Valve assembly for the remote control of fluid flow having an automatic time delay

Abstract

Abstract ABSTRACT OF THE DISCLOSURE A downhole float valve is normally closed by a spring or other means of applying axial pressure until suf-ficient pressure of drilling fluid from the surface opens the valve. The valve stem includes a dashpot type housing secured thereto and moving within a fluid filled cylinder. When the valve opens, the movement is controlled by a one-way valve in the housing giving a relatively rapid opening. When pressure of the drilling fluid from the surface is re-moved, the pressure on the underside of the valve typically assisted by the spring, closes the valve. An adjustable bleed passage in the housing delays this closing for a pre-determined time thus allowing the pressure on the un-derside of the valve to balance with the pressure on the other side of the valve, but preventing an hydraulic lock or an hydraulic "stuck" situation from occurring.

Inventors

• 👤 Robert G. Reay
• 👤 Ronald Rachuk

Bibliographic Details