초록 ▼

A blowout preventer assembly 10 includes opposed rams 12, 14, each including a rubber or elastomer sealing assembly 16, 18, with a plurality of inserts 20 forming an array 22 of metal inserts within each sealing assembly. Each insert has an upper body 24, a lower body 26, and a rib 50. Each upper an

A blowout preventer assembly 10 includes opposed rams 12, 14, each including a rubber or elastomer sealing assembly 16, 18, with a plurality of inserts 20 forming an array 22 of metal inserts within each sealing assembly. Each insert has an upper body 24, a lower body 26, and a rib 50. Each upper and lower body includes a trailing face 36, a radially outward opposite face 38 and a leading face 40. An antiextrusion ledge 46 minimizes the extrusion gap between the OD of a tubular in the BOP and the leading face of the metal inserts in the array.

대표청구항 ▼

1. A blowout preventor for sealing engagement with a tubular within a wellbore, comprising:a blowout preventor body with a central bore; a pair of opposing ram block assemblies, each ram block assembly including a ram block at an inner end of a cylinder rod; a seal assembly carried by each ram block

1. A blowout preventor for sealing engagement with a tubular within a wellbore, comprising:a blowout preventor body with a central bore; a pair of opposing ram block assemblies, each ram block assembly including a ram block at an inner end of a cylinder rod; a seal assembly carried by each ram block and radially moveable for sealing engagement and disengagement with the tubular, each seal assembly including a resilient seal for sealingly engaging the tubular and a plurality of inserts at least substantially embedded within the resilient seal for preventing extrusion of the resilient seal; each insert including a generally triangular shaped upper body, a generally triangular shaped lower body, and a rib fixedly interconnecting the upper body and the lower body, each upper body and lower body having a leading face, a trailing face, and a radially outward opposite face; a ledge in the upper body extending from one of the leading face and the trailing face in a direction away from the rib: a recess in the upper body of an adjacent insert extending toward the rib of the adjacent insert to receive the ledge and circumferentially interconnect the inserts; an antiextrusion ledge extending from the ledge in the upper body; and an antiextrusion slot in the trailing face of the upper body for receiving the antiextrusion ledge of an adjacent insert. 2. A blowout preventor as defined in claim 1, wherein the plurality of inserts move in an iris pattern to alter a bore diameter of the blowout preventor.3. A blowout preventor as defined in claim 1, wherein the lower body include another circumferentially extending ledge extending from one of the leading face and the trailing face, and a recess in the other of the leading face and the trailing face for receiving an adjacent ledge.4. A blowout preventor as defined in claim 3, wherein each of the ledge in the upper body and the another ledge in the lower body extend from the trailing face.5. A blowout preventor as defined in claim 1, wherein the antiextrusion ledge of each insert includes a curved ramp portion commencing with a starting point spaced radially outward from a radially innermost portion of the leading face.6. A blowout preventor as defined in claim 5, wherein a radial spacing between an imaginary apex of the upper body and the starting point of each curved ramp portion is at least 5% of a nominal diameter of the blowout preventor.7. A blowout preventor as defined in claim 5, wherein the antiextrusion ledge of each insert includes face surface spaced radially outward from the curved ramp portion and substantially parallel to the leading face of the upper body.8. A blowout preventor as defined in claim 1, wherein the rib of each insert includes a front surface spaced radially outward of a radially innermost surface of the insert and a rear surface spaced radially inward of a radially outermost surface of the insert.9. A blowout preventor as defined in claim 1, further comprising:the resilient seal having a generally semi-circular portion and a pair of opposing leg members each extending radially outward from each end of the semi-circular portion; and additional metal inserts positioned within each of the leg members. 10. A blowout preventor as defined in claim 1, wherein the antiextrusion ledge of each insert commences with a starting point spaced radially inward of a radially innermost portion of the ledge in the upper body.11. A blowout preventor as defined in claim 1, wherein the antiextrusion ledge is spaced in a direction along the central bore between the ledge in the upper body and the rib.12. A blowout preventor for sealing engagement with a tubular within a wellbore, comprising:a blowout preventor body with a central bore; a pair of opposing ram block assemblies, each ram block assembly including a ram block at an inner end of a cylinder rod; a seal assembly carried by each ram block and radially moveable for sealing engagement and disengagement with the tubular, each seal assembly including a resilient seal for sealingly engaging the tubular and a plurality of inserts at least substantially embedded within the resilient seal for preventing extrusion of the resilient seal, the plurality of inserts arranged to move in an iris pattern to alter a bore diameter of the blowout preventor; each insert including a generally triangular shaped upper body, a generally triangular shaped lower body, and a rib fixedly interconnecting the upper body and the lower body, each upper body and lower body having a leading face, a trailing face, and a radially outward opposite face; each of the upper body and the lower body including a circumferentially extending ledge extending from one of the leading face and the trailing face, and a recess in the other of the leading face and the trailing face for receiving an adjacent ledge, each leading face being centrally tangent to the bore at the point of intersecting the bore; the plurality of inserts move in an iris pattern to alter a bore diameter of the blowout preventor; an antiextrusion ledge extending from the circumferentially extending ledge of the upper body; and an antiextrusion slot in the trailing face of the upper body for receiving the antiextrusion ledge of an adjacent insert. 13. A blowout preventor as defined in claim 12, wherein the rib of each insert includes a front surface spaced radially outward of a radially innermost surface of the insert and a rear surface spaced radially inward of a radially outermost surface of the insert.14. A blowout preventor as defined in claim 12, wherein the antiextrusion ledge of each insert includes a curved ramp portion commencing with a starting point spaced radially outward from a radially innermost portion of the leading face.15. A blowout Preventor as defined in claim 12, wherein each of the ledge in the upper body and the lower body extend from the trailing face.16. A blowout preventor as defined in claim 12, wherein the antiextrusion ledge of each insert commences with a starting point spaced radially inward of a radially innermost portion of the ledge in the upper body.17. A blowout preventor for sealing engagement with a tubular within a wellbore, comprising:a blowout preventor body with a central bore; a pair of opposing ram block assemblies, each ram block assembly including a ram block at an inner end of a cylinder rod; a seal assembly carried by each ram block and radially moveable for sealing engagement and disengagement with the tubular, each seal assembly including a resilient seal for sealingly engaging the tubular and a plurality of inserts at least substantially embedded within the resilient seal for preventing extrusion of the resilient seal, the plurality of inserts arranged to move in an iris pattern to alter a bore diameter of the blowout preventor; each insert including a generally triangular shaped upper body, a generally triangular shaped lower body, and a rib fixedly interconnecting the upper body and the lower body, each upper body and lower body having a leading face, a trailing face, and a radially outward opposite face; an antiextrusion ledge extending from the leading face of the upper body, wherein the antiextrusion ledge of each insert includes a curved ramp portion commencing with a starting point spaced radially outward from a radially innermost portion of the leading face; and an antiextrusion slot in the trailing face of the upper body for receiving the antiextrusion ledge of an adjacent insert. 18. A blowout preventor as defined in claim 17, wherein the rib of each insert includes a front surface spaced radially outward of a radially innermost surface of the insert and a rear surface spaced radially inward of a radially outermost surface of the insert.19. A blowout preventor as defined in claim 17, wherein a radial opening between an imaginary apex at the upper body and the starting point of each curved ramp portion is at least 5% of a nominal diameter of the blowout preventor.20. A blowout preventor as defined in claim 17, wherein the antiextrusion ledge of each insert commences with a starting point spaced radially inward of a radially innermost portion of the ledge in the upper body.