# US 10,870,794 B2 · Using brine resistant silicon dioxide nanoparticle dispersions to improve oil recovery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,794 B2 - Document ID: US10870794B2 - Status: Granted - Kind: B2 - Application number: 16/179,676 - Filed: 2018-11-02 - Published: 2019-05-09 - Granted: 2020-12-22 - Earliest claimed: 2017-11-03 - Assignees: Nissan Chemical America Corporation - Applicants: Nissan Chemical America Corporation - Inventors: David L. Holcomb; Yusra Khan Ahmad; John Edmond Southwell - Web page: https://patentgrep.com/patent/US10870794B2 ## CPC - C09K 8/845: {containing inorganic compounds} - C09K 8/032: {Inorganic additives} - C09K 8/601: {using spacer compositions} - C09K 8/665: {containing inorganic compounds (proppants C09K8/80)} - C09K 8/72: Eroding chemicals, e.g. acids - C09K 8/80: Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open - E21B 43/26: by forming crevices or fractures - C09K 2208/10: Nanoparticle-containing well treatment fluids - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract The invention includes a method of extending an oil and gas system effective stimulated reservoir volume by performing the steps of adding a brine resistant silicon dioxide nanoparticle dispersion to oil well treatment fluids. This method is found to increase initial production rates of an oil well by over 20.0% as compared to wells either not treated with the brine resistant silicon dioxide nanoparticle dispersion technology or treated by conventional nano-emulsion surfactants. ## Claims ### Claim 1 A method of extending an oil and gas system effective stimulated reservoir volume comprising: a) selecting a brine resistant silicon dioxide nanoparticle dispersion that is characterized by having a change in turbidity of less than about 100 NTU after API brine exposure according to an API brine resistance test by use of a turbidimeter; and b) adding the brine resistant silicon dioxide nanoparticle dispersion into the oil and gas system as a pre-pad pill; wherein the added brine resistant silicon dioxide nanoparticle dispersion enhances flow of oil and gas through the oil and gas system beyond induced fracture network, thereby extending the oil and gas system effective stimulated reservoir volume; and wherein the brine resistant silicon dioxide nanoparticle dispersion comprises surface modified, neutral wet colloidal silica nanoparticles, which penetrate via accelerated diffusion into the reservoir beyond the induced fracture network, wherein the silica nanoparticles are surface modified with trimethoxy[3-(oxiranylmethoxy)propyl] silane, which is in an amount of 2.5% to 5% by weight of the brine resistant silicon dioxide nanoparticle dispersion. ### Claim 2 (depends on 1) The method of claim 1, further comprising adding a frac stage fluid into the oil and gas system after the pre-pad pill, wherein the volume of the brine resistant silicon dioxide nanoparticle dispersion pre-pad pill is from about 500 to about 1,000 U.S. gallons per about 3,000 to about 6,000 U.S. barrels of the frac stage fluid. ### Claim 3 (depends on 1) The method of claim 1, wherein the added brine resistant silicon dioxide nanoparticle dispersion diffuses into the natural and secondary fracture network of the oil and gas system, disjoins hydrocarbons from surfaces, and fragments the disjoined hydrocarbons into smaller oil droplets. ### Claim 4 (depends on 1) The method of claim 1, wherein the colloidal silica nanoparticles have an average diameter of between about 1 nm and about 100 nm. ### Claim 5 (depends on 1) The method of claim 1, wherein the colloidal silica nanoparticles have an average diameter of between about 12 nm and about 20 nm. ### Claim 6 A method of increasing initial production rates of an oil well a). selecting a brine resistant silicon dioxide nanoparticle dispersion that is characterized by having a change in turbidity of less than about 100 NTU after API brine exposure according to an API brine resistance test by use of a turbidimeter; and b). adding the brine resistant silicon dioxide nanoparticle dispersion into the oil well as a pre-pad pill; wherein the added brine resistant silicon dioxide nanoparticle dispersion enhances flow of oil and gas through the oil well beyond induced fracture network, thereby increasing the initial production rates of the oil well by over 20.0% as compared to wells either not treated with a silicon dioxide nanoparticle dispersion technology or treated by nano-emulsion surfactants; and wherein the brine resistant silicon dioxide nanoparticle dispersion comprises surface modified, neutral wet colloidal silica nanoparticles, which penetrate via accelerated diffusion into the reservoir beyond the induced fracture network, wherein the silica nanoparticles are surface modified with trimethoxy[3-(oxiranylmethoxy)propyl] silane, which is in an amount of 2.5% to 5% by weight of the brine resistant silicon dioxide nanoparticle dispersion. ### Claim 7 (depends on 6) The method of claim 6, further comprising adding a frac stage fluid into the oil well after the pre-pad pill, wherein the volume of the brine resistant silicon dioxide nanoparticle dispersion pre-pad pill is from about 500 to about 1,000 U.S. gallons per about 3,000 to about 6,000 U.S. barrels of the frac stage fluid. ### Claim 8 (depends on 6) The method of claim 6, wherein the added brine resistant silicon dioxide nanoparticle dispersion diffuses into the natural and secondary fracture network of the oil well, disjoins hydrocarbons from surfaces, and fragments the disjoined hydrocarbons into smaller oil droplets. ### Claim 9 (depends on 6) The method of claim 6, wherein the colloidal silica nanoparticles have an average diameter of between about 1 nm and about 100 nm. ### Claim 10 (depends on 6) The method of claim 6, wherein the colloidal silica nanoparticles have an average diameter of between about 12 nm and about 20 nm. ### Claim 11 A method of extending an oil and gas system effective stimulated reservoir volume, the method comprising the steps of adding oil well treatment fluids to the well in the order given to the well: a) adding an acid; b) adding a fresh water spacer; c) adding a brine resistant silicon dioxide nanoparticle dispersion pre-pad pill; d) adding a fresh water spacer; and e) inserting a pad of a frac treatment, wherein the added brine resistant silicon dioxide nanoparticle dispersion enhances flow of oil and gas through the oil and gas system beyond induced fracture network, thereby extending the oil and gas system effective stimulated reservoir volume; and wherein the brine resistant silicon dioxide nanoparticle dispersion comprises surface modified, neutral wet colloidal silica nanoparticles, which penetrate via accelerated diffusion into the reservoir beyond the induced fracture network, wherein the silica nanoparticles are surface modified with trimethoxy[3-(oxiranylmethoxy)propyl] silane, which is in an amount of 2.5% to 5% by weight of the brine resistant silicon dioxide nanoparticle dispersion; and wherein the brine resistant silicon dioxide nanoparticle dispersion is selected such that it has a change in turbidity of less than about 100 NTU after API brine exposure according to an API brine resistance test by use of a turbidimeter. ### Claim 12 (depends on 11) The method of claim 11, wherein the added brine resistant silicon dioxide nanoparticle dispersion diffuses into the natural and secondary fracture network of the oil and gas system, disjoins hydrocarbons from surfaces, and fragments the disjoined hydrocarbons into smaller oil droplets. ### Claim 13 (depends on 11) The method of claim 11, wherein the colloidal silica nanoparticles have an average diameter of between about 1 nm and about 100 nm. ### Claim 14 (depends on 11) The method of claim 11, wherein the colloidal silica nanoparticles have an average diameter of between about 12 nm and about 20 nm. ### Claim 15 A method of increasing initial production rates of an oil well, comprising the steps of adding oil well treatment fluids to the well in the order given to the well: a) adding an acid; b) adding a fresh water spacer; c) adding a brine resistant silicon dioxide nanoparticle dispersion pre-pad pill; d) adding a fresh water spacer; and e) inserting a pad of a frac treatment, wherein the added brine resistant silicon dioxide nanoparticle dispersion enhances flow of oil and gas through the oil well beyond induced fracture network, thereby increasing the initial production rates of the oil well by over 20.0% as compared to wells either not treated with a silicon dioxide nanoparticle dispersion technology or treated by nano-emulsion surfactants; and wherein the brine resistant silicon dioxide nanoparticle dispersion comprises surface modified, neutral wet colloidal silica nanoparticles, which penetrate via accelerated diffusion into the reservoir beyond the induced fracture network, wherein the silica nanoparticles are surface modified with trimethoxy[3-(oxiranylmethoxy)propyl] silane, which is in an amount of 2.5% to 5% by weight of the brine resistant silicon dioxide nanoparticle dispersion; and wherein the brine resistant silicon dioxide nanoparticle dispersion is selected such that it has a change in turbidity of less than about 100 NTU after API brine exposure according to an API brine resistance test by use of a turbidimeter. ### Claim 16 (depends on 15) The method of claim 15, wherein the added brine resistant silicon dioxide nanoparticle dispersion diffuses into the natural and secondary fracture network of the oil well, disjoins hydrocarbons from surfaces, and fragments the disjoined hydrocarbons into smaller oil droplets. ### Claim 17 (depends on 15) The method of claim 15, wherein the colloidal silica nanoparticles have an average diameter of between about 1 nm and about 100 nm. ### Claim 18 (depends on 15) The method of claim 15, wherein the colloidal silica nanoparticles have an average diameter of between about 12 nm and about 20 nm.