Hydraulic perforate non-drilling stage collar

The utility model relates to a hydraulic perforate non-drilling stage collar, aiming to solve the problem that drilling stage collar and cement plugs is still required after a well is cemented. The utility model is characterized in that a cement infusing aperture (6) and a pressure transferring aper...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	JIANG XINGFU, ZHANG XINWEN, NIU JIANMEI, ZHAI YAFENG, GUO JIANJUN, GUO XINCHAO, FENG XINWU
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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