Abstract: A running-retrieving tool for use in oilfield operations comprises a first section having a bonnet and a split retainer, the first section having a cavity with an inner diameter adapted to allow the insertion therethrough of a second section and wherein the first section is adapted to be secured to a tool. The second section has an elongated body with an external diameter smaller than the internal diameter of the first section. The second section has a track, an entry channel, and a release channel. The second section is adapted to be mounted onto a drillstring and is releasably inserted inside the cavity of the first section through the insertion of J-pins inside the track.