zhengji engineering machinery equipment co

Reasons for slippage During the construction process, if dry holes are drilled into mudstone, auger drilling is more efficient. The main reasons for slippage in mudstone are the following points: the hardness of the mudstone, the lubrication of water or mud, the water absorption and softening of the mudstone, etc.
, different Drill Tool Drilling Analysis
When the auger bit drills into the mudstone in the water hole, as the mudstone softens when exposed to water, the cone at the front end of the auger bit will be packed with mudstone muck, forming a whole, and the drill tool will lose its drilling function. After drilling can no longer continue, water or mud will enter between the drill bit and the mudstone to lubricate it, causing slippage. The alloy head can easily break into the mudstone, but because the alloy head at the front end is very short, the pick body that fixes the alloy head must follow the cut. However, the pick body is too blunt, which creates resistance because the pick breaks into the mudstone too shallowly. , Mudstone is cemented, so the crushing effect cannot be achieved, so drilling cannot be continued. Water or mud enters between the pick and the mudstone and lubricates, causing slippage
Through the above analysis, mudstone has good cementation and is not easy to break. It needs to be sharper, drilling and cutting deeper, and cutting resistance is small to achieve the cutting and crushing effect
Operational control is very important. Since the mudstone is hard and has good cementation, it is not easy to cut in under the lubrication of water. Easy. First, raise the power head to the highest level. Then you must control the power head to rotate slowly. The pressurization speed is slow and continuous. The power head and the pressurization speed must match well. If the pressurization stroke is completed and the mudstone is not cut, raise the power head again. Continue drilling until the geological load increases. After that, continue drilling. When the load is too heavy, the power head needs to be raised to reduce the load to protect the components of the drilling rig. When the load is reduced, pressurization needs to continue to prevent water or mud from entering the cutting surface. And reduce the friction coefficient
Slip classification When drilling, due to the softening of the mudstone, two types of slipping phenomena will occur. One is bottom slipping, which is the so-called slipping phenomenon when drilling into the mud layer, and the other is mudstone slipping. Slip, because mudstone is harder, it is more difficult to drill and cut, but it will slip when lubricated by water or mud. There is a difference between the two slips, so the type of slip must be distinguished in order to effectively deal with it
Deal with slip and distinguish The two kinds of slipping are very critical, and the treatment methods are also different. If the mudstone is harder and slips due to the lower friction coefficient of water, through the above series of integrated methods, the mudstone can be overcome due to the difference in cementing material and weathering degree, and its strength changes greatly. Therefore, not all mudstones can be drilled using cutting methods