초록 ▼

A standing valve which may be retrievably mounted in a well production tubing and will allow the maximum possible fluid flow and also allow the valve to be easily drained and retrieved through the well production tubing. The seal between the standing valve and the bottom hole assembly is located at

A standing valve which may be retrievably mounted in a well production tubing and will allow the maximum possible fluid flow and also allow the valve to be easily drained and retrieved through the well production tubing. The seal between the standing valve and the bottom hole assembly is located at or below the level of the seat and fluid from the top of the valve into the well is drained through the seat.

대표청구항 ▼

In a standing valve to be retrievably mounted in a well production tubing which will allow the maximum possible fluid flow and also still allow the valve to be easily drained and retrieved through the well production tubing: (a) a valve body having a passage therethrough and at least one port extend

In a standing valve to be retrievably mounted in a well production tubing which will allow the maximum possible fluid flow and also still allow the valve to be easily drained and retrieved through the well production tubing: (a) a valve body having a passage therethrough and at least one port extending from the passage to the outside body; (b) sealing means on the outside of said body below said port for sealing engagement with said production tubing in the mounting position of said standing valve; (c) a seat in said passage of said valve body between said port and said sealing means; (d) a one-way valve associated with said seat and acting against downward fluid flow, said one-way valve comprising a stem and head, said head having a central aperture therethrough and the lower end of said stem being located in and in sealing engagement with said central aperture and being maintained therein by a break-away device to release when subjected to a predetermined force; and (e) a puller assembly engagable by a pulling tool and captively mounted in the upper portion of said valve body and engagable with said stem to apply a pulling force thereto and pull said stem upwardly; whereby if a pulling force applied to said puller assembly, and thus to said stem, does not retrieve said standing valve, then said break-away device will release and said stem will disengage and expose said central aperture in said head, permitting continued draining of well fluid above said standing valve, and additional force on said puller assembly will remove said standing valve because of the captive mounting of said puller assembly in said valve body.