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.

Abstract: A running tool for installing a wireline retrievable safety valve in a landing nipple of a well tubing string including a body connectible with a wireline tool string, a locking assembly for releasably locking the body with a well safety valve, a core connected with the body and connectible by a shear pin with a well safety valve, and a spring isolator tube assembly connected with the core and engageable with a spring operator tube in a safety valve to hold the valve spring compressed during valve installations. The isolator tube assembly prevents down forces on the running tool from direct delivery to the spring operator tube during valve installation.

Abstract: A differential pressure operated subsurface safety valve (20). A latch mechanism, having ball detents (63), holds the safety valve (20) open until the difference in pressure between fluid in chamber (40) within the safety valve (20) and fluid flowing through the safety valve (20) exceeds a preselected value. The difference in pressure acts upon a piston (37) which is attached to an actuator sleeve (31) causing the actuator sleeve (31) to shift the safety valve (20) from its open to its closed position. The chamber (40) is charged by and equalized with fluid pressure around the exterior of the safety valve (20).