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2022
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06
Matters needing attention in the process of using the drill
In order to reduce the energy reflection when drilling soft rock, it is necessary to reduce the impact pressure or energy. The greater the given impact pressure, the greater the stress in the drill segment. In order to make the service life of the drilling tool and the drill tail as long as possible, it is necessary to ensure that the working pressure always matches the drill chain.
1. the relationship between drilling parameters and drilling effect:
Impact pressure: The higher the pressure, the higher the piston speed and the greater the energy generated. When the drill is in good contact with the complete hard rock, the shock wave energy can be used to a greater extent. On the contrary, when the drill bit is in poor contact with the rock, the energy cannot leave the drill and is transferred to the rock, but is reflected back to the drill string in the form of tension waves. The greater energy of each impact can only be utilized when drilling holes in sufficiently hard rock. In order to reduce the energy reflection when drilling soft rock, it is necessary to reduce the impact pressure or energy. The greater the given impact pressure, the greater the stress in the drill segment. In order to make the service life of the drilling tool and the drill tail as long as possible, it is necessary to ensure that the working pressure always matches the drill chain.
Propulsion pressure: The purpose of propulsion is to make the drill in close contact with the rock while the drill bit can rotate. The propulsion force needs to be reasonably matched with the impact pressure. Correct propulsion can make drilling more economical; low propulsion pressure will reduce the drilling speed and loosen the threaded connection of the drilling tool; overheating and gurgling of the connecting casing indicate that the propulsion pressure is set too low; if the connecting part is loose, continue drilling, it will increase Energy loss, the temperature of the connecting sleeve is too high, resulting in ablation and fracture of the threaded connection part of the drilling tool, there is also a risk of well deviation, as excessive thrust may bend the drill string.
Steering speed: The purpose of steering is to turn the drill bit to a new position for the next impact. When a cylindrical drill is used, the circumference between impacts is about 10mm. Therefore, it is necessary to adjust the rotation speed according to the impact frequency and the change of the drill diameter. The larger the drill diameter, the lower the speed. Excessive speed will cause excessive wear of bit side teeth;
2. in usedrilling toolIn the process, the following points should be noted:
(1) Before entering the rod, adjust the appropriate impact pressure, propulsion pressure, speed and buffer pressure according to different geological formations, and debug the pressure value to match the geological formation and rock hardness between the pressure values.
(2) When drilling, make the drill sleeve concentric to avoid bending deformation of the drill tail, drilling tool and drill bit.
(3) Avoid empty drilling. If there is empty drilling, stop drilling immediately to avoid excessive damage to the drilling tool.
(4)drilling toolAfter drilling, each discarded drilling tool shall be coated with cooling oil at the threaded end of the drilling tool and the quick connector--. After drilling the blasting hole, the threaded joint of the drilling tool has high temperature and some gravel and mineral water. Coated with cooling oil can lubricate, cool, prevent corrosion and improve the wear resistance of the thread.
(5) In the process of withdrawing the rod, try to avoid repeated vibration of the drill (this operation is one of the major reasons for the damage of the drill). Whendrilling toolWhen the threaded joint is difficult to loosen, inject lubricating oil into the threaded part at the first time, and then pull the rod or loosen the vibrating rod to reduce the direct damage to the thread of the drilling tool during the vibrating rod. When the rod is vibrated, the rock drill will transmit an impact pressure of nearly 200 bar. Under the continuous action of high frequency impact pressure, the stress concentration and high temperature and high heat generated by repeated vibration will cause the burning of the cold welding point at the threaded end of the brazing tool, that is, the ablation pit, or even the melting temperature of the metal to form the pit, thus forming a fatigue source, leading to the early failure of the brazing tool.
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