Cement retainer

The utility model discloses a cement retainer which comprises a center pipe, an upper slip sleeving the top end of the outer wall of the center pipe, and a lower slip sleeving the lower part of the outer wall of the center pipe, and is characterized in that a reducing step is arranged on the outer d...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	ZOU GANG, TAN LIANXIANG, WANG YANHAO, YANG XIAOCHENG, NING YI
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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Beschreibung
Zusammenfassung:	The utility model discloses a cement retainer which comprises a center pipe, an upper slip sleeving the top end of the outer wall of the center pipe, and a lower slip sleeving the lower part of the outer wall of the center pipe, and is characterized in that a reducing step is arranged on the outer diameter of the center pipe; a uniform distribution hole is formed in the maximum outer diameter; a shear pin is arranged in the uniform distribution hole; clearances are reserved between the upper slip and the center pipe as well as between the lower slip and the center pipe; an upper cone and a lower cone are respectively wedged into the clearances between the upper slip and the center pipe as well as between the lower slip and the center pipe; a rubber sleeve is arranged between the upper cone and the lower cone in the axial direction; the lower end of the outer wall of the center pipe is also connected with a sleeve valve; one end of a valve body is arranged at the lower end of the inner wall of the center pipe,