The forward and reverse cycle drilling rigs are the same in the process of drilling holes, and the applicable strata are also basically the same. The difference is the circulation of drilling fluid (slurry). The drilling fluid (slurry) of the positive circulation drilling rig is pumped from the mud pool into the drill pipe by the mud pump, and is continuously transported to the drilling shaft through the drill pipe, and then is naturally discharged from the drilling wellhead, and the drilling slag is brought out to the ground. Come up. Because it is relying on natural circulation of drilling fluid (slurry) for slagging, the circulation capacity and slag discharge capacity are relatively weak. Only a part of drilling slag can be discharged. Drilling slag with relatively large particles cannot be discharged. Drilling slag is more, affecting the drilling speed, and the wear of drilling tools is also relatively large.
The drilling fluid (slurry) of the reverse circulation drilling rig is in the opposite cycle. Its drilling fluid is pumped from the wellhead (outside the drill pipe) of the drilling well to the drilling well, and then pumped with compressed air or mud, from the drill pipe. In the middle, the circulation capacity and the slag discharge capacity are relatively strong. Not only is the slag discharge relatively clean, but also the large-sized drilling slag can be discharged. Drilling slag like eggs can be discharged. Therefore, it is more suitable for drilling holes in relatively large layers such as pebbles.
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