Numerical modeling of methane gas production from hydrate reservoir of Krishna Godhavari basin by depressurization

ABSTRACTNatural gas hydrates are considered as a strategic unconventional clean hydrocarbon resource in the energy sector. This paper analyzes the spatiotemporal effectiveness of the depressurization technique for producing methane gas from an unconfined Class 4 clayey setting in the Krishna Godavari (KG) basin, east coast of India. The production potential of a well by depressurization based on the borehole-based pumping technique is modeled using the newly developed spatiotemporal numerical tool, IndHyd 1.0, built using MATLAB for a constant borehole ΔP. The model is aided by TOUGH+HYDRATE reservoir production simulation software. From the IndHyd 1.0 simulation results, it is identified that a vertical well in the location NGHP-01-10D could have a lateral well reach, longevity, and a cumulative methane gas production potential of 145 m, 1.2 years, and ∼0.6 billion m3, respectively. For the formation with a postdissociation permeability of 200 mD, a possible scenario in the fractured settings, the well r...