초록 ▼

The present invention relates to a downhole plug with an expandable elastomeric packer (1) having two ends, surrounding a main section (25). The intended application of the downhole plug is for sealing wellbores and tubulars (4). At least one expansion ring (13) adjoins at least one of said two ends

The present invention relates to a downhole plug with an expandable elastomeric packer (1) having two ends, surrounding a main section (25). The intended application of the downhole plug is for sealing wellbores and tubulars (4). At least one expansion ring (13) adjoins at least one of said two ends of the elastomeric packer (1), and at least one support ring (15) applies an axial force (16) in a longitudinal direction of the downhole plug. At least one of said two ends of the elastomeric packer (1) is made with a tapered surface. The at least one expansion ring (13) is made with a tapered surface configured in such a manner that the application of the axial force (16) in a longitudinal direction of the downhole plug leads to the simultaneous expansion of the elastomeric packer (1) and the at least one expansion ring (13).

대표청구항 ▼

1. A downhole plug with an expandable elastomeric packer (1) having two ends, extending around a main section (25), for use in sealing wellbores and tubulars (4), characterized by:at least one expansion ring (13) adjoining at least one of said two ends of the elastomeric packer (1) provided with a s

1. A downhole plug with an expandable elastomeric packer (1) having two ends, extending around a main section (25), for use in sealing wellbores and tubulars (4), characterized by:at least one expansion ring (13) adjoining at least one of said two ends of the elastomeric packer (1) provided with a split groove (17) that can be opened to allow the ring (13) to expand in a radial direction, wherein at the end of the split groove, there is a frangible piece (18) including a small portion of material keeping expansion rings (13) together during assembly and until an axial force (16) is applied, wherein said split groove (17) is slanted at the point at which the gap opens;at least one guide ring (14) having tapered surfaces conducive to the expansion of the elastomeric packer (1) and the at least one expansion ring (13);at least one support ring (15) for exerting an axial force (16) in a longitudinal direction of the downhole plug;at least one of said two ends of the elastomeric packer (1) being provided with a tapered surface; andwherein the at least one expansion ring (13) being provided with a tapered surface configured in such a manner that the application of the axial force (16) in the longitudinal direction of the downhole plug results in the simultaneous expansion of the elastomeric packer (1) and the at least one expansion ring (13). 2. The downhole plug of claim 1, wherein the elastomeric packer (1) is composed by two annular outer elements (12) and an annular intermediate element (11), with each of the two outer elements (12) being expanded through an abutment against a sloping bevel or angular face (22) towards the intermediate element (11). 3. The downhole plug of claim 2, further comprising one expansion ring (13) and one support ring (14) at each end of the elastomeric packer (1). 4. The downhole plug of claim 3, further comprising a ratchet section having a sleeve so that axial movement of the sleeve exert an axial force on the support ring (15), the ratchet section comprising elements locking the sleeve against movement in a direction away from the support ring and allowing movement of the sleeve in a direction towards the support ring (15). 5. The downhole plug of claim 4, wherein the ratchet section includes wedges (32) with ratchet teeth (33), a bow spring (34), a cover (39), and wherein the main section (25) includes ratchet teeth for engaging the ratchet teeth (33) of the wedges (32). 6. The downhole plug of claim 4, further comprising a spring package (2) for keeping the at least one expansion ring (13) and the elastomeric packer (1) tensioned. 7. The downhole plug of claim 2, further comprising a ratchet section having a sleeve so that axial movement of the sleeve exert an axial force on the support ring (15), the ratchet section comprising elements locking the sleeve against movement in a direction away from the support ring and allowing movement of the sleeve in a direction towards the support ring (15). 8. The downhole plug of claim 7, wherein the ratchet section includes wedges (32) with ratchet teeth (33), a bow spring (34), a cover (39), and wherein the main section (25) includes ratchet teeth for engaging the ratchet teeth (33) of the wedges (32). 9. The downhole plug of claim 7, further comprising a spring package (2) for keeping the at least one expansion ring (13) and the elastomeric packer (1) tensioned. 10. The downhole plug of claim 1, further comprising one expansion ring (13) and one support ring (14) at each end of the elastomeric packer (1). 11. The downhole plug of claim 10, further comprising a ratchet section having a sleeve so that axial movement of the sleeve exert an axial force on the support ring (15), the ratchet section comprising elements locking the sleeve against movement in a direction away from the support ring and allowing movement of the sleeve in a direction towards the support ring (15). 12. The downhole plug of claim 11, wherein the ratchet section includes wedges (32) with ratchet teeth (33), a bow spring (34), a cover (39), and wherein the main section (25) includes ratchet teeth for engaging the ratchet teeth (33) of the wedges (32). 13. The downhole plug of claim 11, further comprising a spring package (2) for keeping the at least one expansion ring (13) and the elastomeric packer (1) tensioned. 14. The downhole plug of claim 1, further comprising a ratchet section having a sleeve so that axial movement of the sleeve exert an axial force on the support ring (15), the ratchet section comprising elements locking the sleeve against movement in a direction away from the support ring and allowing movement of the sleeve in a direction towards the support ring (15). 15. The downhole plug of claim 14, wherein the ratchet section includes wedges (32) with ratchet teeth (33), a bow spring (34), a cover (39), and wherein the main section (25) includes ratchet teeth for engaging the ratchet teeth (33) of the wedges (32). 16. The downhole plug of claim 15, further comprising a spring package (2) for keeping the at least one expansion ring (13) and the elastomeric packer (1) tensioned. 17. The downhole plug of claim 14, further comprising a spring package (2) for keeping the at least one expansion ring (13) and the elastomeric packer (1) tensioned. 18. The downhole plug of claim 1, further comprising an anchoring section (3) for anchoring the downhole plug in wellbores or tubulars (4), comprising at least one anchor (31) provided with teeth able to grip and hold on to a wall (21) of the wellbore or tubular (4). 19. The downhole plug of claim 1, further comprising that an annular fitting (9), a sleeve (39), the anchor (31), and at least one of spring packages (2) are slideably arranged on a main section (25) so that the application of an axial force on a shoulder (7) of the annular fitting (9) simultaneously activates the anchor and expands the elastomeric packer (1) and the at least one expansion ring (13). 20. Expansion ring (13) adapted to be located at the end of an elastomeric packer (1) on a well plug and to prevent extrusion of the elastomeric packer (1) when an axial load is applied to the packer, wherein said expansion ring (13) is provided with a split groove (17) that can be opened to allow the ring (13) to expand in a radial direction, wherein at the end of the split groove, there is a frangible piece (18) including a small portion of material keeping expansion rings (13) together during assembly and until an axial force (16) is applied, wherein said split groove (17) is slanted at the point at which the gap opens.