APPARATUS AND METHOD FOR MEASURING FORMATION PRESSURE USING A NOZZLE

APPARATUS AND METHOD FOR MEASURING FORMATION PRESSURE USING A NOZZLE

A method for measuring a downhole formation pressure is disclosed which includes lowering a formation testing tool to a desired measuring position i n a well borehole. Then a nozzle in the tool is extended so that the nozzle extends through the mud cake layer on a surface of a formation, forming a s...

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Hauptverfasser: KURKJIAN, ANDREW LORIS, MONTALVO, LAURA, SUNDQUIST, ROBERT WAYNE
Format: Patent
Sprache:eng ; fre
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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creator KURKJIAN, ANDREW LORIS
MONTALVO, LAURA
SUNDQUIST, ROBERT WAYNE
description A method for measuring a downhole formation pressure is disclosed which includes lowering a formation testing tool to a desired measuring position i n a well borehole. Then a nozzle in the tool is extended so that the nozzle extends through the mud cake layer on a surface of a formation, forming a seal between the mud cake layer and a sealing surface of the nozzle. In an embodiment of the invention, the nozzle has a porous tip that extends into the invaded zone beyond the mudcake layer and i s exposed to the formation pressure. In an alternate embodiment, the nozzle has a retractable tip that retracts into the nozzle. The nozzle and retractable tip are positioned in t he mudcake and the retractable tip is retracted into the nozzle. The formation pressure is then communicated through the nozzle to a pressure sensor operatively connected t o the nozzle.
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Then a nozzle in the tool is extended so that the nozzle extends through the mud cake layer on a surface of a formation, forming a seal between the mud cake layer and a sealing surface of the nozzle. In an embodiment of the invention, the nozzle has a porous tip that extends into the invaded zone beyond the mudcake layer and i s exposed to the formation pressure. In an alternate embodiment, the nozzle has a retractable tip that retracts into the nozzle. The nozzle and retractable tip are positioned in t he mudcake and the retractable tip is retracted into the nozzle. 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subjects 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
title APPARATUS AND METHOD FOR MEASURING FORMATION PRESSURE USING A NOZZLE
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