Compact sandstone oil surveys uses drill bit fixing device

Compact sandstone oil surveys uses drill bit fixing device, including drill bit, connecting thread cover etc. The drill bit middle part has the external screw thread shaft part, external screw thread shaft part and thread bush internal thread hole threaded connection, the transmission shaft lower pa...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	MA KECONG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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