Mixed metal layered hydroxide hydrophilic organic material as thickeners for water and other hydrophylic fluids
AssigneeThe Dow Chemical Company
InventorsJohn L. Burba, III, Audrey L. Barnes
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Abstract
Novel compositions useful as fluid gelling agents, especially for use in subterranean applications such as drilling fluids, are prepared by reacting an aqueous dispersion of a clay, such as bentonite, with an aqueous gel of a monodispersed mixed metal layered hydroxide of the formula Li.sub.m D.sub.d T(OH).sub.(m+2d+3+na) A.sub.a.sup.n, where D is a divalent metal, such as Mg, T is a trivalent metal, such as Al, and A represents other monovalent or polyvalent anions, the formula being described in detail in the disclosure.
Claims31
A mixture comprising a hydrophilic organic material and at least one substantially crystalline;
- monolayer mixed metal hydroxide of the formula:
- Li.sub.m D.sub.d T(OH).sub.(m=2d+3+na) (A.sup.-n).sub.a.xH.sub.2 O, where
- m is an amount of Li in the range of zero to about 1;
- D is a divalent metal ion, and d is an amount of D in the range of zero to about 4;
- T is a trivalent metal ion;
- A represents monovalent or polyvalent anions of valence -n, with a being the amount of A anions;
- (m+d) is greater than zero and (m+2d+3+na) is equal to or greater than 3;
- and
- x is zero or more representing excess waters of hydration,
- said hydrophilic organic material being a quantity which causes the crystalline monolayered mixed metal hydroxide to be dispersible in aqueous media, the monolayers exhibiting thicknesses in the range of about 8 to about 16 angstroms.
A mixture comprising a hydrophilic organic material and at least one crystalline mixed metal layered hydroxide of the formula:
- Li.sub.m D.sub.d T(OH).sub.(m+2d+3+na) (A.sup.-n).sub.a. xH.sub.2 O, where
- m is an amount of Li in the range of zero to about 1;
- D is at least one divalent metal ion of the group consisting of Mg, Ca, Ba, and Sr, and d is an amount of D in the range of zero to about 4;
- T is a trivalent metal ion;
- A represents monovalent or polyvalent anions of valence -n, with a being the amount of A anions;
- (m+d) is greater than zero and (m+2d+3+na) is equal to or greater than 3;
- and
- x is zero or more representing excess waters of hydration and is small enough that the mixture is dry enough to be a flowable powder,
- said hydrophilic organic material being a quantity which causes the crystalline mixed metal hydroxide to be dispersible in aqueous media.
Dependencies are inferred from the claim text.