PIPE IN PIPE PISTON THRUST SYSTEM

A pipe in pipe piston thrust system (10) comprises a plurality of piston assemblies (12, 14) configured to sealingly engage a wellbore (16), a pump (26) configured to transfer a fluid (20) into the wellbore, and a by-pass (18A, 18B) disposed between a plurality of annuli (22, 24, 30) formed by the p...

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Bibliographische Detailangaben
1. Verfasser:	HAY, RICHARD THOMAS
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 pipe in pipe piston thrust system (10) comprises a plurality of piston assemblies (12, 14) configured to sealingly engage a wellbore (16), a pump (26) configured to transfer a fluid (20) into the wellbore, and a by-pass (18A, 18B) disposed between a plurality of annuli (22, 24, 30) formed by the plurality of piston assemblies. The by-pass allows for selective communication of the fluid between the plurality of annuli. FIGURE 1A