GALVANICALLY ISOLATED EXIT JOINT FOR WELL JUNCTION

A well system for forming a window in a casing string positioned in a wellbore. The system includes first and second steel casing joints (462, 464) interconnectable within the casing string. An aluminum exit joint (460) is positioned between the first and second steel casing joints (462, 464). The a...

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Bibliographische Detailangaben
Hauptverfasser:	ZIMMERMAN, MICHAEL, PAUL, STEELE, DAVID, JOE, CHEN, PAO-SHIH
Format:	Patent
Sprache:	eng ; fre ; ger
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 well system for forming a window in a casing string positioned in a wellbore. The system includes first and second steel casing joints (462, 464) interconnectable within the casing string. An aluminum exit joint (460) is positioned between the first and second steel casing joints (462, 464). The aluminum exit joint (460) has a first interconnection with the first steel casing joint (462) and a second interconnection with the second steel casing joint (464). The aluminum exit joint (460) is operable to have the window formed therethrough. A first sleeve (470) is positioned within the first interconnection to provide galvanic isolation between the aluminum exit joint (460) and the first steel casing joint (462). A second sleeve (472) is positioned within the second interconnection to provide galvanic isolation between the aluminum exit joint (460) and the second steel casing joint (464).