ABSTRACT
The main means of coal mine gas drainage and directional exploration and drainage is directional drilling. To ensure coal mine safety mining, the diameter of construction boreholes should be minimized. The existing directional exploration and drainage drilling equipment is equipped with Φ73 mm drill pipe and drilling measurement system, and the diameter of boreholes is more than Φ94-108 mm, which is difficult to meet the needs of field construction. In this paper, a new type of narrow-body ZDY4000LD (C) directional water detection rig is developed for small-diameter directional water detection and drainage and gas drainage boreholes. The targeted design is carried out in terms of its volume layout, torque, rotational speed, spindle inclination angle, feeding process, and pulling force, and the Φ63 screw motor is equipped. A small-diameter electromagnetic wave while drilling measurement system is developed, and a micro-power probe circuit, a small-diameter structure, a high-sensitivity orifice controller, a wavelet flameproof and intrinsically safe power supply are designed. The new directional exploration and drainage drilling equipment is tested in Shangwan Coal Mine. The drilling length is 248 m, and the equipment is reliable, which meets the practical application needs of the mine and ensures the safe and efficient mining of the coal mine.
