论文部分内容阅读
阐述了恒速压汞和恒压压汞的原理方法,通过实际岩样的测试分析,比较了2种不同方法的优缺点和适用范围,分析了实验压力对实验结果的影响。恒压压汞测试速度快、实验压力高、可测试孔隙介质的孔径范围广,适宜于大量的生产及科研样品测试;恒速压汞测试速度非常慢,可区分给出孔隙与喉道的不同参数,能更加精确地表征多孔介质的孔隙结构,但目前恒速压汞仪的实验压力相对较低,可测试样品的孔径范围有限,对致密岩样测试获取的参数信息不全面。建议研究者在选用不同方法时,需要提前了解岩样的孔隙分布范围,确定合理的实验压力,一般来说,致密砂岩基质渗透率低于1×10-3μm2以下,对恒速压汞就应慎重使用,而进行恒压压汞时则应增大实验压力,以获得更具代表性的孔隙特征参数。
The principles and methods of constant pressure mercury injection and constant pressure mercury injection are expounded. The advantages and disadvantages of two different methods and the applicable scope are compared through the test analysis of actual rock samples. The influence of experimental pressure on the experimental results is analyzed. Constant pressure mercury injection test speed, high experimental pressure, porous media can test a wide range of pore size, suitable for a large number of production and research sample testing; constant pressure mercury injection test is very slow, can distinguish between the pore and throat Parameters of porous media can more accurately characterize the pore structure of porous media. However, the experimental pressure of constant pressure mercury porosimeter is relatively low at present, and the range of pore size of the test sample is limited. It is recommended that researchers choose different methods and need to understand the pore distribution of rock samples in advance to determine the reasonable experimental pressure. Generally speaking, when the permeability of tight sandstone matrix is less than 1 × 10-3μm2, Careful use, and constant pressure mercury injection should increase the experimental pressure, in order to obtain a more representative pore parameters.