Patent ID: 7640974

Claim:
Spool apparatus for use in an underground well having casing, comprising a) a body sized for longitudinal travel in the well casing, b) said body defining a well fluid flow duct having a downward facing entrance and a sidewardly facing exit, c) there being a lower connection for coupling the body to lower well pipe to pass fluid into the body via said entrance, and an upper connection for coupling the body to upper carrier structure used for raising and lowering the body in the well casing, d) and there being means to latch connect the body to the well casing in a position for well fluid delivery from the body via said exit, e) and wherein said latch means includes a snap ring positioned to disconnect the body from the well casing in response to upward displacement of said carrier structure, the snap ring being expansible laterally in a body groove and into a position to land on an upward facing surface on a sub, the ring defining a cam surface engagable with a locking shoulder to deflect the ring radially for upward travel in the casing.