COMBINED CRUSHING SUPER-VARIABLE-DIAMETER DRILL BIT FOR NATURAL GAS HYDRATE EXPLOITATION

The present invention relates to a combined crushing super-variable-diameter drill bit for natural gas hydrate exploitation, including a joint, an outer cylinder connected to the joint by thread, a nozzle I mounted in the outer cylinder, a mechanical locking mechanism, a blade telescoping mechanism,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	ZHOU, Shouwei, HE, Yufa, LU, Jiang, Li, Zhong, ZHONG, Lin, Li, Qingping, WANG, Leizhen, LIU, Qingyou, ZHU, Jianglin, TANG, Yang, Li, Yanjun, Li, Xushen, WANG, Guorong, JING, Xin, LIU, Hexing
Format:	Patent
Sprache:	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 present invention relates to a combined crushing super-variable-diameter drill bit for natural gas hydrate exploitation, including a joint, an outer cylinder connected to the joint by thread, a nozzle I mounted in the outer cylinder, a mechanical locking mechanism, a blade telescoping mechanism, an end cap connected to the outer cylinder by thread, a seal ring IV mounted to the end cap, and a nozzle II mounted in the end cap by threaded connection. The present invention achieves integrated operation of conventional drilling and draw-back expanding, which can effectively solve the problems that the existing hydrate drill bit cannot drill a large borehole, cannot mechanically lock an extending position of the blade to stabilize the size of the borehole, and a single crushing method is inefficient.