Modular downhole plug tool

{
  "publication_number": "US11448035B1",
  "country": "US",
  "kind": "B1",
  "title": "Modular downhole plug tool",
  "abstract": "A pressure-isolation device has a plug for isolating pressure within a wellbore. The plug can include one or more modular mandrel assemblies partially disposed within each other. Each mandrel assembly can include a sealing element and a shear pin for setting the mandrel section. Each mandrel assembly can also have a collar element, a shear sleeve, a mandrel stop element, and a back-up ring in contact with the sealing element. The plug can further include a bottom receiving element including a knockout plug. The plug assembly can include a top catch element for setting and pulling the plug.",
  "claims": [
    "1. A device, comprising: a main body having a top end and a bottom end, and the main body is substantially cylindrical; the main body comprises a first diameter adjacent the top end, a second diameter adjacent the bottom end, and the first diameter is larger than the second diameter; the main body further comprises a tapered section between its first diameter and its second diameter; at least one sealing element disposed about the main body; a receiving body that is substantially cylindrical; a shear pin disposed within the receiving body; and the main body is at least partially disposed within the receiving body, and a collar element is at least partially disposed within the receiving body; and the shear pin is further disposed within a shear sleeve, the shear sleeve at least partially disposed within the receiving body.",
    "2. The device of claim 1, wherein the collar element is disposed about the main body between the sealing element and the receiving body.",
    "3. The device of claim 1, further comprising at least one back-up ring in contact with the sealing element.",
    "4. The device of claim 1, further comprising a mandrel stop element coupled to the bottom end of the main body.",
    "5. The device of claim 1, further comprising a top catch body coupled to the top end of the main body.",
    "6. The device of claim 1, wherein the receiving body further comprises a knockout plug.",
    "7. A device, comprising: a bottom receiving body comprising a knockout plug; a first mandrel assembly comprising: a first main body having a top end and a bottom end, and the first main body is at least partially disposed within the bottom receiving body; a first sealing element disposed about the first main body; a first shear pin disposed within the bottom receiving body; and the device further comprises: a second mandrel assembly comprising: a second main body having a top end and a bottom end, the second main body partially disposed within the first main body; a second sealing element disposed about the second main body; and a second shear pin disposed within the first main body.",
    "8. The device of claim 7, wherein the first main body is substantially cylindrical and comprises a tapered section, and the second main body is substantially cylindrical and comprises a tapered section.",
    "9. The device of claim 7, wherein: the first shear pin is further disposed within a first shear sleeve, the first shear sleeve at least partially disposed within the bottom receiving body; and the second shear pin is further disposed within a second shear sleeve, the second shear sleeve at least partially disposed within the first main body.",
    "10. The device of claim 9, further comprising a third mandrel assembly having: a third main body comprising a top end and a bottom end, and the third main body is at least partially disposed within the second main body; a third sealing element disposed about the third main body; and a third shear pin disposed within second main body.",
    "11. The device of claim 7, further comprising: a first collar element disposed about the first main body between the first sealing element and the bottom receiving body; and a second collar element disposed about the second main body between the second sealing element and the first main body.",
    "12. The device of claim 7, further comprising at least one back-up ring that is in contact with the first or second sealing element.",
    "13. The device of claim 7, further comprising: a first mandrel stop element coupled to the bottom end of the first main body, and a second mandrel stop element coupled to the bottom end of the second main body.",
    "14. The device of claim 7, further comprising a top catch body coupled to the top end of the second main body.",
    "15. A method, comprising: selecting a first shear pin and a second shear pin according to a desired order of engagement of a first mandrel and a second mandrel; assembling a plug assembly comprising the first mandrel, the second mandrel and a bottom receiving body, the first mandrel comprises the first shear pin and a first sealing element, the first mandrel is at least partially disposed within the second mandrel, the second mandrel comprises the second shear pin and a second sealing element, the second mandrel is at least partially disposed within the bottom receiving body; deploying the plug assembly into a wellbore; applying pressure until a weaker shear pin of the first and second shear pins shears; and then applying additional pressure until a remaining shear pin of the first and second shear pins shears.",
    "16. The method of claim 15, wherein the deploying step is accomplished using slickline equipment.",
    "17. The method of claim 15, wherein the plug assembly further comprises a top catch body coupled to the first mandrel.",
    "18. The method of claim 17, further comprising: removing a knockout plug of the bottom receiving body; and removing the plug assembly from the wellbore using the top catch body."
  ],
  "cpc": [
    "E21B 33/13",
    "E21B 33/12",
    "E21B 33/1208"
  ],
  "assignees": [
    "LEVEL 3 SYSTEMS LLC"
  ],
  "filing_date": "2022-02-21",
  "publication_date": "2022-09-20",
  "grant_date": "2022-09-20",
  "priority_date": "2022-02-21",
  "application_number": "US-202217676377-A",
  "family_id": "83286381",
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}