Gas Chromatography is an instrumental method used for the separation and identification of chemical compounds and gases. This is done by introducing a gas sample into a heated injector and then carried through a separating column by an inert gas (Helium), and then pushed passed a Thermal Conductivity Sensor (TCD). The TCD sensor uses a wheatstone bridge circuit that works by using a pure carrier air (Helium) flowing past one sensor and a sample gas flowing across another sensor. Every component of gas moves through the column at a different rate. The difference in thermal conductivity is measured and amplified by the electronics and then in turn converted into a digital value. This digital value is then given to the instrument's computer software which creates the gas chromatogram curve. The software then uses programmed windows (Time Slots) and calculates the area that resides in these time slots. The area is then multiplied by a pre-determined calibration factor, which in turn gives you a digital readout of each curve in % or ppm. The MTI and Varian are the two models of high speed chromatographs that Continental Laboratories Ltd. currently uses for their Complete and Limited logging services.

Some of the features of the MTI and Varian chromatographs are:

  • Completely portable and compact.
  • Computer generated output and break down of each gas in percent (%) or ppm (parts per million).
  • Gases measured are Methane (c1), Ethane (c2), Propane (c3), Butane (iso / normal) (c4), Pentane (iso / normal) (c5),   Hexanes (c6), Heptanes (c7), Octanes (c8), Carbon Dioxide (co2) and Nitrogen (n2).
  • Gas Sampling Times are 30, 60 or 120 seconds.
  • WITS compatible.
  • Data storage of complete well.
  • Integrated with Continental Laboratories Ltd. Total Gas Detector.
  • Can be set up to calculate Oil, Wetness and Balance ratios.




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