非烃化合物引起的润湿性的变化

Effects of non hydrocarbon compounds on reservoir wettability.

润湿性是控制油藏中流体的位置、流动和分布的主要因素 ,原油中的非烃化合物对油藏润湿性起着重要作用 ,但其中影响润湿性的主要因素至今尚未确定。作者对塔里木盆地的海相和陆相两类原油进行组分分离 ,利用人造岩心 ,按照Amott方法测定和分析了非烃化合物与沥青质的浓度对润湿指数的影响 ,并研究了原油中各组分的含量与润湿性的关系。实验表明 :①同种原油中非烃和沥青质对润湿性的影响情况相似 ,但不同原油中的非烃或沥青质对润湿性的影响有很大差异。据红外光谱分析 ,含强极性基团的非烃化合物比含弱极性基团的非烃化合物对润湿性的影响大。②油湿指数与原油中的烃类、非烃中的胺和吡咯氮等馏分的含量之间无确定关系 。

Wettability is a major facto r controlling the location, flow, and distribution of fluids in a reservoir. The non hydrocarbon compounds of crude oil play an important part in the wettabili ty of reservoirs, but the key factor controlling the wettability has not been id entified yet. According to the Amott index by using artificial cores and the sol utions of non hydrocarbon compounds and asphaltene with different concentration in neutral kerosene, the authors investigated the relation between the wettabil ity and the components of non hydrocarbon compounds and asphaltene in both mari ne an d continental crude oils of the Tarim basin in China. It has been shown from the experiment that the increase of wettability of different crude oil (in which th e compounds and the polarity of non hydrocarbon are different from each other) v aries greatly with the increase of the concentration of non hydrocarbon compoun d s and asphaltene. The more the functional group with strong polarity in the non hydrocarbon compounds the greater the change in wettability will take place. In addition, as the different compounds in non hydrocarbon, components in four kin d s of crude oil have been further determined, it turns out that the content of th e pyridine nitrogen fraction of crude oil is directly correlated with the oil w e t index.