DEVICE FOR DRILLING BORE-HOLES BY PLANETARY DRILL BIT METHOD Russian patent published in 1999 - IPC

FIELD: bore-hole drilling technology. SUBSTANCE: method can be used for drilling holes for oil, gas, water, and for other purposes. Device has surface drive, drilling string, bottom-hole motor with built-in transmission which is enclosed in splittable housing connected with body of bottom-hole motor. Transmission has drive shaft which is kinematically connected in upper part with output shaft of bottom-hole motor, and in lower part it is connected with central hollow pinion shaft adapted for engagement with drive hollow pinion shafts which are connected with drive hollow spindles which carry drill bits. Installed in upper part of transmission housing is oil lubricator connected through passages with oil-filled space of transmission housing. Aforesaid embodiment of device improves it operational reliability. EFFECT: higher efficiency. 3 dwg