Method and device for controlling drilling inclination angle in underground coal mine composite drilling

Abstract

The invention discloses a method and a device for controlling a drilling inclination angle in underground coal mine composite drilling. The method comprises the following steps that S1, the rotating speed and the drilling speed of a drill rod are obtained, and that the current working state needs to be subjected to an inclination angle increasing drilling procedure, an inclination angle decreasing drilling procedure or an inclination angle stabilizing drilling procedure according to the drilling track requirement is judged; and S2, the rotating speed and the drilling speed of the drill rod are controlled to be matched with the inclination angle increasing drilling procedure, the inclination angle decreasing drilling procedure or the inclination angle stabilizing drilling procedure, when the inclination angle increasing drilling procedure is conducted, at least the drill rod is made to have the angle change of being upwards away from the working face by 0.15 degree / m, when the inclination angle decreasing drilling procedure is conducted, at least the drill rod is made to have the angle change of being downwards away from the working face by 0.15 degree / m, and when the inclination angle stabilizing drilling procedure is conducted, at most the drill rod is made to have the angle change of being + / -0.05 degree / m relative to the working face. According to the method and the device for controlling the drilling inclination angle in underground coal mine composite drilling, the drilling track inclination angle can be controlled by controlling composite drilling technological parameters, and the method and device have important significance in achieving deep hole and efficient drilling.

Description

technical field [0001] The invention relates to the field of directional drilling in underground coal mines, in particular to a method and device for controlling the inclination angle of drilling holes in composite drilling in underground coal mines. Background technique [0002] Directional drilling in coal mines has the advantages of controllable drilling trajectory, high drilling utilization rate, and high drilling precision. Safe production has played an important role. [0003] At present, the construction of underground directional drilling in coal mines mainly adopts sliding directional drilling technology combined with compound drilling technology. Sliding directional drilling is adopted in the deflection section of the drilling hole, and the elbow of the screw motor is kept facing a fixed direction. During the drilling process, only the rotor of the screw motor drives the drill bit to rotate the broken rock through the transmission shaft, and the rest of the drilli...

AI Technical Summary

Problems solved by technology

Sliding directional drilling is adopted in the deflection section of the drilling hole, and the elbow of the screw motor is kept facing a fixed direction. During the drilling process, only the rotor of the screw motor drives the drill bit to rotate the broken rock through the transmission shaft, and the rest of the drilling tools do not rotate, so as to realize the drilling trajectory Continuous manual control; compound drilling is adopted for the stabilizing section of the drill hole. While the screw motor drives the drill bit to rotate, the power head of the drilling rig also drives the drill tool to rotate and applies drilling pressure to the bottom of the hole to realize compound rock breaking. At this time, the screw motor elbow Periodic changes, manual control of drilling trajectory cannot be realized

[0004] Practice has shown that the drilling trajectory formed by sliding directional drilling has a large curvature, the system pressure increases rapidly during the drilling process, and the drilling efficiency is low. With the increase of the drilling depth, the friction effect in the hole causes the drag of the drill string to make the sliding The depth of directional drilling is limited; while the hole formed by compound drilling has a small curvature, smoother hole wall, low drilling system pressure, high drilling efficiency, and the drilling depth is much greater than that of sliding directional drilling.

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