# US 10,767,106 B2 · Viscosity reduction system for microwave extraction of heavy oil and preparation method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,106 B2 - Document ID: US10767106B2 - Status: Granted - Kind: B2 - Application number: 16/813,581 - Filed: 2020-03-09 - Published: 2020-07-02 - Granted: 2020-09-08 - Earliest claimed: 2019-04-12 - Assignees: China University of Petroleum - Applicants: China University of Petroleum - Inventors: Zhaomin Li; Zhengxiao Xu; Teng Lu; Mingxuan Wu; Xinru Zhao; Aiwen Jing - Web page: https://patentgrep.com/patent/US10767106B2 ## CPC - C09K 8/592: Compositions used in combination with generated heat, e.g. by steam injection - C01B 32/198: Graphene oxide - C09K 8/032: {Inorganic additives} - C09K 8/58: Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids - C09K 8/584: characterised by the use of specific surfactants - H01F 1/0063: {in a non-magnetic matrix, e.g. granular solids (granular films H01F10/007)} - C09K 2208/10: Nanoparticle-containing well treatment fluids - E21B 43/24: using heat, e.g. steam injection - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract Disclosed belongs to the technical field of heavy oil extraction, and specifically relates to a viscosity reduction system for microwave extraction of heavy oil and a preparation method thereof. The viscosity reduction system is a magnetic graphene oxide. The viscosity reduction system added to heavy oil has a significant viscosity reduction effect after microwave treatment. The viscosity reduction system exhibits lipophilicity and can be adsorbed on oil droplets, so that the thermal effect of microwaves assisted by the viscosity reduction system mainly acts on a reservoir, which reduces heat loss during heat transfer. At the same time, the viscosity reduction system is magnetic, which helps directional regulation and separation under the action of a magnetic field. ## Claims ### Claim 1 A viscosity reduction system for microwave extraction of heavy oil, wherein the viscosity reduction system is a magnetic graphene oxide; wherein the magnetic graphene oxide is compounded by Fe3O4 nanospheres and a graphene oxide; wherein the mass ratio of the Fe3O4 nanospheres to the graphene oxide is 2:1; the viscosity reduction system is produced by the following steps: (1) preparing a catalyst suspension: adding the Fe3O4 nanospheres into deionized water to obtain a suspension, and adjusting the suspension to be acidic by an acid to obtain a catalyst suspension; (2) preparing a carrier solution: adding graphene oxide into deionized water, and stirring to obtain a graphene oxide carrier solution; (3) placing the catalyst suspension obtained in step (1) in a flask, introducing nitrogen into the flask, and heating in a constant temperature water bath of 60° C.; (4) adding the graphene oxide carrier solution into the flask heated in the constant temperature water bath of step (3) dropwise while stirring to obtain a mixed solution; wherein the weight ratio of the graphene oxide carrier solution to the catalyst suspension is 1:2; (5) placing the mixed solution obtained in step (4) in an infiltration bag to obtain a magnetic graphene oxide precipitate; and (6) placing the magnetic graphene oxide precipitate obtained in step (5) in a vacuum oven for drying to obtain the viscosity reduction system. ### Claim 2 (depends on 1) The viscosity reduction system for microwave extraction of heavy oil according to claim 1, wherein the diameter of the Fe3O4 nanospheres is 10 to 20 nm. ### Claim 3 (depends on 1) The viscosity reduction system for microwave extraction of heavy oil according to claim 1, wherein the graphene oxide has 1 to 2 layers and a diameter of 1 to 5 μm. ### Claim 4 (depends on 1) The viscosity reduction system for microwave extraction of heavy oil according to claim 1, wherein in step (1), the Fe3O4 nanospheres are 0.4 to 1 g, and the deionized water is 200 mL; in step (2), the graphene oxide is 0.2 to 0.5 g, and the deionized water is 100 mL; and in step (4), the graphene oxide carrier solution is 100 parts by weight, and the catalyst suspension is 200 parts by weight. ### Claim 5 (depends on 1) The viscosity reduction system for microwave extraction of heavy oil according to claim 1, wherein in step (1), the Fe3O4 nanospheres are 0.5 g; and in step (2), the graphene oxide is 0.25 g. ### Claim 6 (depends on 1) The viscosity reduction system for microwave extraction of heavy oil according to claim 1, wherein in step (1), the pH value of the suspension is adjusted to 3 to 5 by 1 mol/L hydrochloric acid. ### Claim 7 (depends on 1) The viscosity reduction system for microwave extraction of heavy oil according to claim 1, wherein the stirring in step (2) is magnetic stirring, the revolving speed is 400 to 600 rpm, the stirring time is 0.5 to 1 h, and the stirring temperature is 20 to 30° C.; the flask in step (3) is a three-necked flask, and the inflow rate of nitrogen is 0.3 to 0.5 L/min; the stirring in step (4) is intense stirring, and the revolving speed is 800 to 1200 rpm; and vacuum drying is performed at 50° C. in step (6).