A new semi-analytical flow model for multi-branch well testing in natural gas hydrates

This paper presents a new semi-analytical solution and the related methodology to analyze pressure behavior of multi-branch wells produced from natural gas hydrates. For constant bottom-hole production, transient flow is obtained by Laplace transforms. The interference among various branches investigated using superposition principle. A simplified form proposed model validated published analytical solutions. complete profile can be divided into nine distinct regimes: wellbore storage skin, vertical radial flow, linear pseudo-radial composite dissociated transitional improvement stress-sensitive flow. well’s structure governs regimes. In our model, dynamic interface divides hydrates deposit non-dissociated regions. Natural formation properties govern compositeeffect, dissociated, transitional, dissociation coefficient difference in resistance between dissociated-zone radius affects timing these Conversion becomes instantaneous as increases. derivative exhibits same features homogeneous formation. parameter values Shenhu area South China Sea cause prominent regime conceal later Due maximum practical well-test duration limitation, first five regimes (through flow) are more likely appear practice than Cited as: Chu, H., Zhang, J., L., Ma, T, Gao Y., Lee, W. J. for well testing Advances Geo-Energy Research, 2023, 7(3): 176-188. https://doi.org/10.46690/ager.2023.03.04