Wells – Processes – Chemical inter-reaction of two or more introduced materials
Patent
1994-04-12
1995-05-09
Suchfield, George A.
Wells
Processes
Chemical inter-reaction of two or more introduced materials
166308, 507903, 507921, 507922, E21B 4326
Patent
active
054131782
ABSTRACT:
The present invention relates to a method of controllably breaking an aqueous based viscosified fluid containing a gel stabilizer such as sodium thiosulfate, when the fluid is within a subterranean formation having a temperature above about 175.degree. F. The method is accomplished by the incorporation of a particular selected breaker comprising an alkali metal chlorite or hypochlorite in the viscosified fluid containing the gel stabilizer. The method is particularly effective in providing a controlled break in a treatment fluid introduced into a subterranean formation having a static temperature in the range of from about 200.degree. F. to about 300.degree. F.
REFERENCES:
patent: 3146200 (1964-08-01), Goldstein et al.
patent: 5067565 (1991-11-01), Holtmyer et al.
patent: 5110486 (1992-05-01), Manalastas et al.
patent: 5145012 (1992-09-01), Hutchins et al.
Shuchart Chris E.
Walker Michael L.
Halliburton Company
Kent Robert A.
Suchfield George A.
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