# US 11,898,084 B2 · Suspension supporting additive for water-based drilling and completions fluids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,084 B2 - Document ID: US11898084B2 - Status: Granted - Kind: B2 - Application number: 17/410,119 - Filed: 2021-08-24 - Published: 2021-12-23 - Granted: 2024-02-13 - Earliest claimed: 2018-09-04 - Assignees: Saudi Arabian Oil Company - Applicants: Saudi Arabian Oil Company - Inventors: Hasmukh Patel; Ashok Santra; Carl Thaemlitz - Web page: https://patentgrep.com/patent/US11898084B2 ## CPC - C09K 8/16: characterised by the inorganic compounds other than clay - E21B 21/003: {Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138)} - C09K 8/145: {characterised by the composition of the clay} - C09K 8/206: {Derivatives of other natural products, e.g. cellulose, starch, sugars} - C09K 8/24: Polymers - E21B 21/00: Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) - 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 Methods and compositions for modified well fluids. One method including combining an amount of a synthetic functionalized additive with an intermediate well fluid composition to form a synthetic functionalized additive-containing well fluid composition; the synthetic functionalized additive comprising a synthetic layered magnesium silicate that is covalently bonded to a functional group, and the intermediate well fluid composition comprising a water-based continuous phase with solid particles, wherein the synthetic functionalized additive increases suspension stability of the solid particles versus a well fluid composition comprising the solid particles without the synthetic functionalized additive. ## Claims ### Claim 1 A method of making a modified well fluid, the method comprising: combining an amount of a synthetic functionalized additive with an intermediate well fluid composition to form a synthetic functionalized additive-containing well fluid composition; the synthetic functionalized additive comprising a synthetic layered magnesium silicate that is covalently bonded to a functional group, and the intermediate well fluid composition comprising a water-based continuous phase with solid particles, wherein the synthetic functionalized additive increases suspension stability of the solid particles versus a well fluid composition comprising the solid particles without the synthetic functionalized additive, wherein the intermediate well fluid composition comprises a sodium bromide brine, and comprises a biopolymeric viscosifier at between about 0.05 to about 2 lbs./bbl. of the brine; a fluid loss control additive at between about 0.1 to about 7 lbs./bbl. of the brine; a polycation at between about 0.1 to about 5 lbs/bbl. of the brine; a anionic surfactant at between about 0.1 to about 5 lbs./bbl. of the brine; a solid densifier at between about 0.1 to about 10 lbs./bbl of the brine; a pH additive; and the synthetic functionalized additive at between about 0.1 to about 10 lbs./bbl. of the brine, and wherein the modified well fluid has a density between about 8 to about 22 lbs./gal. ### Claim 2 (depends on 1) The method of claim 1, wherein the functional group that is covalently bonded to the synthetic layered magnesium silicate is selected from the group consisting of hydroxyl groups (—OH), amine groups, and combinations of the same. ### Claim 3 (depends on 1) The method of claim 1, wherein the intermediate well fluid composition further comprises a polycation component and an anionic surfactant component. ### Claim 4 (depends on 3) The method of claim 3, wherein the polycation component comprises partially hydrolyzed polyacrylamide. ### Claim 5 (depends on 3) The method of claim 3, wherein the anionic surfactant component comprises an alkylbenzene sulfonate. ### Claim 6 (depends on 5) The method of claim 5, wherein the anionic surfactant component comprises sodium dodecylbenzene sulfonate. ### Claim 7 (depends on 1) The method of claim 1, wherein the synthetic functionalized additive increases suspension stability of the solid particles versus the well fluid composition comprising the solid particles without the synthetic functionalized additive after hot rolling the modified well fluid at about at least 275° F. and about 500 psig for about at least 16 hours. ### Claim 8 (depends on 1) The method of claim 1, wherein the modified well fluid composition does not have hydrocarbon components such as hydrocarbon solvents added. ### Claim 9 (depends on 1) The method of claim 1, wherein the synthetic functionalized additive is not functionalized by hydrophobic functional groups. ### Claim 10 A modified well fluid composition, the composition comprising: a water-based fluid with solid particles in suspension; and a synthetic layered magnesium silicate, the synthetic layered magnesium silicate comprising: a first functionalized silicate layer, the first functionalized silicate layer comprising a tetrahedral silicate layer and a functional group, an octahedral brucite layer, the octahedral brucite layer comprising magnesium oxide/hydroxide, and a second functionalized silicate layer, the second functionalized silicate layer comprising the tetrahedral silicate layer and the functional group, wherein the octahedral brucite layer is positioned between the first functionalized silicate layer and the second functionalized silicate layer, and wherein the functional group extends from both the first functionalized silicate layer and the second functionalized silicate layer away from the octahedral brucite layer. ### Claim 11 (depends on 10) The composition of claim 10, wherein the functional group is selected from the group consisting of hydroxyl groups (—OH), amine groups, and combinations of the same. ### Claim 12 (depends on 10) The composition of claim 10, wherein the modified well fluid composition further comprises a cationic component and an anionic surfactant component. ### Claim 13 (depends on 12) The composition of claim 12, wherein the cationic component comprises partially hydrolyzed polyacrylamide. ### Claim 14 (depends on 12) The composition of claim 12, wherein the anionic surfactant component comprises an alkylbenzene sulfonate. ### Claim 15 (depends on 14) The composition of claim 14, wherein the alkylbenzene sulfonate comprises a compound selected from the group consisting of: sodium dodecylbenzene sulfonate, dodecyl sulfonate, and combination of the same. ### Claim 16 (depends on 10) The composition of claim 10, wherein the modified well fluid composition further comprises a biopolymer selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose, guar gum, hydroxypropyl guar, xanthan gum, and combinations of the same. ### Claim 17 (depends on 10) The composition of claim 10, wherein the water-based fluid comprises at least one component selected from the group consisting of: brine; a biopolymeric viscosifier; a fluid loss control additive; a polycation; an anionic surfactant; a solid densifier; and a pH adjustment additive. ### Claim 18 (depends on 17) The composition of claim 17, wherein the water-based fluid comprises a sodium bromide brine, and comprises the biopolymeric viscosifier at between about 0.05 to about 2 lbs./bbl. of the brine; the fluid loss control additive at between about 0.1 to about 7 lbs./bbl. of the brine; the polycation at between about 0.1 to about 5 lbs/bbl. of the brine; the anionic surfactant at between about 0.1 to about 5 lbs./bbl. of the brine; the solid densifier at between about 0.1 to about 10 lbs./bbl of the brine; and the synthetic layered magnesium silicate at between about 0.1 to about 10 lbs./bbl. of the brine, wherein the modified well fluid composition has a density between about 8 to about 22 lbs./gal. ### Claim 19 (depends on 10) The composition of claim 10, wherein the synthetic layered magnesium silicate increases suspension stability of the solid particles versus the well fluid composition comprising the solid particles without the synthetic functionalized additive after hot rolling the modified well fluid at about at least 275° F. and about 500 psig for about at least 16 hours. ### Claim 20 (depends on 10) The composition of claim 10, wherein the modified well fluid composition does not have hydrocarbon components such as hydrocarbon solvents added. ### Claim 21 (depends on 10) The composition of claim 10, wherein the synthetic layered magnesium silicate does not exhibit hydrophobic functional groups. ### Claim 22 (depends on 10) A method of drilling a well in a subterranean formation, the method comprising: supplying the modified well fluid composition of claim 10 to a drill string; and operating the drill string such that the modified well fluid composition is conducted to a bottom hole assembly having a drill bit, and such that the drill bit drills into the subterranean formation. ### Claim 23 A method of making a modified well fluid, the method comprising: combining an amount of a synthetic functionalized additive with an intermediate well fluid composition to form a synthetic functionalized additive-containing well fluid composition; the intermediate well fluid composition comprising a water-based continuous phase with solid particles, wherein the synthetic functionalized additive increases suspension stability of the solid particles versus a well fluid composition comprising the solid particles without the synthetic functionalized additive, and the synthetic functionalized additive comprising a synthetic layered magnesium silicate, the synthetic layered magnesium silicate comprising: a first functionalized silicate layer, the first functionalized silicate layer comprising a tetrahedral silicate layer and a functional group, an octahedral brucite layer, the octahedral brucite layer comprising magnesium oxide/hydroxide, and a second functionalized silicate layer, the second functionalized silicate layer comprising the tetrahedral silicate layer and the functional group, wherein the octahedral brucite layer is positioned between the first functionalized silicate layer and the second functionalized silicate layer, and wherein the functional group extends from both the first functionalized silicate layer and the second functionalized silicate layer away from the octahedral brucite layer.