacteria

Details Surfactants not toxic to bacteria Surfactants not toxic to bacteria

2006-12-11

2010-06-22

Seidleck, James (Department: 1796)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S202000, C507S240000, C507S241000, C507S256000, C507S260000, C507S267000, C507S269000

Reexamination Certificate

active

07741252

ABSTRACT:
An oilfield treatment method is given that uses fluids that contain surfactants used as foamers and/or viscosifiers such that the fluids pass the Alberta Energy and Utilities Board Directive 27 requirements for low toxicity to certain bioluminescent bacteria. Such fluids may be used in oilfield treatments, for example drilling and stimulation, near fresh water aquifers. The surfactants are certain non-ionic surfactants that are not aromatic, or certain amphoteric surfactants (that can be neutral), or certain zwitterionic surfactants, (in which both positive and negative charges are present in a single molecule so that the whole molecule is neutral).

REFERENCES:
patent: 6258859 (2001-07-01), Dahayanake
patent: 6703352 (2004-03-01), Dahayanake
patent: 2002/0076803 (2002-06-01), Crews
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patent: 2006/0148660 (2006-07-01), Chen
patent: WO 9856497 (1998-12-01), None

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