砂岩模型两相驱替实验中油层润湿性的判断

在砂岩模型两相驱替实验过程中,判断油层润湿性应注意以下问题:(1) 应注意砂岩模型及实验流体的可靠性,充分考虑模型制作过程中各种因素及实验流体真实程度对润湿性的影响;(2) 应保证润湿性判断方法的正确性。在利用水驱油方式及水驱油之后的油、水分布状态判断岩石润湿性时,应综合其他方法进行判断;利用孔道中油水弯液面判断润湿性时,应同时观察大小孔道的弯液面,并防止润湿滞后的影响;在利用油水两相自吸量的比较判断润湿性时,应在孔隙空间内部流体状态相似下进行。

DETERMINATION OF OIL RESERVOIR WETTABILITY IN TWO PHASE DISPLACEMENT EXPERIMENT OF SANDROCK MODEL

The reservoir's wettability can be determined in the displacement experiment of oil and water with the natural sandstone micromodels.A lot of information is used in the experiment.Some details should be noticed:1.the reliability of the natural sandstone micromodels and the experimental fluid should be noticed,and various factors that may probably effect the reservoir's wettability should be considered in making the model;2.the wettability determining methods should be correct.When using the distribution state of oil and gas to determine reservoir wettability in displacing oil by water or after the displacement,other methods should be synthesized;when using the interface of oil and water to determine reservoir wettability,the interface in thick and thin pore passages should be observed together,and the affection of wettability hysteresis should be avoided;when using the automatic suction quantity of oil and water to determine reservoir's wettability,it should be carried out under the similar fluid state in pore space.