# US 12,110,756 B2 · Modified cement plug and methods of use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,110,756 B2 - Document ID: US12110756B2 - Status: Granted - Kind: B2 - Application number: 18/070,814 - Filed: 2022-11-29 - Published: 2023-06-08 - Granted: 2024-10-08 - Earliest claimed: 2021-12-06 - Applicants: Canadian Casing Accessories Inc. - Inventors: Lyle Laun - Web page: https://patentgrep.com/patent/US12110756B2 ## CPC - E21B 33/1208: {characterised by the construction of the sealing or packing means (E21B33/1277 takes precedence)} - E21B 33/16: using plugs for isolating cement charge; Plugs therefor {(stage cementing E21B33/146; spacer compositions C09K8/424)} - E21B 47/117: Detecting leaks, e.g. from tubing, by pressure testing - E21B 47/11: using tracers; using radioactivity - E21B 2200/08: Down-hole devices using materials which decompose under well-bore conditions - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract An improved wiper plug and methods of using the plug during casing and cementing operations within a subterranean wellbore are provided. The present plugs may pre-loaded with at least one engineered material and operative to release the material over time at a target location within the wellbore, such release serving to enhance the degradation of dissolvable components within the plugs and/or within the casing string, and/or to alter the chemical properties of the wellbore environment. ## Claims ### Claim 1 A wiper plug for use in wiping the inner surface of a casing string positioned within a subterranean wellbore, the plug comprising: at least one tubular body forming a longitudinal bore extending therethrough, the longitudinal bore being temporarily sealed by at least one dissolvable disc to form a chamber for receiving and containing at least one engineered material; at least one annular wiper fin mounted to the tubular body and extending radially outwardly therefrom to engage the inner surface of the casing string, and at least one engineered material received within the at least one chamber for controllably degrading the at least one dissolvable disc, releasing the at least one engineered material into the longitudinal bore to further controllably degrade at least one dissolvable component positioned within the wellbore. ### Claim 2 (depends on 1) The wiper plug of claim 1, wherein the at least one tubular body comprises at least two tubulars forming the sealed chamber within the longitudinal bore, and wherein one of the at least two tubulars, comprises the at least one dissolvable disc. ### Claim 3 (depends on 1) The wiper plug of claim 1, wherein the at least one dissolvable disc is manufactured from a degradable metal alloy. ### Claim 4 (depends on 3) The wiper plug of claim 3, wherein the at least one engineered material comprises a catalytic material for enhancing the degradation of the at least one dissolvable disc. ### Claim 5 (depends on 1) The wiper plug of claim 1, wherein the at least one tubular body comprises at least three tubulars forming the sealed chamber within the longitudinal bore, and wherein one of the at least three tubulars further comprises at least one lid temporarily secured thereto. ### Claim 6 (depends on 5) The wiper plug of claim 5, wherein the at least one lid is manufactured from elastomeric materials, dissolvable materials, or a combination thereof. ### Claim 7 (depends on 6) The wiper plug of claim 6, wherein the at least one lid is manufactured from be manufactured from thin, solid or nearly solid, pliable synthetic materials such as a synthetic vinyl, including polyvinyl alcohol (PVA) plastic, a thermoplastic polymer, polyglycolide or poly(glycolic acid) PGA, from one or more elastomeric materials, or a combination thereof. ### Claim 8 (depends on 1) The wiper plug of claim 1, wherein the at least one wiper fin is formed from at least two fin materials. ### Claim 9 (depends on 8) The wiper plug of claim 8, wherein the at least two fin materials comprise at least one elastomeric material, at least one dissolvable material, or a combination thereof. ### Claim 10 A method of delivering at least one engineered material to a target location in a casing string positioned in a subterranean wellbore, the method comprising: providing at least one wiper plug having a body forming a longitudinal bore, the longitudinal bore forming at least one chamber for receiving and containing the at least one engineered material, and at least one dissolvable disc, loading the chamber of the at least one wiper plug with the at least one engineered material, launching the at least one wiper plug into the casing string and allowing the at least one wiper plug to wipe the casing string as the at least one wiper plug passes therethrough, landing and securing the wiper plug at or near the target location, and allowing the at least one engineered material to degrade the at least one dissolvable disc and controllably release the at least one engineered material into the wellbore, wherein the release of the at least one engineered material further controllably degrades at least one dissolvable component positioned within the wellbore. ### Claim 11 (depends on 10) The method of claim 10, wherein the at least one wiper plug further comprises at least one annular wiper fin to wipe an inner surface of the casing string. ### Claim 12 (depends on 11) The method of claim 11, wherein the wiper fin is formed from at least two materials. ### Claim 13 (depends on 12) The method of claim 12, wherein the at least two materials comprise at least one elastomeric material, at least one dissolvable material, or a combination thereof. ### Claim 14 (depends on 10) The method of claim 10, wherein the at least one engineered material is a catalytic material for enhancing the degradation of the at least one dissolvable disc. ### Claim 15 (depends on 10) The method of claim 10, wherein the release of the at least one engineered material occurs at a predetermined time and a predetermined rate. ### Claim 16 (depends on 10) The method of claim 10, wherein the release of the at least one engineered material further controllably alters the chemical properties of fluids in the wellbore. ### Claim 17 (depends on 10) The method of claim 10, wherein, prior to the release of the at least one engineered material, integrity testing of the casing string is performed. ### Claim 18 (depends on 10) The method of claim 10, wherein gases produced from the degradation of the at least one dissolvable disc is controllably vented from the at least one wiper plug. ### Claim 19 (depends on 10) The method of claim 10, wherein the at least one wiper plug is further be loaded with at least one tracer material.