# US 2020/0399524 A1 · Mitigating annular pressure buildup with nanoporous metal oxides > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399524 A1 - Document ID: US20200399524A1 - Status: Published application - Kind: A1 - Application number: 16/975,328 - Filed: 2018-05-30 - Published: 2020-12-24 - Earliest claimed: 2018-04-05 - Assignees: Halliburton Energy Services, Inc. - Applicants: Halliburton Energy Services, Inc, - Inventors: Thomas J. PISKLAK; Samuel J. LEWIS; William C. PEARL, JR. - Web page: https://patentgrep.com/patent/US20200399524A1 ## CPC - C09K 8/40: Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses - B01J 20/226: {Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF] (preparation of metal complexes containing carboxylic acid moieties C07C51/418; MOF's per se C07F)} - B01J 35/643: {less than 2 nm} - C09K 8/592: Compositions used in combination with generated heat, e.g. by steam injection - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - B82Y 40/00: Manufacture or treatment of nanostructures - C09K 2208/10: Nanoparticle-containing well treatment fluids - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract Methods and systems for mitigating annular pressure buildup in a wellbore are provided. An example method comprises introducing a treatment fluid into an annulus of the wellbore, wherein the annulus has an annular pressure, and wherein the treatment fluid comprises an aqueous base fluid and a nanoporous metal oxide. The method further comprises allowing or causing to allow at least a portion of the treatment fluid to remain in the annulus; and allowing or causing to allow the annular pressure to increase thereby inducing at least a portion of the aqueous base fluid to enter into an interior volume of the nanoporous metal oxide. ## Claims ### Claim 1 A method of mitigating annular pressure buildup in a wellbore, the method comprising: introducing a treatment fluid into an annulus of the wellbore, wherein the annulus has an annular pressure, wherein the treatment fluid comprises an aqueous base fluid and a nanoporous metal oxide; allowing or causing to allow at least a portion of the treatment fluid to remain in the annulus; and allowing or causing to allow the annular pressure to increase thereby inducing at least a portion of the aqueous base fluid to enter into an interior volume of the nanoporous metal oxide. ### Claim 2 (depends on 1) The method of claim 1, wherein the nanoporous metal oxide is a zeolite. ### Claim 3 (depends on 1) The method of claim 1, wherein the nanoporous metal oxide is a metal organic framework. ### Claim 4 (depends on 1) The method of claim 1, wherein the nanoporous metal oxide comprises a pore size of about 0.2 to about 2 nm. ### Claim 5 (depends on 1) The method of claim 1, wherein the nanoporous metal oxide is present in the treatment fluid in a concentration of about 0.01 wt. % to about 20 wt. %. ### Claim 6 (depends on 1) The method of claim 1, further comprising displacing a first fluid present in the wellbore with the treatment fluid. ### Claim 7 (depends on 6) The method of claim 6, further comprising introducing a second fluid after the treatment fluid is introduced into the wellbore. ### Claim 8 (depends on 1) The method of claim 1, further comprising drilling the wellbore with the treatment fluid. ### Claim 9 (depends on 1) The method of claim 1, further comprising allowing or causing to allow the annular pressure to decrease thereby inducing at least a portion of the aqueous base fluid to exit the interior volume of the nanoporous metal oxide. ### Claim 10 (depends on 1) The method of claim 1, further comprising allowing or causing to allow the annular pressure to decrease thereby inducing at least a portion of the aqueous base fluid to exit the interior volume of the nanoporous metal oxide, and repeating the allowing or causing to allow the annular pressure to increase thereby inducing at least a portion of the aqueous base fluid to enter into the interior volume of the nanoporous metal oxide. ### Claim 11 (depends on 1) The method of claim 1, wherein the annular pressure is less than a casing collapse pressure of a casing adjacent to the annulus after the portion of the aqueous base fluid has entered into the interior volume of the nanoporous metal oxide. ### Claim 12 A spacer fluid comprising: an aqueous base fluid, and a nanoporous metal oxide. ### Claim 13 (depends on 12) The spacer fluid of claim 12, wherein the nanoporous metal oxide is a zeolite. ### Claim 14 (depends on 12) The spacer fluid of claim 12, wherein the nanoporous metal oxide is a metal organic framework. ### Claim 15 (depends on 12) The spacer fluid of claim 12, wherein the nanoporous metal oxide comprises a pore size of about 0.2 to about 2 nm. ### Claim 16 (depends on 12) The spacer fluid of claim 12, wherein the nanoporous metal oxide is present in the treatment fluid in a concentration of about 0.01 wt. % to about 20 wt. %. ### Claim 17 A system for mitigating annular pressure buildup in a wellbore; the system comprising: a treatment fluid comprising: an aqueous base fluid, and a nanoporous metal oxide; mixing equipment capable of mixing the aqueous base fluid and nanoporous metal oxide to provide the treatment fluid; and pumping equipment capable of delivering the treatment fluid into an annulus of a wellbore. ### Claim 18 (depends on 17) The system of claim 17, wherein the wellbore is a wellbore for a geothermal well. ### Claim 19 (depends on 17) The system of claim 17, wherein the wellbore is shut-in. ### Claim 20 (depends on 17) The system of claim 17, further comprising cyclic steam injection equipment capable of injecting steam into the wellbore in cycles.