METHOD OF DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS, MEASUREMENT CONTROLLER FOR DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS, AND APPARATUS FOR DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS

A downhole characterization apparatus for formation fluids is provided. The apparatus comprises a downhole tool including a flowline for flowing the formation fluids capable of isolating a quantity of the formation fluids in a portion thereof; and a pump unit for depressurizing the isolated formatio...

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Bibliographische Detailangaben
Hauptverfasser:	KINJO HIDEKI, DONG CHENGLI, BETANCOURT SORAYA S, NAKAYAMA TAKEAKI, O'KEEFE MICHAEL, MULLINS OLIVER C, TERABAYASHI TORU, CHIKENJI AKIHITO, YAMATE TSUTOMU
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 downhole characterization apparatus for formation fluids is provided. The apparatus comprises a downhole tool including a flowline for flowing the formation fluids capable of isolating a quantity of the formation fluids in a portion thereof; and a pump unit for depressurizing the isolated formation fluids; and a measurement controller which controls the downhole tool. The measurement controller includes a rough value estimation unit which estimates a rough value of the bubble point pressure of the formation fluids; and a speed controller which controls the depressurizing speed of the pump unit such that the isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and the isolated fluids are depressurized at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.