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US 10,294,755 B2Granted
Dual barrier injection valve with a variable orifice
AssigneeTejas Research & Engineering, LLC
InventorsJason C. Mailand, Thomas G. Hill, Jr.
Life of this patent
Estimating the term…
Abstract
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, which may damage the seat.
Claims10
An injection valve comprising:
- a) a valve body having an inlet and outlet;
- b) a flapper valve element pivotally mounted in a lower portion of the valve body;
- c) an axially movable variable orifice insert positioned within the valve body including a second valve, a middle sleeve and an a outer sleeve, and a pair of magnets of opposite polarity, one of said magnets being fixed on the middle sleeve and the other of said magnets being movable with the outer sleeve, and a spring surrounding the middle sleeve and positioned between the movable magnet and an abutment.
Dependencies are inferred from the claim text.