Patent ID: 9733389
Date: 2017-08-15
CPC Classifications: E21B,G01V

Claim:
1. A method, comprising: conveying a downhole sampling tool within a borehole extending into a subterranean formation; operating the downhole sampling tool to obtain formation fluid from the subterranean formation; flowing the obtained formation fluid through a flowline of the downhole sampling tool; obtaining real-time measurements of the formation fluid flowing through the flowline, including: obtaining real-time density measurements via a densimeter of the downhole sampling tool; and obtaining real-time optical density measurements via a multi-channel optical sensor of the downhole sampling tool, wherein the densimeter and the multi-channel optical sensor are co-located proximate the flowline such that the real-time density measurements and the real-time optical density measurements are obtained substantially simultaneously; and estimating actual contamination of the formation fluid flowing through the flowline based on a relation between the obtained real-time density measurements and the obtained real-time optical density measurements.