Well tool

摘要

A ported sliding sleeve valve for use in a well tubing to provide a lateral flow path for transfer of fluids between the tubing and the annulus exterior thereof, the lateral ports of the device being initially closed by a port closure sleeve which is movable to port-opening position by increasing the annulus pressure to a level exceeding tubing pressure by a predetermined value, the port closure sleeve moving to fully open position upon being released and afterwards remaining in this position while the lateral ports of the device are thereafter opened and closed by shifting a built-in sliding sleeve valve through use of a shifting tool run and operated via wireline or pumpdown tools in a manner well known in the industry.