Wells – Processes – Cleaning or unloading well
Patent
1994-09-01
1995-08-29
Dang, Hoang C.
Wells
Processes
Cleaning or unloading well
137102, 166321, 166325, 166374, E21B 3410, E21B 3700
Patent
active
054452244
ABSTRACT:
The present invention provides a method and apparatus for controlling the flow of fluids being injected into an oil or gas well through a tubing string, including a generally cylindrical hollow body for connection to the tubing string for receiving and selectively conveying fluids received from the tubing string therethrough, the body having an open top end and an open bottom end, the body having a flow passage therein for conveying fluids from the top end of the hollow body to the bottom end of the hollow body, the top end being provided with a device for connecting the top end to the tubing string, the bottom end being provided with a device for connecting the bottom end to a tool for injecting the fluids into a well, a movable piston slidably received in the body, the movable piston being movable upward against a top seal to stop the flow of fluids through the flow passage and being movable downward against a stop to enable fluids to flow through the flow passage from the top end to the bottom end in response to sufficient hydraulic pressure being applied to the fluids in the tubing string, a biasing device contained inside the body for biasing the piston toward the top end of the body to stop the conveyance of fluids through the flow passage, and a port located beneath the piston for conveying fluids contained in the body beneath the piston to the exterior of the body when the piston is forced against the top seal, the port being closed by the piston when the piston is forced downward against the stop.
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Dang Hoang C.
Ray David L.
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