Abstract
Summary Experiments were performed to quantify the light transmittance and optical density (OD) characteristics of more than 75 fluid samples, including hydrocarbons, formation waters, drilling mud systems, mud filtrates, and mixtures of these fluids. A catalog of characteristic optical fluid analyzer (OFA, Schlumberger Wireline & Testing, Houston) responses has been developed to aid in real-time fluid identification applications. Hydrocarbon responses were found to show a strong correlation between oil gravity and OD. Downhole oil gravity can be estimated from the OFA response by comparison with the database. A new technique for minimizing oil sample contamination by various oil-base mud (OBM) filtrates is proposed. Furthermore, a means is suggested for distinguishing between OBM filtrates and formation hydrocarbons. Several field examples are presented to illustrate the application of the techniques introduced.
Published Version
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