How to use Horizontal Directional Drilling Machine and precautions

1. According to the torque, push-pull force, and allowable minimum curvature radius of the drilling rig, select the drill pipe with the appropriate specification and model.

2. Avoid connecting large diameter drill pipes with small diameter drill pipes during construction (that is, mixed use of large and small drill pipes) to prevent small drill pipes from being broken or deformed due to insufficient strength.

3. When clamping the drill pipe with a vise, do not clamp the female buckle part of the female joint to prevent the female buckle from being clamped and deformed.

4. Pay attention to the make-up pre-tightening force should be controlled within 15MPa when assembling the drill pipe to prevent the difficulty of breaking out due to excessive pressure. Avoid roasting the joints with fire, which will reduce the mechanical properties of the joints (especially the female joints) and affect the service life. The non-pre-tightened threaded connection swings, and the crests of the threads grind each other to become sharper, and ridges are formed on the side, resulting in thread damage or sticking. If there is no pre-tightening and the step of the box buckle is not pressed tightly, the root of the thread of the male joint will be fatigued and broken. Under the action of the high-pressure liquid flow, the female joint will be pierced and punctured, which will easily lead to longitudinal cracking of the female joint.

5. Note that before installing the drill pipe, clean the pin and box, and apply thread oil (thread oil cannot be replaced by other waste oil or inferior pressure oil) to prevent premature wear or damage of the pin and box .

6. Pay attention to clean the waterway hole before installing the drill pipe to prevent debris from blocking the channel and causing the mud system to hold pressure.

7. Be careful not to forcibly buckle up. When buckling, the male buckle cannot impact the shoulder and thread of the female buckle, and ensure the centering of the male and female joints. Ensure the coaxiality of the shackle of the drilling rig and the main shaft of the power head.

8. Pay attention to check the wear of each part of the drill pipe, and find out the reason for abnormal wear in time:

1) Determine whether the drill pipe is scratched by sharp hard substances in the hole

2) When the scratch marks on the drill pipe body are about 1mm deep and more than one turn in a spiral shape, please use it with caution. Prevent the drill pipe from being broken during construction and cause greater losses.

9. Pay attention to the damage of the short connection type of the drill collar (wrong connection, random connection, severe wear, etc.), and it should be replaced in time to avoid damage to the drill pipe thread.

10. Pay attention to hoisting, and avoid impacting and damaging the male buckle when handling the drill pipe.

11. Pay attention to avoid mixing drill pipes of different button types, even if they are not produced by the same manufacturer, do not mix them (because the technical parameters, processing methods, props used, mechanical equipment of each manufacturer's drill pipes are different, and the tolerances of drill pipes processed are different. Do not mix drill pipes that are too different from old and new, or have too much wear and tear, to avoid construction hazards.

12. It is found that the drill pipe button has local small-scale damage (about 1-2 buttons, button length 10mm), and it should be repaired in time before use.

13. Use qualified zinc-based thread grease, butter is not suitable for use as thread thread oil. Insufficient thread grease will cause high points of damage to the shoulder of the joint, which will easily "loosen" the threaded connection and cause thread damage. If thread compound is not used or unqualified thread compound is used, the surface of the threaded thread will be bonded, resulting in sticking.