Three misoperations in the use of water well drilling tools:When using the well drill bit, the torque, push and pull force of the drill must be eliminated, and the minimum radius of curvature is allowed to select the drill pipe suitable for the specification and model. Remember not to connect a large diameter drill pipe with a small diameter drill pipe, that is, mix the sizes, which can easily cause the small drill pipe to break or deform.1. During the drilling process, the front crawler of the water well drilling rig is lifted and the mast retreats, and the two forces form a moment, which interrupts the valve of the first section of the water well drilling rig. The top group of the pressure gauge 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, causing the outer rod to bulge.3. Don't look for pressure points when pressurizing, use the machine lock rod 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, the inner key of one rod on the upper end and the side of the oblique key of the second rod Severe wear over a short period of time, resulting in sticking or rolling keys.When drilling a well with a water well drilling rig, the above three points should not be neglected. When using water well drilling tools, it is necessary to eliminate the torque, push and pull force of the drilling rig, and allow the minimum radius of curvature to select a drill pipe suitable for the specification and model. Remember not to connect a large diameter drill pipe with a small diameter drill pipe, that is, mix the sizes, which can easily cause the small drill pipe to break or deform.When clamping the drill pipe with a vise, do not clamp the female part of the female connector, so as to avoid the female buckle being clamped and deformed. Before installing the drill pipe, clean the water channel holes to prevent debris from clogging the water channels and causing back pressure in the mud system. When installing and connecting water well drilling tools, the pre-tightening force of the make-up should be controlled within 15MPa to prevent unloading difficulties caused by excessive pressure. Avoid baking the joint with fire, which will reduce the mechanical properties of the joint (especially the female joint) and affect the service life.The unpre-tightened threaded connection swings, causing the threads of dth hammer drilling to grind each other, making the tooth crest sharper, and producing convex edges on the side, causing thread damage and jamming. If there is no preload, the step of the box is not compressed, which may cause fatigue fracture of the thread root of the male connector. Under the action of high-pressure liquid flow, the female connector will be punctured, resulting in puncture corrosion, which may easily lead to longitudinal cracking of the female connector.