Adjustable constant-current stopper

The utility model relates to an adjustable constant-current stopper for testing a water injection well in the oil extraction. The lower part of a salvaging head on the constant-current stopper is arranged in a shell, a regulating rod is fixed at the lower end, and threads in the lower part of the re...

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Bibliographische Detailangaben
Hauptverfasser:	ZHANG CHUANJUN, WANG HUAIYUAN, WU YUHUA, SUN YUFEI, HOU ZHUOZHI
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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