How Can The "verticality of The Borehole" of A Second-hand Rotary Drilling Rig Be Guaranteed? The Accessories Are in Coordination with The Operation

In the construction of second-hand rotary drilling RIGS, the verticality of the borehole directly affects the project quality, and this requires a close coordination between the performance of the accessories and the operation specifications. The following breaks down specific guarantee methods from six key dimensions:

1. Check the straightness of the drill pipe: If the second-hand drill pipe is bent, it is easy to cause the drilling to shift. The straightness should be checked first with a level. Slight bending can be corrected, but severe deformation must be replaced. This is the basic accessory requirement to ensure verticality.

2. Calibrate the guiding device: If the guiding frame, centering device and other accessories of the drilling rig are loose or offset, they will lose their guiding function. Before construction, the components need to be tightened and the angles calibrated to ensure that the guiding direction is consistent with the drilling target.

3. Strictly control the selection and condition of drill bits: Choose matching drill bits based on geological conditions, such as cone drill bits for rock strata and spiral drill bits for clay. At the same time, check the wear of the drill bit. Severe wear will cause uneven force distribution and affect the verticality of the borehole.

4. Standardize the start-up and leveling operation: Before construction, use a drilling rig level to adjust the machine body to a horizontal position to prevent the machine body from tilting and causing the drilling to deviate from the direction at the beginning. After starting up, conduct a low-speed test drill first to ensure it is vertical before proceeding with normal drilling.

5. Control the drilling speed and force: When encountering uneven geological conditions, the drilling speed should be slowed down to prevent the drill pipe from shifting due to sudden changes in force. At the same time, adjust the pressure of the oil cylinder according to the geological conditions to maintain a uniform drilling speed.

6. Regularly stop the machine to check the verticality: During the drilling process, stop the machine every 5 to 10 meters and use an inclinometer to detect the verticality of the borehole. If a slight deviation is found, it can be gradually corrected by adjusting the drilling direction to prevent the deviation from expanding.

In conclusion, the guarantee of the verticality of the drilled holes of second-hand rotary drilling RIGS not only relies on the advance inspection and maintenance of core components such as drill pipes, guiding devices, and drill bits, but also depends on standardized operations such as leveling, speed control, and regular rechecking. Only when the performance of the accessories meets the standards and the operation procedures are in place can the drilling deviation be effectively avoided and the quality of the engineering foundation be guaranteed.