A new production predicting model of fractured horizontal wells in dual-porosity gas reservoirs on non-Darcy flow conditions

Experimental Investigation of Forchheimer Coefficients for Non-Darcy Flow in Conglomerate-Confined Aquifer

“…Compared to multimixture studies focusing on binary mixtures [63,64] and ternary mixtures [68] owning properties similar to the CCA media and investigations that focused on the changes in the porosity and permeability caused by the components of porous media, in this study, we experimentally determined the Forchheimer coefficients and obtained seepage characteristics of the CCA. In detail, seepage behavior and associated characteristic of the CCA were studied using the Forchheimer law under different hydrogeologyical conditions; empirical models of the CCA characterized by the models of intrinsic permeability (k), inertial resistance (β), and seepage discharge were developed, and the validities were confirmed through experimental 16 Geofluids and field measurement data; the aggregate grain and filling material of the CCA had positive and negative effects on the interconnected channels, respectively, accompanied by wedging and wall effects; and the transportation effect and broken effect occurred for the lower and higher in situ stress situations and contributed to the shrinkage of the interconnected pores. However, this study was limited by the laboratory-based evaluation of a one-dimensional isotropic porous media, a steady flow, and the change moment of the stress was limited to zero hydraulic gradient.…”

“…The seepage response widely exists in the study of gases, liquids, and geothermal activities [1][2][3][4][5][6][7][8]. The theories of Darcy flow and non-Darcy flow [9][10][11][12][13], which describe the relationship between the discharge and the hydraulic gradient, are widely used to investigate seepage behaviors in various fields, such as hydrocarbon resource mining of coal, coalbed methane, shale gas, tight sandstone gas [14][15][16][17][18][19], tunnel excavation, slope reinforcement, and underground mining [20][21][22][23][24][25], and also in the fields of garbage disposal, nuclear waste treatment, and sewage control [26]. Therefore, implications from investigating the seepage behavior and corresponding characteristics can greatly contribute to the development of geological science, energy mining, and the prevention and control of geological disasters.…”

Research on Segmentation Methods of Horizontal Wells

“…The idea of segmentation optimization of horizontal wells began with variable density perforation optimization [4][5]. It is found that by changing the perforation parameters along the wellbore, that is, high permeability with few perforations and low permeability with many perforations, the inflow performance of a horizontal well can be effectively balanced and the influence of reservoir heterogeneity on inflow profile can be reduced.…”