The use of a double-bottomed sand-collecting bucket and cutting-type drilling is consistent with the analysis of slippage issues encountered by rotary drilling rigs when drilling into mudstone or silt layers. However, slippage can still occur with actual sand-collecting buckets, though this is due to a number of factors.#heavy duty drill machine price#
1. Defects in the drill bucket itself, such as the center positioning tip being too long, too wide, or too blunt; the angle of the tooth tips and the gap between the tooth seats; the diameter of the side teeth; the type of bucket teeth; or tooth tip wear. Improvements can be made to reduce the contact area by allowing for variations in the length and height of the tooth tips.
2. The diameter of the sand-collecting bucket. Larger diameter buckets have a larger contact area, making it more difficult to overcome slippage. Therefore, for larger pile diameters, smaller diameter buckets should be used initially.
3. Overcoming Slippage Analysis: As mentioned earlier, the main cause of slippage is lubrication by water or mud. Therefore, overcoming the softened mudstone and the surface water or mud will overcome mudstone slippage! After overcoming this, continuous pressure drilling should be maintained to minimize the power head's idle rotation within the hole. This prevents water or mud from entering the cutting surface, ensuring the drill bit remains in contact with dry geological conditions for normal drilling.
4. Operational Control is Crucial: Due to the hardness and good cementation of mudstone, cutting into it with water lubrication is not easy. First, raise the power head to a higher position. Then, control the power head's rotation slowly, applying pressure gradually and continuously. The speed of the power head and the pressure application must be well-coordinated. If the pressure stroke is completed without penetrating the mudstone, raise the power head again and continue drilling until the geological load increases. Afterward, continue drilling. When the load becomes too heavy, raise the power head to reduce the load and protect the drilling rig components. When the load decreases, continue applying pressure to prevent water or mud from entering the cutting surface and reducing the coefficient of friction.#heavy duty drill machine price#
5. Slippage Classification During drilling, due to the softening of mudstone, two types of slippage may occur: one is bottom slippage, also known as slippage when drilling into the mud layer; the other is mudstone slippage. Because mudstone is inherently harder and difficult to cut, slippage occurs with the lubrication of water or mud slurry. These two types of slippage are distinct, so it is crucial to distinguish between them for effective handling.
6. Handling Slippage Distinguishing between the two types is critical, as the handling methods differ. If it is bottom slippage due to softened mudstone, reverse the direction of drilling and apply pressure to overcome it. If it is slippage due to the harder mudstone reducing the coefficient of friction with water, the aforementioned integrated methods can be used to overcome it. Due to variations in cementing materials and weathering degree, the strength of mudstone varies greatly; therefore, not all mudstone can be drilled using cutting methods.#heavy duty drill machine price#
