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The drill pipe/casing protector comprises a protective sleeve (22) preferably made from a compressible material secured to the exterior of the drill pipe. The sleeve rotates with the drill pipe during normal drilling operations in which there is an absence of contact between the sleeve and the casin...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KRUEGER, ERNST R, KRUEGER, WILLIAM E
Format:	Patent
Sprache:	dan
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The drill pipe/casing protector comprises a protective sleeve (22) preferably made from a compressible material secured to the exterior of the drill pipe. The sleeve rotates with the drill pipe during normal drilling operations in which there is an absence of contact between the sleeve and the casing, but the sleeve stops rotating or rotates very slowly while allowing the drill pipe to continue rotating within the sleeve, upon frictional contact between the sleeve and casing. One or more thrust bearings (24,26) rigidly affixed to the drill pipe maintain the sleeve in a fixed axial position on the drill pipe during contact between the sleeve and the casing. The sleeve includes spaced apart longitudinal grooves (25) and wedged I.D. faces between the grooves for circulating drilling fluid through the space between the sleeve and rotary drill pipe for maintaining a fluid film in the space to reduce frictional drag between the rotating drill pipe and the sleeve when the sleeve stops rotating.