MULTI-PURPOSE SELF-MOVING DRILLING ASSEMBLY "KROT" Russian patent published in 2013 - IPC E21B7/00 E21B4/18 E21B23/00 

FIELD: oil and gas industry.

SUBSTANCE: multi-purpose self-moving drilling assembly consists of housing that has hidden projecting anchor movement-locking devices, in which there located is a motor-reducer with hollow shaft, main drilling tool rigidly connected at the base and acting as well opener, extendable hollow shaft mounted through it that has hidden projecting anchor movement-locking devices, spudding drilling tool rigidly connected at the end.

EFFECT: drilling of wells of different functions in hard-to-reach areas.

1 dwg