不同采出程度下石油组分变化特征

The Change of Crude Oil Components under Different Production Degrees

利用GHM烃分析仪对水驱模拟实验过程中不同阶段的采出原油进行分析 ,研究其原油组成的变化规律 ,探索原油组成与采出程度之间的内在关系。实验表明 :原油的采出程度与采出流体PV数之间具有良好的对应关系 ;随着采出程度逐渐提高 ,原油中正构烷烃的碳数范围及主峰碳数逐渐后移 ,原油的轻 /重比值呈现降低趋势。实验还证明 ,某些在空间上呈圆柱型、具有规则支链的分子比相近碳数的直链分子更容易被驱出。该项研究对于从微观角度深入探索驱油机理。

Production crude oils are analyzed by geofina hydrocarbon meter(GHM).The oils come from different stages in the process of water expelling simulation experiment. In addition, the change rule of crude oil components is studied. and the internal relations between crude oil components and production degrees are also researched. The experiments indicate that a regular connection is formed between production degree of crude oil and the PV number of fluid.The carbon number range or the peak carbon number of normal alkanes in crude oils shift behind and the light/heavy hydrocarbons ratio exists decreasing direction along with the increase of production degree. The another conclusion is proved by experiment that some isoprenoid alkane molecules are easier to expel from reservoir than the normal alkane molecules of close carbon number because of their column structure in space. Therefore, this investigation has practice significance in researching expelled mechanics from microcosmic points of view and increasing production ratio of crude oils.