Schlumberger Technology Corporation

Thomas Distefano

Oliver Clinton Mullins

Andrew L Kurkjian

Robin McGowan

Ian Traboulay

The compressibility of a formation hydrocarbon sample is determined downhole by using a borehole tool to obtain the sample downhole, and, at two different pressures, subjecting the sample to near infrared illumination and conducting spectral absorption measurement of peaks at and/or around about 6,000 cm and/or at and/or about 5,800 cm (the absorption peaks of methane and crude oil respectively). The compressibility of the sample is determined from the change in the peak areas, the change in pressure, and the measured peak area itself. According to a preferred embodiment of the invention, the pressure is changed at least 2000 pounds per square inch (psi), and preferably 4000 or more psi between measurements.

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New Orleans, LA, United States of America

Thomas Distefano