COMPOSITIONS AND METHODS FOR IMPROVING THERMAL AND BRINE STABILITY OF NANOPARTICLES
Amine functionalized nanoparticles comprising a core-shell nanoparticle morphology comprising a trialkoxyorganosilane coated nanoparticle core and an amine functionalized group on the surface of the nanoparticle as a shell are disclosed, wherein the nanoparticle has an average particle size from about 1 nm to about 1000 nm. Methods and applications of use of the amine functionalized nanoparticles and compositions comprising the amine functionalized nanoparticles dispersed in an aqueous medium are also disclosed.
1 - 20 . (canceled)
21 . An amine functionalized nanoparticle comprising:
a reaction product obtained by a first step of coating a nanoparticle with a trialkoxyorganosilane and thereafter covalently bonding an amine-functionalized silane to the surface of the coated nanoparticle,
wherein the reaction product has a core-shell nanoparticle morphology comprising the trialkoxyorganosilane coated nanoparticle core and the amine functionalized group on the surface of the coated nanoparticle core as a shell, and
wherein the nanoparticle has an average particle size from about 1 nm to about 1000 nm.
22 . The nanoparticle of claim 21 , wherein the nanoparticle has an average particle size from about 1 nm to about 500 nm, or from about 1 nm to about 200 nm.
23 . The nanoparticle of claim 21 , wherein the nanoparticles are selected from silica and metal-based nanoparticles.
24 . The nanoparticle of claim 23 , wherein the silica is selected from the group consisting of colloidal silica, nanosilica, silicate nanoparticle, polyhedral oligomeric silsesquioxane nanoparticle, and silicon dioxide nanoparticle dispersion.
25 . The nanoparticle of claim 21 , wherein the nanoparticles are free of ceramics and carbon or carbon-based materials.
26 . The nanoparticle of claim 21 , wherein the trialkoxyorganosilane is an epoxy functional silane, hydroxylic hydrophilic silane, hydroxyl functional silane, or thiol functional silane.
27 . The nanoparticle of claim 21 , wherein the amine functionalized group is provided by an amine-functionalized silane according to formula I or II,
wherein:
R 1 , R 2 , and R 3 are independently —OMCH 3 , —OH, —CH 3 , or —Cl and wherein M is absent, —(CH 2 ) m —, or —(CH 2 Y) n —, wherein m is an integer from 1 to 5, n is an integer from 1 to 5, wherein Y is O, N, or S; and R 4 is —CH 2 , or a substituted or an unsubstituted, linear or branched C2-C20 alkyl group, or —(Ar)—; R 5 is absent or H; and R 6 is —CH 3 , a substituted or an unsubstituted, linear or branched C2-C20 alkyl group or a primary, secondary, tertiary or quaternary alkyl amine, —(Ar)—, ═(CNH 2 NH 2 ), —((CH 2 ) o NH 2 ), —((CH 2 ) o NHCH 3 ), —((CH 2 ) o NH(CH 2 ) p NH 2 ), —((CH 2 ) o NH(CH 2 ) p Ar), wherein o and p are independently integers from 1 to 15.
28 . The nanoparticle of claim 27 , wherein the amine-functionalized silane is 3-aminopropyl)trimethoxysilane.
29 . The nanoparticle of claim 21 , wherein the amine functionalized group is covalently bonded to the trialkoxyorganosilane coated nanoparticle.
30 . The nanoparticle of claim 21 , wherein the molar ratio of the trialkoxyorganosilane to the amine-functionalized silane is about 1:1 to about 100:1 or about 1:1 to about 20:1, and the mass ratio of the trialkoxyorganosilane coated nanoparticle core to the amine-functionalized silane on the surface of the coated nanoparticle is about 1:1 to about 100:1 or about 1:1 to about 40:1.
31 . An amine functionalized nanoparticle composition comprising the nanoparticle of claim 21 dispersed in an aqueous medium.
32 . A composition for improving hydrocarbon recovery from a subterranean formation, the composition comprising: an amine functionalized nanoparticle according to claim 21 , a surfactant, a coupler and/or a solvent.
33 . The composition of claim 32 , wherein the surfactant comprises an amphoteric surfactant, nonionic surfactant, anionic surfactant or a mixtures thereof, and wherein the solvent comprises a water source, mutual solvent, or mixture thereof.
34 . The composition of claim 32 , wherein the surfactant comprises a nonionic surfactant comprising alkoxylated alcohols, alkoxylated alkyl phenols, or ethylene oxide/propylene oxide copolymers having an HLB of at least about 10.
35 . The composition of claim 33 , wherein the anionic surfactant comprises salts of sulfate, sulfonate, and/or carboxylate.
36 . The composition of claim 32 , further comprising a stability component comprises a sulfate, chloride, carbonate or oxide salt of aluminum, titanium or zirconium.
37 . The composition of claim 32 , wherein amine functionalized nanoparticle to surfactant has a ratio of 100:1 to 1:100.
38 . An injectate composition comprising a water source and the composition of claim 32 .
39 . Use of the composition of claim 32 to increase the rate of hydrocarbon recovery, total yield of hydrocarbon recovered or both from a subterranean formation.