Improvements in or relating to well abandonment and slot recovery

A method and apparatus for casing recovery in well abandonment uses a slip 52 anchored hydraulic jack 18 having a piston 38 moving a mandrel 30, a casing gripping spear 20 and a pressure drop sub 24. A downhole flow pulsing device 22 on the string superimposes a cyclic pressure on the fluid used to...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Eskild Storteig, James Linklater
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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