# US 11,306,559 B2 · Degradable anchoring device with gavanic corrosion resistant component interface > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,559 B2 - Document ID: US11306559B2 - Status: Granted - Kind: B2 - Application number: 16/680,789 - Filed: 2019-11-12 - Published: 2021-05-13 - Granted: 2022-04-19 - Earliest claimed: 2019-11-12 - Assignees: Baker Hughes Oilfield Operations LLC - Applicants: Zhihui Zhang; YingQing Xu; Zhiyue Xu - Inventors: Zhihui Zhang; YingQing Xu; Zhiyue Xu - Web page: https://patentgrep.com/patent/US11306559B2 ## CPC - E21B 33/134: Bridging plugs - E21B 33/129: with mechanical slips for hooking into the casing (E21B33/122, E21B33/124 take precedence) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract An anchoring device comprises a degradable substrate; and a ceramic biting member secured to an outer surface of the degradable substrate and configured for engagement with another member, the ceramic biting member comprising a ceramic material which has a density of greater than about 90% of theoretical density and contains one or more of the following: Al2O3; MgO; CaO; SiO2; TiO2; Y2O3; ZrO2; SiC; BN, or Si3N4. ## Claims ### Claim 1 An anchoring device, comprising: a degradable substrate; and a ceramic biting member secured to an outer surface of the degradable substrate and configured for engagement with another member, the ceramic biting member comprising a ceramic material which has a density of greater than about 90% of theoretical density and contains one or more of the following: Al2O3; MgO; CaO; SiO2; TiO2; Y2O3; ZrO2; SiC; BN, or Si3N4, wherein the ceramic biting member has a plurality of openings, a plurality of grooves, or a combination thereof. ### Claim 2 (depends on 1) The anchoring device of claim 1, wherein the degradable substrate has a corrosion rate of about 0.1 to about 450 mg/cm2/hour using an aqueous 3 wt % KCl solution at 200° F. ### Claim 3 (depends on 1) The anchoring device of claim 1, wherein the ceramic biting member at least partially covers the outer surface of the degradable substrate, and the outer surface of the degradable substrate that is covered by the ceramic biting member is resistant to galvanic corrosion. ### Claim 4 (depends on 3) The anchoring device of claim 3, wherein the outer surface of the degradable substrate that is covered by the ceramic biting member has a corrosion rate of less than 0.01 mg/cm2/hour using an aqueous 3 wt % KCl solution at 200° F. ### Claim 5 (depends on 1) The anchoring device of claim 1, wherein the ceramic material has a density of greater than about 95% of theoretical density. ### Claim 6 (depends on 1) The anchoring device of claim 1, wherein the ceramic material has an open porosity of less than about 1%. ### Claim 7 (depends on 1) The anchoring device of claim 1, wherein the ceramic material is free of open pores. ### Claim 8 (depends on 1) The anchoring device of claim 1, wherein the ceramic biting member is a sintered one piece component. ### Claim 9 (depends on 1) The anchoring device of claim 1, wherein the ceramic biting member has a wall thickness of about 1/32 inch to about 1/16 inch. ### Claim 10 (depends on 1) The anchoring device of claim 1, wherein the ceramic biting member has the plurality of openings, each opening having an open area on an outer surface of the ceramic biting member, and the sum of the open area is about 5 to about 70% based on a total area of the outer surface of the ceramic biting member. ### Claim 11 (depends on 1) The anchoring device of claim 1, wherein the degradable substrate comprises greater than about 50 wt % of one or more of the following: Zn; Mg; Al; or Mn based on the total weight of the degradable substrate. ### Claim 12 (depends on 11) The anchoring device of claim 11, wherein the degradable substrate further comprises greater than about 0.05 wt % to less than about 50 wt % of one or more of the following: Ni; W; Mo; Cu; Fe; Cr; or Co based on the total weight of the degradable substrate. ### Claim 13 (depends on 1) The anchoring device of claim 1, further comprising an adhesive layer disposed between the degradable substrate and the ceramic biting member. ### Claim 14 (depends on 13) The anchoring device of claim 13, wherein the adhesive layer comprises one or more of the following: an acrylonitrile; a cyanoacrylate; an acrylic; an epoxy; a phenolic; a polyester; or a silicone. ### Claim 15 (depends on 1) The anchoring device of claim 1, wherein the degradable substrate is in direct physical contact with the ceramic biting member. ### Claim 16 (depends on 15) The anchoring device of claim 15, wherein there is no adhesive between the substrate and the ceramic biting member. ### Claim 17 (depends on 1) The anchoring device of claim 1, wherein the degradable substrate has a corrosion rate of about 0.1 to about 450 mg/cm2/hour using an aqueous 3 wt % KCl solution at 200° F., and the outer surface of the degradable substrate that is covered by the ceramic biting member has a corrosion rate of less than 0.01 mg/cm2/hour using an aqueous 3 wt % KCl solution at 200° F. ### Claim 18 (depends on 1) A downhole assembly comprising the anchoring device of claim 1. ### Claim 19 (depends on 18) The downhole assembly of claim 18, wherein the downhole assembly is a frac plug or a bridge plug. ### Claim 20 (depends on 18) The downhole assembly of claim 18, wherein the degradable substrate has a corrosion rate of about 0.1 to about 450 mg/cm2/hour using an aqueous 3 wt % KCl solution at 200° F., and the outer surface of the degradable substrate that is covered by the ceramic biting member has a corrosion rate of less than 0.01 mg/cm2/hour using an aqueous 3 wt % KCl solution at 200° F.