Mass Spectroscopy

 Example Mass Spec Log. Shows C1-C9, Benzene, and Toluene.

Example Mass Spec Log. Shows C1-C9, Benzene, and Toluene.

 

Mass spectroscopy on site

Mass spectroscopy is a valuable analytic technique that ionizes chemical species and sorts the ions based on their mass to charge ratio. This enables us to detect chemicals and elements present in the gas dissolved in drilling fluid. Recent advances in Mass Spectroscopy instrumentation and methods allow its use at the rig site to measure directly the amounts of specific paraffinic and aromatic compounds, CO2, and H2S without the need for chromatographically separating the components.

  • 24-hour monitoring of vacuum and captivator power systems.
  • 24-hour monitoring of mass spectrometer.
  • Data transferred offsite, complete data redundancy.
  • Daily report emailed, including a detailed strip log.
  • Final well report optional, including super data.
  • Uses (C1/Ar36) to distinguish between poor sampling and versus depleted zone.
  • Distinguish between paraffins, naphthenes, and aromatics, Benzene, Toluene, Xylene, and contributions from drilling fluid.
  • Highlight potential fracture / fault zones in the formation.

Statistical analysis of mud gas data can reveal reservoir qualities not otherwise readily observed. For example, normalizing mud gas values and direct comparison with various molecular weight species can begin to characterize hydrocarbon compositions and isolate zones of interests. Standardizing mud gas values and comparison with rate of penetration can establish a mean value across a well's data set and allow gas curves to be evaluated as they deviate from average, which can be indicative of particular “sweet spots” or even depleted sections. Applying gas component ratios and cross-plotting the mass spectrometer data set provides convincing evidence for zones of “likeness” or “unlikeness” which may signal compartmentalization, compositional variations, water saturation, secondary porosity/permeability and other notable geologic conditions.

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