A semi-analytical solution for multiple-trilinear-flow model with asymmetry configuration in multifractured horizontal well.

Trilinear-flow model presented by Brown in 2009 are commonly used to simulate the pressure-transient and production behaviors of multiple fractured horizontal wells (MFHW) in unconventional reservoirs. Brown's model was established on the symmetry hypothesis of MFHW, i.e., single-fracture-based configuration. The principle focus of this work is on proposing a novel semi-analytical solution to fill the gap between trilinear-flow model on the symmetry hypothesis of MFHW and actual asymmetry multi-fractured configuration. The new solution is generated by incorporating the principle of pressure superposition, which could take the effect of fracture-production interaction and property heterogeneity of fractures into account. The results obtained from new solution are also validated by comparing with numerical simulation in two specific cases: identical properties of fractures in the unequally-spaced configuration and different properties of fractures in the equally-spaced configuration. Meanwhile, this paper provides approximated relationships to associate existing single-fracture-based solution with our multi-fractures-based solution. A synthetic sample is also presented to illustrate the improvement of new solution towards pressure transient analysis. The proposed model could provide a practical alternative to the solutions for MFHW model based on Green's function method, and also extend existing multilinear-flow (e.g., enhanced five-region model) and multi-porosity model (e.g., dual/triple porosity and adsorption effect) to multiple-fractured configuration. [ABSTRACT FROM AUTHOR]

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