Method and composition for stabilizing earth and sand to...

Details Method and composition for stabilizing earth and sand to... Method and composition for stabilizing earth and sand to...

2006-11-08

2010-11-30

Kreck, John (Department: 3672)

Hydraulic and earth engineering

Earth treatment or control

Chemical

Reexamination Certificate

active

07841804

ABSTRACT:
Method for stabilizing sand and earth by precipitation of struvite, comprising applying an aqueous solution of salts comprising: a) Mg2+ions of a concentration 10-200 mM, b) NH4+ions either added in the form of ammonium salt or from decomposition of added urea, of concentration 10-200 mM, c) anions added as part of corresponding cations, d) polyphosphate (Na5P3O10/Na3P3O9) of concentration 10-100 mM, e) a catalyst chosen among acidic and alkaline phosphatase.

REFERENCES:
patent: 4334905 (1982-06-01), Wagner et al.
patent: 6401819 (2002-06-01), Harris et al.
patent: 2001/0046419 (2001-11-01), Taki et al.
patent: 2-173185 (1990-02-01), None
patent: 19920148842 (1993-12-01), None
patent: WO 0153202 (2001-07-01), None
R.E. Harris et al, “New Applications for Enzymes in Oil and Gas Production”, European Petroleum Conference, 1998, vol. 1, SPE, 50621, pp. 467-475.

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