Timothy S. Collett M. Pooladi-Darvish S. Hancock C. Santamarina R. Boswel T. Kneafsey J. Rutqvist M. B. Kowalsky M. T. Reagan E. D. Sloan A. K. Sum C. A. Koh G. J. Moridis 2011 <p><span>The current paper complements the&nbsp;</span><a class="link link-ref link-reveal xref-bibr" data-open="R141">Moridis et al. (2009)</a><span>&nbsp;review of the status of the effort toward commercial gas production from hydrates. We aim to describe the concept of the gas-hydrate (GH) petroleum system; to discuss advances, requirements, and suggested practices in GH prospecting and GH deposit characterization; and to review the associated technical, economic, and environmental challenges and uncertainties, which include the following: accurate assessment of producible fractions of the GH resource; development of methods for identifying suitable production targets; sampling of hydrate-bearing sediments (HBS) and sample analysis; analysis and interpretation of geophysical surveys of GH reservoirs; well-testing methods; interpretation of well-testing results; geomechanical and reservoir/well stability concerns; well design, operation, and installation; field operations and extending production beyond sand-dominated GH reservoirs; monitoring production and geomechanical stability; laboratory investigations; fundamental knowledge of hydrate behavior; the economics of commercial gas production from hydrates; and associated environmental concerns.</span></p> application/pdf 10.2118/131792-PA en Society of Petroleum Engineers Challenges, uncertainties, and issues facing gas production from gas-hydrate deposits article