CENTRALIZER WITH INTEGRATED STOP COLLAR

A method and apparatus for centering a casing section in a wellbore. A centralizer includes a plurality of centralizer bow springs arranged between and around circumferences of end bands. The end bands are arranged over stop collars such that the end bands can rotate about and slide along the stop c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KRIEGER Sebastian F, KIESS Christian
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A method and apparatus for centering a casing section in a wellbore. A centralizer includes a plurality of centralizer bow springs arranged between and around circumferences of end bands. The end bands are arranged over stop collars such that the end bands can rotate about and slide along the stop collars. At least one stop collar includes a radially-inward-extending lug that engages a groove in the stop collar. The groove limits the amount by which the end band can slide relative to the stop collar. When the centralizer is lowered into a wellbore, an interference between the lug in the end band and the groove in the stop collar can pull the centralizer into the wellbore. The pulling force can prevent the centralizer bow springs from expanding radially outward due to contact forces with edges of the wellbore.