Apparatus for de-clamping loose formation well pipe

The invention discloses a jam releasing device for well pipes in unconsolidated formation; the jam releasing device is composed of a hollow cylindrical impact bar and a cylindrical inside band fixedly connected in the middle part of the impact bar; the axle line of the inside band is parallel to tha...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHU HENGYIN, CAI ZHENGSHUI, ZHOU YONGQIAN, QI XUEZHONG, ZHANG WENSHENG
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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