Research and Application of Booster Compressor For Air Dth Hammer In Deep Well

The highest back-pressure can be maintained below 7MPa when drilling with air DTH hammer in deep Wells, but the lifting water pressure is very high when the water in the well bore needs to be pulled out after tripping in. When the well depth is 2500-3000 m, the lifting pressure is as high as 25-30MPa. At present, the maximum pressure of large displacement booster on the market is about 12-15MPa, which has large pressure redundancy for normal drilling and is too low pressure to lift water, making this booster costly but unable to meet the needs of lifting water. The author's team cooperated with the domestic manufacturers of deep well air DTH hammer drilling equipment, and jointly developed the high-pressure and large-displacement booster and ultra-high-pressure and small-displacement booster, which can not only achieve normal drilling operations, but also meet the requirements of drilling and water lifting, with low cost. This paper will comprehensively introduce the research and development achievements in this field, in order to promote the popularization of efficient air DTH drilling technology in China's geothermal industry.