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

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.