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三水盆地某井是二氧化碳气井,该井气体成分为:二氧化碳99.5％、烷烃组份<0.5％。但在钻井过程中采用一般气测仪检测,却出现烷烃组份偏高,甲烷含量达3—5％、全烃高达8—10％,甚至达12％。针对这种异常现象,我们进行了研究。 1.峰值与二氧化碳浓度关系的试验 在氢焰检测器中,选择近似于机台现场检测的低压(柱前压)、低流(载气流速)的分离分析条件,利用不同比例的空气和二氧化碳作为配样的底气,加入同量的甲烷等气体,在相同条件下进行分析,
A well in the Sanshui Basin is a carbon dioxide gas well. The gas composition of the well is 99.5% of carbon dioxide and <0.5% of alkane components. However, during the drilling process using the general gas detector testing, but there are high alkane components, methane content of 3-5%, up to 8-10% of all hydrocarbons, or even up to 12%. In response to this anomaly, we conducted a study. 1. Peak and carbon dioxide concentration test In the hydrogen flame detector, select the low-pressure (pre-column pressure), low flow (carrier gas flow rate) of the separation analysis conditions similar to the machine site testing, the use of different proportions of air and carbon dioxide As the stamina with the sample, adding the same amount of methane and other gases, under the same conditions for analysis,