Brines taken from inland natural gas wells are inordinarily different from other ones in their chemical behaviors. As these brines have long been oxygen-free conditions, they would soon be changed with the air in their gualities.
In the Naruto gas field, we chose a well for this experiment and sampled the brine with various methods such as using various species of bottles and various sampling procedures. Spending 20 days, we analyzed them periodically for 13 items, examining whether they were changed or not.
Remarkable changes were observed in ferrous and ferric ion contents, while no changes were observed in most of the items only when those brines were kept properly during these 20 days.
In conclusion from our experiments, brines should be analyzed as soon as they are sampled. And they should be kept free from the air in brown-coloured glass bottles if they could not be analyzed soon after sampled.
