Process for the consolidation of sand
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Sep 12, 1997
filing date -
Sep 13, 1996
priority date (Note) -
Expired
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Abstract
Process for the consolidation of sand in a well which produces fluids, particularly oil and/or gas, comprising the following steps: 1) optional preflush with an aqueous solution of inorganic salts, preferably KCl; 2) injection into the formation of a consolidating agent essentially consisting of an aqueous solution of sodium silicate in water; 3) flushing with an inert gas, preferably nitrogen, of the formation treated in step (2) until the excess consolidating agent and water injected in step (2) have been removed; 4) subsequent introduction into the formation thus treated of an aqueous solution of an acid having a pKa at 25.degree. C. of between 3 and 10, preferably selected from ammonium chloride and acetic acid.
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