METHOD AND DEVICE FOR LIFTING AND LOWERING CORE RECEIVING TUBES Russian patent published in 2017 - IPC E21B25/00 E21B19/00 

FIELD: oil and gas industry.

SUBSTANCE: method for extracting and lowering core receiving tubes includes lifting with a winch device for lowering and extracting the core receiving tubes onto the rotor table, mounting the upper part of the core receiving tube cap and lifting it to extract completely the upper section of core receiving assembly, separating the upper and lower sections of the core receiving tube by a device for cutting and holding the core, securing its lower part on the device for extracting and lowering the core receiving tubes by a lower mechanical grip, lowering the device with core receiving tube and the core attached thereto to the receiving bridges and detaching the device for cutting and holding the core and the cap of the core receiving tube. Prior complete extraction of the core receiving tube from the core receiving assembly, the cap is placed in the upper mechanical grip and a turnable plate is closed with a locking pin of the upper mechanical grip. Separation of the upper and lower sections of the core receiving tube is performed by the device for cutting and holding the core after fixing its lower part on the device for extracting and lowering the core receiving tubes by the lower mechanical grip.

EFFECT: simplified extraction of the core receiving pipe with the core from the core receiving assembly and lowering to receiving bridges without bending the core tube and destructing the core, increased safety.

2 cl, 5 dwg