Patent ID: 8555968

Claim:
A method for evaluating a fluid from a subterranean formation comprising: positioning a downhole tool in a wellbore, the downhole tool having a probe extending toward the subterranean formation and defining a flow path to receive the fluid from the subterranean formation, the flow path having a wall defining an interior channel disposed within an exterior channel, wherein a portion of the fluid entering the flow path moves through the exterior channel and the remaining portion moves through the interior channel; drawing fluid into the downhole tool via the interior channel at an interior channel flow rate and into the downhole tool via the exterior channel at an exterior channel flow rate; generating a combined flowline from the fluid in the interior channel and the exterior channel; monitoring a contamination level of fluid from the combined flowline; and automatically adjusting a ratio of the interior channel flow rate to the exterior channel flow rate based on the contamination level.