Retrieving a sample of formation fluid in as cased hole

Details Retrieving a sample of formation fluid in as cased hole Retrieving a sample of formation fluid in as cased hole

2005-04-12

2005-04-12

Bagnell, David (Department: 3672)

Wells

Processes

Sampling well fluid

C166S254200, C166S250120, C166S298000, C166S055100, C175S041000, C175S059000, C073S152170, C073S152260

Reexamination Certificate

active

06877559

ABSTRACT:
A method for retrieving a formation fluid sample through a cased borehole utilizing a sampling tool. Sampling tool straddle packers are set about a first set of perforations and annular fluid is drained from the isolated zone, through a central conduit in the tool and discharged above or below the packers. Formation fluid is induced to flow into the central conduit and into sample chambers. The packers are unset, the tool moved to the next set of perforations that are azimuthally offset from the first set of perforations and the sampling process repeated, with subsequent samples being placed in separate sample chambers.

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