Retrieval tool for back pressure valve and tree test plug

摘要

A retrieval tool for retrieving a back pressure valve and tree test plug (generally, a check valve) has a spear formed as a solid ring at the bottom with free fingers extending upward. The fingers are resilient and have protrusions adapted to engage a retrieval groove in the check valve. A wedge ring is provided on the tool body to positively lock the fingers in radially outward engagement with the retrieval groove. The wedge ring is fixed to the body by a shear pin so that upon a predetermined axial force the pin shears and releases the wedge ring allowing withdrawal of the tool assembly, if the check valve is stuck in a tubing hanger or coupling.