# US 11,898,090 B2 · Diverting agent and method of filling fracture in well using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,090 B2 - Document ID: US11898090B2 - Status: Granted - Kind: B2 - Application number: 17/563,637 - Filed: 2021-12-28 - Published: 2022-04-21 - Granted: 2024-02-13 - Earliest claimed: 2019-07-03 - Assignees: Mitsubishi Chemical Corporation - Applicants: Mitsubishi Chemical Corporation - Inventors: Chizuko Furo; Yuya Kanamori; Yasuhiro Hirano - Web page: https://patentgrep.com/patent/US11898090B2 ## CPC - C09K 8/508: macromolecular compounds {(C09K8/512 takes precedence)} - C09K 8/5083: {obtained by reactions only involving carbon-to-carbon unsaturated bonds} - C09K 8/68: containing organic compounds - C09K 8/80: Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open - C09K 8/88: macromolecular compounds - E21B 43/26: by forming crevices or fractures - E21B 43/267: reinforcing fractures by propping - 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 A diverting agent which has performance to release filling due to biodegradability, can be quickly removed after a certain period of time, and has an excellent filling property with respect to a fracture in a well is provided. The diverting agent contains particles having a particle diameter of 1,700 μm or more in an amount of 10 to 70 mass %, particles having a particle diameter of 500 μm or more and less than 1,700 μm in an amount of 20 to 80 mass %, and particles having a particle diameter of less than 250 μm in an amount of 5 to 40 mass %, and the diverting agent contains a biodegradable resin in an amount of 10 mass % or more. ## Claims ### Claim 1 A diverting agent comprising: particles having an average particle diameter of 1,700 μm or more in an amount of 10 to 70 mass % relating to the total mass of the diverting agent; particles having an average particle diameter of 500 μm or more and less than 1,700 μm in an amount of 20 to 80 mass % relating to the total mass of the diverting agent; and particles having an average particle of less than 250 μm in an amount of 5 to 40 mass % relating to the total mass of the diverting agent, wherein 10 mass % or more of the diverting agent relating to the total mass of the diverting agent is a biodegradable resin. ### Claim 2 (depends on 1) The diverting agent according to claim 1, wherein when 24 g of the diverting agent is added to 400 mL of a 0.60 mass % aqueous solution of guar gum and dispersed at 23° C. for 60 minutes to obtain a dispersion liquid having a diverting agent concentration of 6 mass %, the dispersion liquid is subjected to pressure dehydration at pressure of 0.4 MPa using a pressure dehydration device including a drainage portion having a slit having a width of 2 mm, an cumulative dehydration amount y with respect to a square root x of a time is obtained, and a regression line represented by the following formula (A) is calculated by a least-squares method from a scatter diagram plotted on a graph in which the square root x of the time is plotted on a horizontal axis and the cumulative dehydration amount y is plotted on a vertical axis, a water permeability coefficient represented by the slope a of the following formula (A) is in a range of 0.0 to 4.0, y=ax+b (A) in the formula (A), y is a cumulative dehydration amount (gram), x is the square root of the time (minutes) elapsed from start of pressurization, a and b are the slope and an intercept of the regression line, and 0