Schlumberger Technology Corporation

Kristofer Gunnar Paso

Bhavani Raghuraman

Neil William Bostrom

Jagdish H Shah

Oleg Zhdaneev

Methods and related systems are described for high pressure chromatographic analysis. The described system includes a flowpath adapted to flow a mobile phase and the sample at high pressures, an injector adapted to inject the fluid sample into a flowpath, a separation column adapted to operate at high pressures for separating various components, a detector and a processor that calculates the amount of at least one component of the fluid sample. The system can operate a pressures above 20 atm or even 100 atm, and temperatures above about 100 degrees Celsius. The system can deployed in a wellbore in a subterranean rock formation, and include fluid collection system for obtaining the fluid sample downhole. The system can also be located close to a wellhead and includes a tap in fluid communication with a surface flowline carrying produced fluids and the injector.

High pressure and high temperature chromatography

The operation, analysis and interpretation of a chromatographic system can be significantly enhanced by coupling therewith one or more fluid property measurements that provides an initial indication of the fluid type, the presence of any contamination, an estimate of the hydrocarbon composition (C1, C2-C5 and C6+), gas/oil ratio, color and/or fluorescence measurements. Other measurements that can be used in the initial stage can include density, viscosity, phase transition determinations. These measurements may be used to enhance, in real-time, the GC sampling protocol, the analysis protocol and also improve the robustness of the interpretation of the chromatogram.

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Brooklyn Park, MN, United States of America

Kristofer Gunnar Paso