Slotted screen pipe with stepped slots

The utility model relates to a slotted screen pipe with stepped slots. The slotted screen pipe comprises an outer narrow rectangular slot, a small transition trapezoidal slot and an inner wide rectangular slot. The outer narrow rectangular slot is positioned on an outer circle close to a pipe, the i...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	GAO FUWAN, YANG HELAI, CHEN JING
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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