Hydraulically actuated fishing tool

A fishing tool is disclosed which is responsive to hydraulic pressure to move away support 28 for collets 18 to allow the collets to deflect and make contact with the stuck object. Upon removal of the hydraulic force, the support for the collets is returned, preferably by a biasing spring 24, to its...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	LARRY THOMAS PALMER
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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Beschreibung
Zusammenfassung:	A fishing tool is disclosed which is responsive to hydraulic pressure to move away support 28 for collets 18 to allow the collets to deflect and make contact with the stuck object. Upon removal of the hydraulic force, the support for the collets is returned, preferably by a biasing spring 24, to its original position to lend support for the collets while the collets have engaged the stuck object. The object can then be retrieved to the surface. Application of further hydraulic force while the object is engaged releases the support for the collets which allows the collets to disengage from the object. The process can be repeated to obtain successive releases and engagements with the stuck object without taking the fishing tool out of the wellbore.