A New Product
Patent
GISpribor-M recently began batch production of a well logging truck hoist with a new cable reel drive system.
The idea behind the innovation is the introduction of a differential gear drive and an auxiliary low-power (up to 3 kW) electric drive powered from an external 220 V single-phase mains supply or an autonomous generator into the transmission of a pulling-and-running mechanism operated by the truck chassis motor. Such a differential gear drive in combination with the frequency control of the auxiliary electric motor and the microprocessor controlling system considerably improves the basic characteristics of the motor hoist. In particular it widens the range of stable speeds of tool movement in the well during hoisting (10 to 8000 m/hour) and forced running-in (10 to 7000 m/hour).
The already completed and the ongoing field tests in Western Siberia of the engineering sample confirm the effectiveness of the new drive system. The system adds new possibilities to mechanical truck hoists which previously used a rather complicated and expensive power hydraulic drive or an electric drive system. The results of these tests and new design solutions based on them allow us to assert that the differential gear drive system can provide better performance than power hydraulic and electric drives as regards stability and absolute values of low speeds, and allows considerable reductions in the cost of the equipment.
The vital difference of the differential gear drive is that it ensures slow movement of the logging cable, not by reducing the motor speed but due to kinematic subtraction of the two relatively high speeds of movement of the transmission elements. One of these movements is provided by the chassis motor and the second is produced by the weight of the cable and the instruments in the well. The latter is controlled by a low-power auxiliary electric motor. Because the speeds of opposite rotation of the two transmission input elements are relatively high (about 200 rev./min.), they can be controlled with significantly higher stability compared to the low speeds of an electric or a hydraulic motor. Therefore, for the differential gear drive, even zero speed of the transmission output element demonstrates the same stability as other speeds. When a 220 V mains supply is unavailable the differential gear drive hoist can be operated as a regular mechanical drive hoist with a cable movement speed ranging from 400 to 8000 m/hour when pulling out and a free travel mode when running tools into the well.
Differential gear drive
The design of the differential gear drive allows it to be used with new machines and also for upgrading operating mechanical hoists by means of integration into the existing transmission.
Installation in such machines of an operating parameter measuring and registration system, an electrically driven cable layer (powered by the vehicle's 24V mains), and automation elements will bring mechanical truck hoists to a brand new level of efficiency.
