When using water well drilling tools, we must eliminate the torque, push and pull force of the drill, and allow the minimum radius of curvature to select the drill pipe suitable for the specification and model. Remember not to connect large-diameter drill pipes with small-diameter drill pipes, in other words, use a mix of sizes, which is very easy to cause small drill pipes to be broken or deformed.

　　1. During the drilling process, the front crawler of the water well drilling rig is lifted, the mast is back, and the two forces form a moment to break the valve of the first section of water well drilling tools. The top group of the pressure table and the oblique key of the first section rod are most likely to be broken by the flap.

　　2. In the process of lowering the drill pipe, there is no buffer when the two adjacent rods are in contact, resulting in the impact of the inner rod swivel and the inner key of the outer rod, and bulging the lower pipe of the outer rod.

　　3. Don’t find the pressure point when pressurizing, use the machine lock lever as the friction rod, the contact surface between the inner key of one rod and the oblique key of the second rod is very small, and the upper-end face of the inner key of one rod and the side of the oblique key of the second rod in a short time Severe wear, resulting in a stick or roll key.

　　The above three points should not be careless when using a water well drilling rig to drill a well. When using water well drilling tools, we must eliminate the torque, push and pull force of the drilling rig, and allow the minimum radius of curvature to select the drill pipe suitable for the specification and model. Remember not to connect large-diameter drill pipes with small-diameter drill pipes, in other words, use a mix of sizes, which is very easy to cause small drill pipes to be broken or deformed.

　　When clamping the drill rod with a vise, do not clamp the female part of the female connector to prevent the female buckle from being clamped and deformed. Before installing the drill pipe, clean the water channel hole to prevent the debris from blocking the channel and causing the mud system to hold back pressure. When installing and connecting water well drilling tools, the pre-tightening force of make-up should be controlled within 15MPa to prevent the difficulty of unloading due to excessive pressure. Avoid using fire to bake the joint, which will reduce the mechanical properties of the joint (especially the female joint) and affect the service life.

　　Without pre-tightening the threaded connection swings, causing the threads of the water well drilling tools to grind each other to sharpen the crests, and produce ridges on the sides, resulting in the damage of the threads and the phenomenon of sticking. If there is no pre-tightening and the step of the female buckle is not pressed tightly, the thread root of the male joint may be fatigued and broken. Under the action of high-pressure liquid flow, the female joint will be pierced, resulting in puncture corrosion, which may easily lead to longitudinal cracking of the female joint.