Otis Engineering Corporation

Robert B Wheeler

Dhirajlal C Patel

A method for protecting a well formation during gravel packing in which a back pressure valve is held off of its seat while gravel is being placed in the well, is automatically closed as the wash pipe is removed from the screen and in which the valve is returned to open position by a force exerted from above, either hydraulic or mechanical. A valve is held open by a prop-out which is removable to permit the valve to swing to closed position and thereafter the valve is again opened in response to mechanical or hydraulic force from above.

Growing community of inventors

Carrollton, TX, United States of America

Robert B Wheeler