Wireline retrievable injection valve assembly with a variable orifice

摘要

A wireline retrievable injection valve for an oil or gas well has an internal valve that is initially moved to open a flapper safety valve and also opens to allow fluid flow through the valve. The internal valve includes a sleeve that opens the flapper safety valve and shields the flapper safety valve from fluid. In this manner the flapper valve is protected from being caused to “flutter” or “chatter” due to pressure variations in the fluid flow, thereby damaging the seat.

主权项

1. A wireline retrievable injection valve comprising:
a valve body having an inlet and outlet; a flapper valve element pivotably mounted in a lower portion of the valve body; and an axially movable valve assembly positioned within the valve body including a second valve and a sleeve, the sleeve adapted to move the flapper valve element to an open position when the valve assembly moves in a downwardly direction in response to fluid flow through the valve, said second valve being biased to a fully closed position in the absence of fluid flow, wherein movement of the sleeve is resisted by a spring and movement of the second valve is resisted by a second spring, the strengths of the springs being such that upon initial flow the sleeve will move to open the flapper valve element while the second valve remain closed.