# US 11,078,750 B2 · Plug system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,750 B2 - Document ID: US11078750B2 - Status: Granted - Kind: B2 - Application number: 16/109,459 - Filed: 2018-08-22 - Published: 2020-02-27 - Granted: 2021-08-03 - Earliest claimed: 2018-08-22 - Assignees: Weatherford Technology Holdings, LLC - Applicants: Weatherford Technology Holdings, LLC - Inventors: Richard Lee Giroux - Web page: https://patentgrep.com/patent/US11078750B2 ## CPC - E21B 33/14: for cementing casings into boreholes - E21B 33/124: Units with longitudinally-spaced plugs for isolating the intermediate space - E21B 33/126: with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence) - E21B 34/06: in wells - E21B 34/063: {Valve or closure with destructible element, e.g. frangible disc (E21B34/103 takes precedence)} - E21B 2200/06: Sleeve valves - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A system for cementing a tubular within a wellbore includes a connector; a tubular housing attached to the connector and disposed in the tubular; and a plug disposed in the tubular housing and releasably attached to the tubular housing. ## Claims ### Claim 1 A method of cementing a tubular in a wellbore, comprising: coupling a plug system to the tubular, the plug system including: a connector coupled to the tubular; a tubular housing attached to the connector and at least partially disposed in the tubular; and a first plug disposed in the tubular housing and releasably attached to the tubular housing; after the tubular housing is placed within the wellbore, releasing the first plug from the tubular housing by landing a sealing object in the first plug; opening a port in the first plug; and flowing cement through the port, out of the tubular, and into an annulus between the tubular and the wellbore. ### Claim 2 (depends on 1) The method of claim 1, wherein the plug system includes a second plug disposed in the tubular housing and releasably attached to the tubular housing. ### Claim 3 (depends on 2) The method of claim 2, further comprising releasing the second plug from the tubular housing after releasing the first plug. ### Claim 4 (depends on 1) The method of claim 1, wherein opening a port comprises applying pressure to break a rupturable member blocking the port. ### Claim 5 (depends on 4) The method of claim 4, wherein opening a port further comprises flowing cement around the sealing object to break the rupturable member. ### Claim 6 (depends on 1) The method of claim 1, wherein the first plug includes an upper body and a lower body, and the upper body is attached to the tubular housing. ### Claim 7 (depends on 6) The method of claim 6, further comprising coupling the upper body to the lower body using a seat sleeve. ### Claim 8 (depends on 7) The method of claim 7, wherein the seat sleeve includes an upper sleeve releasably attached to a lower sleeve. ### Claim 9 (depends on 3) The method of claim 3, wherein a pressure differential for releasing the second plug is the same or lower than a pressure differential for releasing the first plug. ### Claim 10 (depends on 9) The method of claim 9, wherein opening a port comprises applying pressure to break a rupturable member blocking the port. ### Claim 11 (depends on 10) The method of claim 10, wherein opening a port further comprises flowing cement around the sealing object to break the rupturable member. ### Claim 12 (depends on 9) The method of claim 9, wherein the first plug includes an upper body and a lower body, and the upper body is attached to the tubular housing. ### Claim 13 (depends on 12) The method of claim 12, further comprising coupling the upper body to the lower body using a seat sleeve. ### Claim 14 (depends on 13) The method of claim 13, wherein the seat sleeve includes an upper sleeve releasably attached to a lower sleeve. ### Claim 15 (depends on 1) The method of claim 1, further comprising, prior to releasing the plug, flowing fluid through a bore in the first plug. ### Claim 16 (depends on 1) The method of claim 1, wherein the first plug is releasably attached to a portion of the tubular housing that overlaps with the tubular. ### Claim 17 (depends on 16) The method of claim 16, further comprising a second plug disposed inside of and releasably attached to the portion of the tubular housing that overlaps with the tubular. ### Claim 18 (depends on 16) The method of claim 16, wherein the connector is attached to a conveyance string, and the method further comprises lowering the plug system and the tubular into the wellbore using the conveyance string. ### Claim 19 (depends on 18) The method of claim 18, wherein the sealing object is released into the conveyance string before landing in the first plug. ### Claim 20 (depends on 1) The method of claim 1, wherein releasing the first plug from the tubular housing further comprises: creating a differential pressure across the first plug by applying a pressure to the sealing object after landing the sealing object in the first plug; preventing the pressure from communicating into an annular area between the tubular housing and the tubular by a seal member located within the tubular housing above the first plug; and breaking an attachment between the first plug and the tubular housing by a force resulting from the differential pressure.