Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

The primary focus of this study is the development of a long-term interference pumping test model using boundary element method(BEM) for a geometrically complex aquifer. The pressure distribution and the pressure derivative curves from this model are utilized to discriminate the transient state and pseudo-steady state of testing data. The solution of the model is free from numerical dispersion and grid orientation effect as well, which make it close to the analytical solution. Implementing the free space Green\\\'s function as a weighting function, this model can handle multiple sources in a reservoir with complex geometry. The proposed model has been validated for a simple geometrical system(square) whose solution can be obtained by the image well technique. The results of matches are found to be excellent. In order to examine the applicability of the model, pressure distribution analysis as well as pressure derivative curve analysis were adopted to clearly distinguish the transient and pseudo-steady flowing period of the data produced from the geometrically complex aquifer, and each flowing period data are analyzed respectively.