Method and apparatus for annulus pressure responsive...

Details Method and apparatus for annulus pressure responsive... Method and apparatus for annulus pressure responsive...

E - Fixed Constructions

21

B

166/41

E21B 49/00 (2006.01) E21B 34/10 (2006.01) E21B 49/08 (2006.01)

Patent

CA 1036488

ABSTRACT A releasably locked closed circulation valve is introduced into a well bore as part of a drill string. The annulus between the drill string and the well bore, or casing affixed to the well bore, is sealed. Pres- sure is applied to the annulus and the valve unlocks and opens once the annulus pressure reaches a certain level to allow circulation between the annulus and the interior of the drill string. An optional locking device preferrably locks the opened valve in the open position. A second embodiment includes a tester valve simultaneously operable with the circulation valve.

243041

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