# US 11,898,439 B2 · Double-layered wellbore tubular assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,439 B2 - Document ID: US11898439B2 - Status: Granted - Kind: B2 - Application number: 17/751,968 - Filed: 2022-05-24 - Published: 2023-11-30 - Granted: 2024-02-13 - Earliest claimed: 2022-05-24 - Assignees: Saudi Arabian Oil Company - Applicants: Saudi Arabian Oil Company - Inventors: Ahmed Abdulaziz Al-Mousa; Omar M. Al Hamid; Mohamed A. Al Ammari - Web page: https://patentgrep.com/patent/US11898439B2 ## CPC - E21B 47/10: Locating fluid leaks, intrusions or movements - E21B 47/117: Detecting leaks, e.g. from tubing, by pressure testing - E21B 17/003: {with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence)} - E21B 17/18: Pipes provided with plural fluid passages {(E21B17/203 takes precedence)} - E21B 33/13: Methods or devices for cementing, for plugging holes, crevices or the like - E21B 47/06: Measuring temperature or pressure - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A double-layered wellbore tubular assembly includes a first wellbore tubular configured to be lowered into and installed within a wellbore. The first wellbore tubular has an inner diameter and defines a first hollow volume. The assembly includes a second wellbore tubular configured to be lowered into and installed within the first hollow volume of the first wellbore tubular. The second wellbore tubular has an outer diameter smaller than the inner diameter of the first wellbore tubular. The second wellbore tubular installed within the first hollow volume defines a tubing-to-tubing annulus (TTA) between an outer wall of the second wellbore tubular and an inner wall of the first wellbore tubular. ## Claims ### Claim 1 A method comprising: forming a wellbore assembly by: installing a second wellbore tubular within a hollow volume defined by a first wellbore tubular, wherein the second wellbore tubular installed within the hollow volume defines a tubing-to-tubing annulus (TTA) between an outer wall of the second wellbore tubular and an inner wall of the first wellbore tubular, attaching a first connection at a first end of the wellbore assembly, the first connection attached to the first wellbore tubular and the second wellbore tubular, the first connection coupling the first end of the wellbore assembly to a wellbore tool, and attaching a second connection at a second end of the wellbore assembly opposite the first end of the wellbore assembly, the second connection attached to the first wellbore tubular and the second wellbore tubular, the second connection coupling the second end of the wellbore assembly to a wellbore tool; installing the wellbore assembly within a wellbore; while performing wellbore operations within the wellbore, periodically measuring a pressure within the TTA; and based on a result of periodically measuring the pressure within the TTA, determining a leak in the second wellbore tubular. ### Claim 2 (depends on 1) The method of claim 1, wherein periodically measuring the pressure within the TTA comprises: installing a pressure cable within the TTA when forming the wellbore assembly; and coupling the pressure cable to a pressure gauge installed at a surface of the wellbore. ### Claim 3 (depends on 1) The method of claim 1, wherein based on the result of periodically measuring the pressure within the TTA, determining the leak in the second wellbore tubular comprises determining that the pressure within the TTA exceeds a pressure threshold. ### Claim 4 (depends on 3) The method of claim 3, wherein determining the leak in the second wellbore tubular comprises determining the leak at a first time instant, wherein the method comprises, based on the result of periodically measuring the pressure within the TTA, determining an absence of the leak in the second wellbore tubular at a second time instant different from the first time instant. ### Claim 5 (depends on 4) The method of claim 4, wherein determining the absence of the leak comprises determining that the pressure within the TTA does not exceed the pressure threshold. ### Claim 6 (depends on 1) The method of claim 1, wherein determining the leak in the second wellbore tubular comprises determining a crack in an outer wall of the second wellbore tubular, wherein the method comprises pumping, from a surface of the wellbore and into the TTA, a sealing material to seal the crack in the outer wall of the second wellbore tubular. ### Claim 7 (depends on 1) The method of claim 1, wherein performing wellbore operations within the wellbore comprises producing wellbore fluids comprising hydrocarbons through the wellbore assembly. ### Claim 8 A wellbore assembly comprising: a first wellbore tubular configured to be lowered into and installed within a wellbore, the first wellbore tubular having an inner diameter and defining a first hollow volume; a second wellbore tubular configured to be lowered into and installed within the first hollow volume of the first wellbore tubular, the second wellbore tubular having an outer diameter smaller than the inner diameter of the first wellbore tubular, wherein the second wellbore tubular installed within the first hollow volume defines a tubing-to-tubing annulus (TTA) between an outer wall of the second wellbore tubular and an inner wall of the first wellbore tubular; a pressure gauge coupled to the wellbore assembly to measure a pressure within the TTA; a pressure cable positioned within the TTA and coupled to the pressure gauge; a first connection at a first end of the wellbore assembly, the first connection attached to the first wellbore tubular and the second wellbore tubular, the first connection configured to couple the first end of the wellbore assembly to a wellbore tool; and a second connection at a second end of the wellbore assembly opposite the first end of the wellbore assembly, the second connection attached to the first wellbore tubular and the second wellbore tubular, the second connection configured to couple the second end of the wellbore assembly to a wellbore tool. ### Claim 9 (depends on 8) The wellbore assembly of claim 8, wherein the first wellbore tubular and the second wellbore tubular have the same length.