Analysis Models for the Unconventional Gas Reservoirs: Hydrate-capped Gas Reservoirs and Dry CBM Reservoirs

Regardless of the technological challenges for exploitation of unconventional gas reservoirs, the mathematical modeling of such reservoirs is challenging due to complex physical processes which are involved over the course of reservoir depletion. The purpose of this book is to present the development of models for prediction of reservoir performance using analytical approach for two particular types of unconventional gas reservoirs consisting (1)hydrate-capped gas reservoirs, and (2)dry CBM reservoirs. In particular, the boundary dominated and transient flow models for gas production from a hydrate-capped gas reservoir, as well as a production model for analysis of a dry CBM reservoir are presented. The models presented here can be easily programmed on spreadsheet and can be used as an engineering tool for evaluating the role of hydrates and adsorbed gas in improving the productivity and extending life of hydrate-capped gas reservoirs and dry CBM reservoirs, respectively.