What are the matters needing attention in the construction of water well drilling rigs
The matters needing attention in the construction of water well drilling rigs are as follows:
1 Check whether the down-the-hole impactor（DTH hammer）, the pipe drilling tool, the casing and the casing shoe are firmly connected before the drilling tool of the water well drilling rig is installed, whether the eccentric drill bit rotates flexibly, and whether the ventilation is smooth.
2. During the drilling process of the water well drilling rig, attention should be paid to the follow-up situation of the casing and the powder discharge in the hole. When the hole is blown, the upward lifting distance of the drilling tool should be strictly controlled to achieve the limit of excessive blow hole powder discharge. It is forbidden to pull out the drilling tool excessively during the drilling process of the water well drilling rig.
3. When the drilling of the water well rig is finished or the drilling tool needs to be replaced, the hole should be cleaned first to blow out the residue at the bottom of the hole, then stop turning, and slowly lift the drilling tool upwards. The lifting force is just enough to lift the drill. If the tool is suitable, the lifting height should be until the back of the eccentric drill bit touches the front end of the casing shoe; then reverse the drill tool at low speed and try to lift the drill tool slowly upwards at the same time. When it is observed that the drilling tool of the water well drilling rig can be lifted smoothly, it indicates that the eccentric drill bit has been folded. At this time, the drilling tool can be lifted according to the conventional method until all the drilling tools are raised.
4. Water well drilling rigs sometimes have too much slag at the bottom of the hole, and the rotating part of the eccentric bit is stuck by the slag, which affects the closing of the eccentric bit. When several trials are still not effective, the compressed air should be delivered, the water well drilling rig should be cleaned again, and the down-the-hole hammer should be used for a short time, and then the drilling tool should be lifted again.
