CENTRALIZER AND CASING STRING

FIELD: drilling equipment, applicable in centering of casing strings in casing and cementation of directional and horizontal wells. SUBSTANCE: centralizers are made in form of segment bodies welded to casing. Segment body cavities radial to casing string accommodate self-extensible, due to pressure...

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Bibliographische Detailangaben
Hauptverfasser:	ALEKSEEV D.L, JANTURIN R.A, KHANIPOV R.V, KHAJRULLIN V.F, GILJAZOV R.R, GILJAZOV R.M, RAMAZANOV G.S
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:	FIELD: drilling equipment, applicable in centering of casing strings in casing and cementation of directional and horizontal wells. SUBSTANCE: centralizers are made in form of segment bodies welded to casing. Segment body cavities radial to casing string accommodate self-extensible, due to pressure differential in casing cavity and annular space, centering members which after extension with forced lifting of casing section from well lower wall are rigidly fixed in new working position. Centralizers are located along centered part of casing string over helical line or in separate subs at rated spacing. EFFECT: facilitated lowering of casing string into horizontal and directional wells. 6 cl, 5 dwg