Tubing drain valve

Details Tubing drain valve Tubing drain valve

E - Fixed Constructions

21

B

166/41

E21B 34/12 (2006.01) E21B 34/06 (2006.01)

Patent

CA 1233744

-24- Abstract of the Disclosure The present invention discloses a tubing drain valve suitable for use in a borehole and a method for operating the disclosed valve. This device is particularly useful in a production pipe string where it provides a convenient apparatus and method for draining production fluid from the string in order to facilitate a variety of activities. More parti- cularly, the present invention relates to a tubing drain valve actuated to its open position by a force developed across the working surfaces of a movable piston by the pressure in the interior of the production string and actuated to its closed position by a mechanical device. Preferably, the tubing drain valve of the present invention further comprises structure to bias the valve to its closed position and structure to bias the valve in its open position. The valve of the present invention is actuated by overcoming the appropriate biassing forces.

475443

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