Process for treating an underground formation
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United States of America Patent
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Feb 28, 2012
Grant Date -
May 8, 2008
app pub date -
Oct 6, 2005
filing date -
Oct 6, 2004
priority date (Note) -
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Abstract
An underground formation is consolidated by (a) incorporating into a treatment fluid (i) at least one chemical substance which is capable of undergoing a chemical change that alters the physico-chemical environment of the treatment fluid and which is a bicarbonate or a compound that generates a phosphate, phosphoric acid, sulphate, sulphuric acid, hydrogen sulphide, S2−, carbon dioxide, bicarbonate, base or acid; and, optionally, (ii) at least one additional chemical substance selected from salts and complexes of metals having a valency of 2 or higher; introducing the treatment fluid into the formation; and allowing the chemical substance (i), alone or in combination with the optional chemical substance (ii), to undergo a chemical change that alters the physico-chemical environment of the treatment fluid such that a consolidating mineral is deposited in the underground formation.
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