Blowout preventer

Details Blowout preventer Blowout preventer

E - Fixed Constructions

21

B

166/50

E21B 43/12 (2006.01) E21B 33/06 (2006.01) E21B 33/08 (2006.01) E21B 34/16 (2006.01)

Patent

CA 2040013

ABSTRACT OF THE DISCLOSURE A blowout preventer for use on wells and especially adapted to use on a pumping well during a steam flood operation including an upper housing having oppositely disposed rams for extension and retraction between the sealing and non-sealing with a longitudinal member through the blowout preventer into a well, such a polished rod of a pump, a lower housing connected with the upper housing, and a heat responsive seal assembly in the lower housing for sealing with the polished rod during steam flooding, the heat responsive seal assembly including an elastomer seal plug designed to swell to form a seal with the polished rod during steam flooding and including means to compress the seal plug after steam flooding to return the plug to an original non- sealing volume and size below the steam flooding temperature. 24

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