Patent ID: 8047286

Claim:
A downhole tool, comprising: a probe comprising: a first inlet having an elongated front cross-sectional shape; and a second inlet surrounding the first inlet; a first flow line in fluid communication with the first inlet; a second flow line in fluid communication with the second inlet; at least one pump configured to draw fluid from a subterranean formation through the first and second inlets into the first and second flow lines, respectively; an optical fluid analyzer proximate the first flow line for measuring optical density of fluid in the first flow line; and a sample chamber selectively connectable to the first inlet through at least the first flow line: wherein: the first flow line comprises a first portion and a second portion; the second flow line comprises a first portion and a second portion; the downhole tool further comprises a crossover selectively positionable in first and second positions; the first crossover position fluidly connects the first portion of the first flow line to the second portion of the first flow line and the first portion of the second flow line to the second portion of the second flow line; and the second crossover position fluidly connects the first portion of the first flow line to the second portion of the second flow line and the first portion of the second flow line to the second portion of the first flow line.