Straightness-keeping and deviation-preventing drilling tool combination for ground large-diameter well drilling

The utility model provides a straight-keeping and deviation-preventing drilling tool assembly for ground large-diameter well drilling, which belongs to the technical field of coal mine ground drilling and comprises a drill bit, a near centralizer, a middle centralizer, an upper centralizer, a first...

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Bibliographische Detailangaben
Hauptverfasser:	ZHANG XINGXING, DU LEI, SU MINGJIN, CHENG HEYU, CHENG ZHIZHONG, CHEN XIAOLEI, DING HUAZHONG, SHI DEZHOU, ZHANG DEFU
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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Beschreibung
Zusammenfassung:	The utility model provides a straight-keeping and deviation-preventing drilling tool assembly for ground large-diameter well drilling, which belongs to the technical field of coal mine ground drilling and comprises a drill bit, a near centralizer, a middle centralizer, an upper centralizer, a first drill collar, a second drill collar, a third drill collar and a drill rod, one end of the near centralizer is mounted on the drill bit, and the other end of the near centralizer is connected with one end of the first drill collar; the other end of the first drill collar is connected with one end of a middle centralizer, the other end of the middle centralizer is connected with one end of a second drill collar, the other end of the second drill collar is connected with one end of an upper centralizer, the other end of the upper centralizer is connected with one end of a third drill collar, and the other end of the third drill collar is connected with a drill rod; the rigidity and the bending resistance of the bottom