The Difference between Constant-rate Mercury Injection and Constant-pressure Mercury Injection and the Application in Reservoir Assessment
Received date: 2014-11-26
Revised date: 2015-01-08
Online published: 2015-07-10
The theory and method of constant-rate mercury injection and constant-pressure mercury injection is discussed in the paper.Through the testing and analysis of field rock sample,the difference between constant-rate mercury injection and constant-pressure mercury injection advantages and disadvantages and range of application was contrast,and the impact of experiment pressure on the experiment result is analyzed.The characteristics of constant-pressure mercury injection are fast speed,high experiment pressure and wind range pore radius.So it is suitable to test the majority of samples which are used in production and research.The testing speed of constant-rate mercury injection is very slow,and it can provide parameters of pore and throat and characterize the pore structure of porous medium.The experimental pressure of constant-rate mercury injection is low,so the testing sample pore radius range is small and tight rock parameters are incomplete.The scientific researcher should learn the pore radius range of rock sample and determine a reasonable experimental pressure before choosing the mercury injection method.In general,the permeability of tight rock sample is lower than 1×10-3μm2,so the constant-rate mercury injection should be used carefully.In order to acquire more representative pore characteristic parameters,the experimental pressure of constant-pressure mercury injection should be as big as possible.
ZHU Hua-yin,AN Lai-zhi,JIAO Chun-yan . The Difference between Constant-rate Mercury Injection and Constant-pressure Mercury Injection and the Application in Reservoir Assessment[J]. Natural Gas Geoscience, 2015 , 26(7) : 1316 -1322 . DOI: 10.11764/j.issn.1672-1926.2015.07.1316
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