DEVICE FOR INSTRUMENT ROUND TRIP ON CABLE Russian patent published in 1994 - IPC

FIELD: geophysical investigations in wells. SUBSTANCE: device has lubricator 19 communicated by means of pipelines with hollow of air-tight body 10 having seal. Pipelines are made in form of telescopic lengths 21 and 24 whose length is equal to that of truck body and connected with their ends to spherical tight connections 22 and 23. Arranged in truck body is mechanism for execution of round trip, which includes drum 1, tractive rollers 8 and 9 located in hollow of housing 10, and reversing drive motors 11 and 32 with shaft passing through seal. Motor 32 is connected with drum 1. Stuffing box seal of housing 10 is made in form of three annular chambers 12-14 embracing run of cable 37 off drum 1. Chambers 12 and 13 are communicated through pressure duct 16 and discharge duct 17 with cooling unit 15, and chamber 14 is communicated with atmosphere. Hollow of housing 10 is communicated with pump 33 for receiving sealing fluid. Motor 11 rotates roller 9. As depth increases, rotation speed of motor 11 and consequently, of cable 37 rises. Cable motion can be braked means off drum 1. EFFECT: higher reliability of operation in wells with high well-head pressure. 3 cl, 3 dwg