Drilling method of drill bit in deep hole drilling and problems needing attention in operation
we understand the importance of drilling methods and operational precautions in deep-hole drilling. Different geological formations have different characteristics, so drilling operations need to be conducted according to the structural characteristics of the borehole.
When drilling through fault zones, the collapse, fragmentation, and compaction of the formations can lead to various issues such as high flow rates, small voids, and significant pump pressure losses, thereby hindering smooth drilling progress. Additionally, there are risks of misplacement or breakage during the extraction and insertion of ultra-deep casings.
To address these challenges, we have implemented several measures during actual drilling operations. Firstly, we opt for larger diameter drill bits and utilize reaming tools to enhance drilling efficiency and stability. Throughout the drilling process, we continuously adjust the performance of flushing fluids and conduct multiple washes to maintain borehole cleanliness. Furthermore, meticulous weighing is conducted before and after each drilling cycle to avoid errors during disengagement or bit failure, and accurate measurements of surplus lengths on the rig are taken to ensure positional accuracy.
Moreover, we remain vigilant of pump pressures, water returns, abnormal sounds, and changes in electric currents within the borehole to mitigate the risks of burning or breaking the drill. Given the significant frictional resistance in deep-hole drilling, we employ techniques to lift the drill bit off the borehole bottom, gradually engage the clutch when the rotation speed approaches the designated level, and then slowly proceed with normal drilling to prevent sudden torque increases that may lead to drill rod fractures.
In conclusion, the use of down-the-hole (DTH) drill bits has significantly improved drilling efficiency and reduced project costs in deep-hole drilling projects, contributing significantly to energy and mineral exploration. We are committed to continually optimizing our drilling processes, enhancing operational efficiency, and delivering reliable and efficient products and services to our customers.
