Method for measuring formation properties with a time-limited formation test

(19)

(11)

EP 1 396 607 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	16.06.2004 Bulletin 2004/25

(43)	Date of publication A2:
	10.03.2004 Bulletin 2004/11

(21)	Application number: 03255458.6

(22)	Date of filing: 02.09.2003

(51)	International Patent Classification (IPC)⁷: E21B 49/00, E21B 49/10

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

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Priority:

09.09.2002 US 237394
09.05.2003 US 434923

(71)	Applicants:
	SERVICES PETROLIERS SCHLUMBERGER 75007 Paris (FR) FR SCHLUMBERGER HOLDINGS LIMITED Road Town, Tortola (VG) NL GB Schlumberger Technology B.V. 2514 JG Den Haag (NL) GR SK DK BG LI ES CY BE SE FI GB NL FR DE CZ RO IE IT MC SI PT LU CH EE AT HU TR

(72)	Inventors:
	Pop, Julian J. Houston Texas 77063 (US) Follini, Jean-Marc Houston Texas 77077 (US) Hache, Jean-Michel Houston Texas 77082 (US)

(74)	Representative: Stoole, Brian David
	Sensa, Gamma House, Chilworth Science Park Southampton, Hampshire SO16 7NS Southampton, Hampshire SO16 7NS (GB)

(54)	Method for measuring formation properties with a time-limited formation test

(57) An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a pretest piston (118a) positionable in fluid communication with the formation, and a series of flowlines pressure gauges (120a,123a,130a), and valves (121a,124a,128a) configured to selectively draw into the apparatus for measurement of one of formation fluid and mud. The method includes performing a first pretest to determine an estimated formation parameter; using the first pretest to design a second pretest and generate refined formation parameters whereby formation properties may be estimated.

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