Apparent Permeability Loss Over Time in Long-Term Measurements Using the Steady-State Method
The paper analyzes possible causes of time trends observed under constant net confining stresses in long-term measurements of low-permeable sample permeabilities. Experimental study of flow in a limestone core sample was conducted. During the experiment with duration of 40 days, the fluid pumping was carried out in several stages with different constant values of the confining pressure and the pore pressure gradient. As a result, the permeability of the sample decreased by 10 times. It was shown that such significant decrease in the permeability in time can be caused by clogging of the sample pore space. The additional experiment with sequential pumping of single-phase gas and liquid through the sample showed that the gas contained in the flow of liquid can act as a dispersed phase that clogs pores. The estimations show that even very low particle concentrations at large time periods lead to significant decrease in the permeability. The possibility of clogging of core sample pore space must be considered when conducting long-term experiments on study of the permeability by the steady-state method.
KeywordsPermeability Clogging Steady-state flow method Long-term Experimental study
The work was supported by the state task (project No. 0146-2019-0007).
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