A down-the-hole hammer tool that is actuated by drilling mud has been tested recently in simulated borehole conditions. Improvements in drilling rate on the order of 20% to 300% have been noted during these tests, depending on drilling conditions. Further laboratory testing has shown a potential improvement in these benefits by changes to valve timing. In addition, bit design and component life issues are discussed.
Rotary-percussive drilling engine
1998
Seiten
Conference paper
Storage medium
English
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