Schlumberger

Formation Monitoring

Cuttings description

Detailed analysis of of rock cuttings samples taken from the shale shakers to determine their composition, physical attributes, hydrocarbon content, and matrix porosity.

Samples of rock cuttings taken from the shale shakers are prepared for analysis in the surface logging unit. Trained mud loggers examine the cuttings using a fluoroscope, binocular microscope, and laboratory tests to determine their composition, physical attributes, hydrocarbon content, and matrix porosity. Use of industry standard protocol ensures consistent reporting. The information is used to update computerized mud logs at the depth from which the sample originates.

Gas chromatography

Onsite extraction and analysis of gas from the drilling fluid to determine the
C1–C5 composition for gas ratio analysis. Technologies are available to counteract cold mud returns and the contaminating effects of modern drilling fluid components.

Gas traps located at the shale shakers liberate gas from the drilling fluid. The gas is transported under vacuum via a pipe to a gas chromatograph in the surface logging unit. Flame ionization detectors (FIDs) with a fast cycle time determine the C1–C5 composition. The acquisition system records the results in the database at the depth corresponding to the origin of the gas and displays them on the rig monitors and surface logs.

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Geoservices Mud Logging