天然气组分的溶解特征及其意义

DISSOLVING CHARACTER FOR THE COMPONENTS OF NATURAL GAS AND ITS SIGNIFICANCE

通过模拟实验方法研究了天然气组分在地层水中的溶解特征。发现在多组分体系中，重烃气的溶解度随矿化度的增大出现先增后减现象；环烷酸类有机物对长链烃气组分有明显的增溶作用。分压及其他条件相同时，天然气组分的溶解能力顺序为：ＣＯ２＞ＣＨ４＞Ｎ２＞Ｃ２Ｈ６＞Ｃ３Ｈ８＞ｎ－Ｃ４Ｈ１０＞ｉ－Ｃ４Ｈ１０＞ｎ－Ｃ５Ｈ１２＞ｉ－Ｃ５Ｈ１２。

The dissolving characteristics for the components of natural gas in formation water are studied by simulating experiment.In the multicomponent system,it is found that the solubility for heavy-hydrocarbon gases increases at first and then decreases with increasing salinity.The solubilization effect of naphthenic acid on the component of long chain hydrocarbon gases is observed.Under the same condition,the sequence of soluble ability for the components of natural gas is as follows:CO 2>CH 4>N 2>C 2H 6>C 3H 8>n-C 4H 10 >i-C 4H 10 >n-C 5H 12 >i-C 5H 12 .