Analysis of slug interference tests conducted in an artificial fracture
Tóm tắt
A laboratory analogue experiment platform with an artificial fracture was built to analyze the effect of slug interference tests on the evaluation of the hydraulic properties of fractured rocks. The response of an aquifer to a slug source well was analyzed using type-curve comparisons under the condition of different radial constant-water-head boundaries. The injecting-water, releasing-water, and pneumatic laboratory experiments of the slug interference tests were conducted in an artificial fracture. The relationship between the critical distance of the radial constant-water-head boundary and the dimensionless storage coefficient approximately followed a power function. The empirical formula provides an intuitive and effective reference criterion for considering the influence of the radial constant-water-head boundaries during field slug interference tests. When the radial constant-water-head boundary distances are less than the critical values, the boundary leads to an obvious increase in the recovery rate during the late response period, and the response peaks of the aquifer shift to an earlier time in the low-storage fractured rocks. The monitoring and analysis of the response in fractured rocks can improve the accuracy of the transmissivity and storage coefficient estimations, particularly when the slug interference tests are affected by the radial constant-water-head boundaries.
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