Method and composition for cleaning a well bore prior to...

Wells – Processes – Cleaning or unloading well

Reexamination Certificate

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Details

C166S304000, C166S305100, C507S260000, C507S261000

Reexamination Certificate

active

07318477

ABSTRACT:
The invention generally relates to a spacer system for cleaning a section of a subterranean well borehole and casing prior to cementing. The spacer system of the invention comprises a at least one alkyl ether citrate and, optionally, at least one alcohol ethoxylate.

REFERENCES:
patent: 2875831 (1959-03-01), Martin et al.
patent: 3878895 (1975-04-01), Wieland et al.
patent: 4588032 (1986-05-01), Weigand et al.
patent: 5273953 (1993-12-01), Szekely et al.
patent: 5866517 (1999-02-01), Carpenter et al.
patent: 6235914 (2001-05-01), Steiger et al.
patent: 2003/0006040 (2003-01-01), McGregor et al.
patent: 0 199 131 (1986-10-01), None
patent: 0243067 (1987-10-01), None
International Search Report for International Application No. PCT/EP2006/062028 dated Dec. 6, 2006.
IPER for International Application No. PCT/EP2006/062028 dated Jul. 25, 2007.

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