DOWN HOLE GAS ANALYZER METHOD AND APPARATUS

摘要

A logging while drilling and wire line system (10) for analyzing the concentration of carbon dioxide or another substance, in a sample down hole in a bore hole (12). A chamber (20) is filled with a sample that may be fluid, or condensate and gas. The interior chamber volume (22) is selectably expandable for decompression of the sample. The sample may alternately be decompressed by allowing a sample at formation pressure to enter the chamber at a lower pressure, thereby decompressing the sample. A sensor (28) measures the absorbance, transmittance or attenuated total reflectance of the infrared light. Mid and near infrared light is utilized to identify carbon dioxide, water and a plurality of hydrocarbons. A wiper cleans the transmitter (26) and sensor between readings to reduce measurement error caused by fluid sample contamination.