Patent ID: 7793713

Claim:
An apparatus, comprising: a probe assembly extendable from a downhole tool disposed in a wellbore penetrating a subsurface formation, wherein the probe assembly comprises: an outer packer configured to sealingly engage a first portion of the wellbore, the outer packer having a bore therethrough; an inner packer disposed in the bore of the outer packer and forming an annulus therebetween, the inner packer configured to sealingly engage a second portion of the wellbore within the first portion, wherein a first inlet comprising the annulus is configured to admit virgin fluid and contaminated fluid from the formation into the downhole tool, and wherein a second inlet comprising a bore extending through the inner packer is configured to admit virgin fluid from the formation into the downhole tool; a flow line fluid coupled to at least one of the first and second inlets, wherein the flow line comprises a filter configured to filter particles in fluid admitted by the at least one of the first and second inlets; a sampling tube operatively connected to the inner packer and moveable relative to the outer packer; and a piston disposed within the sampling tube, wherein the piston comprises an axial passageway and one or more sidewall perforations configured to conduct virgin fluid admitted to the sampling tube via the second inlet.