Current status of mud gas isotope logging in drilling fluids abroad
The isotope analysis of the current gas sample is sent to the laboratory for analysis after sampling on site. The time and cost of this type of analysis is very high, losing the on-site guiding significance of geological and geochemical analysis in oilfield development. And current field devices generally only perform isotope analysis of C1, so the current application of isotope logging is limited.
UK CSS developed the IsologgerTM, an advanced real-time isotope analysis instrument. The CH4, C2H6, and C3H8 isotope values (including CO2) can be measured in 6 minutes. When designing a completion, IsologgerTM can provide users with a more continuous, detailed isotope analysis data (as opposed to laboratory analysis) and further improve the timeliness and accuracy of the data.
In addition, the measurement process does not affect the drilling operation, no need to stop drilling, simple operation, and cost-effective.
About isologger on-site isotope analyzer
The Isologger On-site Isotope Analyzer features a unique Stable Isotope Ratio Mass Spectrometry (IRMS) system manufactured by CSS (CPS) to meet the specific needs of logging. Since then, the logging industry has added an option for field analysis on isotope analysis.
IsologgerTM is a concept product in the drilling fluid gas isotope analysis (MGIL, short for “Mud Gas Isotope Logging”). It is the world’s first stable isotope ratio mass spectrometer (IRMS) that provides real-time analysis of all-round drilling sites. At the same time, the results of the isotope ratio mass spectrometer (IRMS) are accurate and highly reliable, and the time and economic benefits are immeasurable.
Ø IsologgerTM (Figure 1) is rugged and compact, and is built on a 19-inch iron frame.
Isologger includes gas chromatography (GC), furnaces and stable isotope ratio mass spectrometry (IRMS).
Ø Determine the percentage of 13C by converting the gas collected from the logging (CH4, C2H6, C3H8) into carbon dioxide.
Ø Ground system calibration system ensures the accuracy of gas detection and can correct system errors.
Ø Data can be generated in WITS format and imported into the logging database in chronological order.
Drilling Fluid Gas Isotope Analysis (MGILTM) can be used to understand reservoir potential and sources of hydrocarbon gases. Such as:
Ø Biogenetic or pyrolysis causes
Ø Reservoir / oil and gas maturity
Ø Reservoir connectivity and sealing efficiency
Ø Free gas phase determination
IsologgerTM provides a valuable geochemical data at a lower cost, with the greatest advantage being the ability to perform real-time measurements of carbon isotopes above C1.