Injection control device for subterranean well conduit

Details Injection control device for subterranean well conduit Injection control device for subterranean well conduit

E - Fixed Constructions

21

B

166/41

E21B 34/12 (2006.01)

Patent

CA 1269040

TITLE: INJECTION CONTROL DEVICE FOR SUBTERRANEAN WELL CONDUIT ABSTRACT OF THE INVENTION A downhole injection valve for selectively opening and closing the bore of a tubing string to permit the passage of chemical treatment fluid at a preselected flow rate to a downhole tool comprises a first annular valve element mounted in a valve housing which is connected in a tubing string above the downhole tool. A slip joint is connected between the valve housing and the downhole tool to permit relative upward and downward movement of the valve housing with respect to the tool. A second annular valve element is disposed in surrounding relationship to a support rod which is inserted in the tubing string and supported at its bottom end by the downhole tool. Upward movement of the tubing string effects contact of the first and second annular valve elements to close all fluid flow through the bore of the tubing string. Conversely, downward movement of the tubing string will effect axial separation of the valve elements to permit fluid flow through the tubing string to the downhole tool. An orifice ring secured to the support rod and the bore of the valve housing is contoured to provide a preselected annular orifice in the flow path of the fluid to the downhole tool, thus regulating the rate of supply of such fluid.

528840

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