Drilling wells with compressed air blowing downhole
Abstract
Currently, hard rocks account for about 25-30% of the total volume of exploration core drilling. Drilling is carried out by shotgun drilling. By the end of the seven-year plan (1959-1965) about 50% of shot drilling will be replaced by fine-diamond drilling. Thus, the improvement of shot drilling technology still plays a major role in accelerating the exploration of mineral deposits. One of the ways to improve the technology of shot drilling is blowing out the bottom hole with compressed air instead of flushing with water. Air, as a flushing agent, is not able to keep the walls of the well from collapse, but this is not required in shot drilling in strong rocks, as a rule. Compressed air successfully fulfills the other requirements to the flushing agent.
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