Abstract: An improved sealing device, which when positioned inside a flow conductor and operated, compresses and expands an improved resilient element into fluid sealing engagement between the sealing device and the inside of the flow conductor. The sealing device is provided with centralizing lugs, which automatically extend to centralize the improved resilient element on sealing engagement in the flow conductor, assuring an increased pressure resistant seal. The improved resilient element has end supports including a reinforced coil spring in each end to prevent pressure extrusion of the resilient material and when sealingly engaged, functions as a cup type sealing element. Two forms of wire reinforcement for the coil spring are disclosed, both of which provide further increased resistance to pressure sealed. The improved sealing element may be provided with an outer layer of softer resilient material to assure sealing in rough flow conductors.

Abstract: Downhole apparatus for converting conventional petroleum wells to gas lift or chemical injection operation by perforating the well tubing at the desired depth and thereafter installing a packoff anchor within the well tubing, without disturbing the setting thereof, to bridge the perforation, the packoff anchor having an elongate tubular body with a lateral flow port in its wall, seals above and below the flow port for sealing with the well tubing above and below the perforation, and a receptacle for receiving a flow control device, such as a gas lift valve or injection valve for controlling flow through the lateral port. Fluids, such as lift gas or treating fluids injected into the annulus at the surface enter the flow stream inside the well tubing through the perforation and lateral flow port but under control of the flow control device. Preferably this elongate tubular body is a side pocket mandrel, and that preferably of the orienting type.