Abstract: A gas lift mandrel is provided for installation in a string of production tubing extending into a well casing for gas energized production of petroleum products. The mandrel incorporates a tubular body having offset extremities for connection to tubing sections and defining a well aperture in its side wall. An inner tubular sleeve is located within the tubular body and defines an elongated opening within which is received a valve receptacle and valve guard in coextensive relation. The valve receptacle incorporates an external weld boss which is located within the weld aperture of the body and connected to the body by welding. The inner sleeve varies in thickness from a maximum thickness on the side of the aperture to a minimum thickness on the side opposite the weld aperture.

Abstract: A releasable, retrievable latch includes a mandrel having one end threaded externally and an internally threaded socket formed on the other end thereof. A body has one end with a configuration for engagement with a running tool and the other end of the body is provided with a longitudinal bore therein, the innermost end of which is threaded whereby the body may be threadedly engaged with the external threaded end of the mandrel. The bore adjacent the other end of the mandrel has a plurality of longitudinally extending circumferentially spaced slots to form a plurality of flexible longitudinally extending portions so that such portions will flex when engaged with an enlargement as the latch is moved into seated position in a receiving section of a side pocket mandrel. The threaded socket on the end of the mandrel engages with a member which is to be positioned in the receiving section of the side pocket mandrel.