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The relationship between drilling parameters and drilling effect-Yikuang Science and Technology
Release time:
2020-09-09
Author:
Source:
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 bit is in good contact with the complete hard rock, the shock wave energy can be maximized. On the contrary, when the contact between the drill bit and the rock is not good, the energy cannot leave the drilling tool and be transmitted to the rock, but is reflected back to the drilling tool chain as a tension wave. Only when drilling holes in sufficiently hard rock can the maximum energy of each impact be used. In order to reduce energy reflection when drilling soft rock, the impact pressure or energy must be reduced. The greater any given impact pressure, the greater the stress in the drill pipe section. In order to make the drill rod, drill tail
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 bit is in good contact with the complete hard rock, the shock wave energy can be maximized. On the contrary, when the contact between the drill bit and the rock is not good, the energy cannot leave the drilling tool and be transmitted to the rock, but is reflected back to the drilling tool chain as a tension wave. Only when drilling holes in sufficiently hard rock can the maximum energy of each impact be used. In order to reduce energy reflection when drilling soft rock, the impact pressure or energy must be reduced. The greater any given impact pressure, the greater the stress in the drill pipe section. In order to make the service life of the drill rod and drill tail as long as possible, it must be ensured that the working pressure must match the drilling tool chain at any time.
Propulsion pressure: The purpose of propulsion is to make the drill bit and rock close contact, while the drill bit can also turn. The propulsion force must be reasonably matched with the impact pressure. The correct propulsion force can make drilling the most economical; the low propulsion pressure will reduce the penetration speed and loosen the threaded connection part of the drilling tool; the overheating of the connecting sleeve and the rattling noise indicate the too low propulsion pressure setting; if the connection part is loose and continues to drill, the energy loss will increase and the temperature of the connecting sleeve will be too high, resulting in ablation and fracture of the threaded connection part of the drilling tool; if the propulsion force is too large, the rotating speed will decrease, the penetration rate is also reduced and there is a risk of sticking; in addition, there is a risk of deflection of the drill hole, because the thrust force is too high and the drill chain tends to bend.
Rotation speed: The purpose of rotation is to turn the drill bit to a new position for the next impact. When using a column tooth drill, the circumference between two impacts is about 10mm. Therefore, the rotation speed must be adjusted according to the impact frequency and the change of the drill diameter. The larger the diameter of the drill bit, the lower the speed should be. Excessive rotational speed will cause excessive wear of the bit teeth.
Key words:
Technology, drill bit, pressure, impact, energy, speed, propulsion, propulsion, generation, rock
