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Rotary digging machine drill pipe correct cleaning method
Release time:
2018-07-10
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When cleaning the drill pipe of the rotary excavator, we must first understand the cause of the sediment at the bottom of the hole. 1. Residue between bucket teeth of rotary drilling rig and bottom cover of drilling bucket. 2. The bottom cover is not closed tightly. 3. When drilling into mud and sand and flow plastic formation, the drilling slag in the drilling bucket is seriously lost during lifting, and sometimes even all of it is lost in the drilling hole. 4. The soil cut by the edge of the outer edge of the drilling bucket of the rotary drilling rig remains at the edge of the bottom of the hole because the bottom of the hole is a plane that cannot enter the entrance of the cylinder. 5, drilling bucket teeth are sparse arrangement, leakage between teeth is inevitable. 6. The return footage of the drilling bucket is too large, the loading is too full, and the muck is squeezed out from the drainage hole of the top cover. According to the rotary drilling machine method, we
When cleaning the drill pipe of the rotary excavator, we must first understand the cause of the sediment at the bottom of the hole.
1. Residue between bucket teeth of rotary drilling rig and bottom cover of drilling bucket.
2. The bottom cover is not closed tightly.
3. When drilling into mud and sand and flow plastic formation, the drilling slag in the drilling bucket is seriously lost during lifting, and sometimes even all of it is lost in the drilling hole.
4. The soil cut by the edge of the outer edge of the drilling bucket of the rotary drilling rig remains at the edge of the bottom of the hole because the bottom of the hole is a plane that cannot enter the entrance of the cylinder.
5, drilling bucket teeth are sparse arrangement, leakage between teeth is inevitable.
6. The return footage of the drilling bucket is too large, the loading is too full, and the muck is squeezed out from the drainage hole of the top cover.
According to the characteristics of the rotary drilling method, we have developed two methods of hole cleaning, and achieved good results.
At the same time, we can also control the settling speed of soil slag by changing the specific gravity difference between soil slag and mud and increasing or decreasing the viscosity of mud. For example, we should try to reduce the settling speed of soil slag and adapt to increasing the specific gravity and viscosity when preparing mud. On the contrary, we can reduce the specific gravity and viscosity to speed up the settling speed of soil slag of rotary drilling rig.
What if the slag at the bottom of the hole does not reach the standard? For this reason, we must clean the hole. Otherwise, the settlement of the pile top is large and the bearing limit value is reduced. The common methods for hole cleaning of rotary drilling rigs are settlement method and replacement method. The so-called settlement method is to clean the hole after the hole is finished, and the replacement method is to clean the hole bottom immediately after the hole is finished, that is, a method of replacing the mud in the hole with newly prepared mud before the mud has not been deposited from the mud.
For positive and negative circulation drilling, it is appropriate to use slurry exchange to clean the hole, because it can use its own rotary drilling rig drill pipe for positive and negative circulation slurry exchange, while the rotary drilling pipe does not have the function of conveying circulating liquid. To use this method to clean the hole, it is necessary to reprepare the drill pipe and corresponding rotary drilling rig equipment, which is obviously not feasible. However, the settlement method is commonly used by conduit suction pump method, air lifting method and submersible mud pump method.
These methods also have some problems in use, mainly the influence range of the slag suction port. When the aperture is 1.5 meters, if the position of the slag suction port cannot be moved or the bottom of the hole is not stirred by tools, it is difficult to remove the drilling slag far away from the radius.
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