How to choose hydraulic drilling rig bits for different formations?
For different types of water well drilling rig equipment, it is necessary to match different drill bits in production. When choosing a drill, you should pay attention to the following aspects:
- When producing in soft rock with good drillability, the drilling speed is faster, and a large amount of slag discharge and high-quality slag discharge must be selected, and the shape of the four wings is preferably selected.
- When producing in hard rock, due to the high strength of the rock, each column tooth and drill bit need to bear a large amount of load. Therefore, it is necessary to choose a bit with a higher strength bit body and column teeth.
- When drilling rocks with clay, the slag hole often looks clogged due to the loosening of the clay, and side slag drill bits can be selected.
- The toughness is better when drilling in the rock, you can choose the toothed bit to ensure safe production.
Due to the different geological structures in different places, this leads to some difficulties in construction, such as gypsum and sand layers are common. When drilling such a layer, it is necessary to increase the viscosity of the drilling fluid and increase the content of bentonite in the drilling fluid. Generally speaking, more than 10% is required. Add a single seal to enhance the wall-forming properties of the drilling fluid. By appropriately reducing the displacement and reducing the erosion of the quicksand layer, the well section must be sealed with thick mud with a viscosity greater than 80s before drilling to ensure drilling, electrical measurement and laying of water well rigs.
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