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The core technology of the electronic control system of our newly developed XY-44B intelligent electric-control drilling rig is direct torque control (DTC). The product is developed on the basis of Eurotherm system with the main control unit being Eurotherm 590 system. The hydraulic pressure stand is composed of hydraulic oil tank, electric motor and electronically controlled hydraulic directional valve. The main outstanding characteristics of the electronic control system are displayed as follows.
The system achieves the stepless speed changing of the spindle by saving the trouble of mechanical gear shift. The direct torque control enables the intelligent electric-control drilling rig to have different torques under the same speed range. In accordance with the geological conditions and the bearing capacity of the drilling rod, we can make an upper control limit to the torque of the motor. During the test process, when we apply the external force suddenly to the system, the motor would shut down automatically.
During the drilling process, the impact originating from the incomplete stratum would be fed back to the system, and the system controls the motor to make the real-time adjustment to the torque delivered by the drilling rod.
The spindle and winch of the product utilize the remote control, realizing wellhead unmanned operation for normal drilling and pulling out of the drilling tools. Due to the application of the new digital electronic control system and direct torque control, through the control to the DC speed regulating motor, we can actualize the free selection and change of the spindle speed and torque within certain range. During the drilling process, all the drilling parameters, including spindle speed, torque, the pressure of the hydraulic pressure stand, and the mud pump pressure, are displayed on the screen intuitively. By using the full digital electronic control system, we can set the limit torque value of the drilling rod in line with its torsional strength. The winch of the intelligent electric-control drilling rig is driven by the AC inverter motor. The hydraulic system of the product exploits the hydraulic pressure stand to achieve oil supply. The operational buttons and handles of the machine are concentrated on the control console. The hydraulic chuck of the product works with belleville spring clamping, hydraulic cylinder loosening, and three-slip automatic centering. With low center of gravity and long backward travel, the product can be fixed firmly and show good high speed drilling stability.

One is for displaying the operating parameters of the machine and adjusting each parameter. Technically, our intelligent electronic control system is the simplified version of the oil top drive drilling system. The intelligent electric-control drilling rig can carry out the parameter optimization to implement the drilling, having significance for alleviating the drilling rod fatigue and saving the energy. Featuring simple oil pipeline installation, convenient use, and low power consumption, it is guaranteed with low oil temperature and stable working performance.
During the normal drilling process, the operator can stay far away from the intelligent electric-control drilling rig. The circuit and hydraulic oil pipeline use the rapid cartridge connection with good dismountability.
Taking usage of double cylinders hydraulic feeding, it has strong technological adaptability, and is especially fit for large diameter drilling rod wireline coring (upper part coring) drilling to enhance the drilling efficiency. The operator controls the buttons on the control console to control the electronically controlled hydraulic directional valve to actualize controlling the drilling machine. The core technology provides the user with great convenience in the aspect of drilling parameter optimization. On the control console, there is also another screen which can be connected to multiple cameras for additional monitoring such as the parts that the top of the drilling tower is difficult to access, thus monitoring the working status of the entire jobsite in a more comprehensive way. Owing to the stepless speed changing for the lifting speed, the construction efficiency is raised, and the occurrence of the personal injury accident can be avoided during the process of putting the drilling tool into the well or pulling the drilling tool out of the well.
Making a comparison with the case of using the traditional drilling machine, the personal safety of the worker can be guaranteed enormously by using our product. When the torque that the drilling rod suffers gets to 800N.m, the system would raise the alarm to remind the operator that there is the abnormal condition in the well. Along with the increase of the drilling depth, the time of the soft start can be prolonged. In contrast with the structure of the ordinary motor or diesel engine adopting clutch, the soft start can mitigate the impact of the power start to the internal structure of the product, and reduce the drilling rod fatigue degree to the utmost extent.

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