恒速压汞与常规压汞的异同

Discussion on the differences between constant-speed mercury injection and conventional mercury injection techniques

何顺利 焦春艳 王建国 罗富平 邹 林

中国石油大学（北京）石油工程教育部重点实验室，北京　102249 中国中化集团石油勘探开发有限公司，北京　100031 中国石油西南油气田分公司重庆气矿，重庆　400021

文中深刻剖析恒速压汞与常规压汞的区别，便于对微观孔隙结构进行分析时选择较合适的实验手段，更加准确地对微观孔隙结构进行描述与表征。从理论模型、实验过程、测量结果的可靠性等方面，分析对比常规压汞与恒速压汞的不同，揭示了它们的本质区别。研究发现：恒速压汞由于其实验过程是准静态过程，可以将孔隙与喉道区别开来，测量值更接近静态毛细管压力，得到的喉道半径结果比较接近真实情况。因此，恒速压汞是研究孔隙结构的比较好的方法。

In this paper, the difference between constant-speed mercury injection and conventional mercury injection techniques was studied in order to choose the correct method to describe the microscopic pore structure accurately. The differences between the conventional mercury injection and constant-speed mercury injection were discussed from the reliability of theoretical model, experimental process and measurements in this paper. So the essential differences between them were revealed. Study result shows that the pore and throat can be distinguished because the experimental process of constant-speed mercury injection is a quasi-static process. The measured values are closer to static capillary pressure and the obtained throat radius is closer to the real situation. Therefore, the constant-speed mercury injection is a good method to study the pore structure.