GISpribor-М Offers a Logging Truck Hoist With a New Cable Drum Gear System

Breakthroughs of this technology include a differential gear and ancillary low-power electric actuator (up to 3 kW) fed from an external mono-phase network (220 V) or isolated generator, which are introduced into the mechanical transmission system of the round-trip equipment of the hoist chassis motor. This gear, combined with variable frequency control of the ancillary electric motor and microprocessor control system, significantly improves the basic performance of the mechanical hoist. In particular, it widens the range of stabilized speeds of instruments traveling in the well during lifting (10 to 8,000 m/h) and forced running (10 to 7,000 m/h).

Preproduction field testing conducted in West Siberia, and still in progress, proves the efficiency of the new drive system that enables the mechanical logging truck hoist to perform in the place of complicated and expensive hydraulic or electric actuator systems. The field test results and the ensuing design solutions confirm that the differential gear system can replace hydraulic and electric actuators in terms of stability and low speed absolute values, as well as reduce production cost.

An outstanding feature of the differential gear is that it achieves a low logging-cable speed not by reducing the motor speed to a minimum, but by traveltime subtraction of two relatively high speeds of moving transmission parts. The movement is ensured both by the chassis motor and by the weight of the cable and instruments downhole controlled by an ancillary low-power motor. Since contra-rotating speeds of the two input links of the transmission are rather high (about 200 rpm), their control stability is significantly greater than under the low speeds of hydraulic or electric motors. Therefore, for the differential gear, even zero speed of the output transmission link does not differ from other speed values in terms of stability. If 220 V power is unavailable, the differential gear hoist can operate as a conventional mechanical drive hoist with a cable travel speed between 400 and 8,000 m/h while lifting and with a free travel mode while running instruments downhole.

The differential gear was developed both for use in new equipment and for modifying existing mechanical hoists by incorporation into the transmission.
The additional outfitting of an operating parameters measurement and registration system, an electrically actuated cable-layer fed from a vehicle power system (24 V), and automation equipment will significantly improve mechanical logging truck hoists.

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