TY - GEN
T1 - Feasibility of gas production of offshore gas hydrate deposits by integration with GTL process
AU - Patil, S. L.
AU - Nanchary, N. R.
PY - 2005
Y1 - 2005
N2 - Gas-to-liquids (GTL) conversion technology, where natural gas is chemically converted to transportable hydrocarbon liquid products, is an emerging technology that will undoubtedly reach commercialization within the next decade. GTL process is a largely exothermic process, which produces so much heat that could potentially be unused by letting the heat flow into the environment. Natural gas hydrates are a huge yet untapped source of natural gas and the process of gas hydrate destruction is endothermic one. The brine is known to have great potential of dissociating natural gas hydrates compared to other thermal methods and will minimize heat losses in the well bore and the amount of reservoir heating required for hydrate dissociation. Tapping this heat resource from the GTL process and transferring it to produce hot brine in an exchanger and utilizing the brine for hydrate dissociating is an efficient way of utilizing the thermal energy from the GTL facility to produce gas from natural gas hydrates that will form the feed for the GTL facility and also provide gas for lifting the well effluent. A heat transfer model was developed that will allow calculation of energy required for decomposition of gas hydrates, determination of hydrate and water production rates, the energy efficiency ratio (EER), and energy released from GTL plant. This model also includes well bore heat loss calculations and fractional heat losses to overburden and lowerburden during injection phase. The synergy between the gas hydrate recovery system and the GTL plant was evaluated. This model was then applied to an example hydrate offshore deposit to predict the feasibility of producing gas required for GTL conversion from hydrates by utilizing the heat required for gas hydrate decomposition from GTL plant. Through energy balance calculations, it is shown that the energy required for decomposition of gas hydrates into gas and water is approximately one tenth of the energy value of the produced gas. The energy efficiency ratio (EER) predicted by this model was 17.18.
AB - Gas-to-liquids (GTL) conversion technology, where natural gas is chemically converted to transportable hydrocarbon liquid products, is an emerging technology that will undoubtedly reach commercialization within the next decade. GTL process is a largely exothermic process, which produces so much heat that could potentially be unused by letting the heat flow into the environment. Natural gas hydrates are a huge yet untapped source of natural gas and the process of gas hydrate destruction is endothermic one. The brine is known to have great potential of dissociating natural gas hydrates compared to other thermal methods and will minimize heat losses in the well bore and the amount of reservoir heating required for hydrate dissociation. Tapping this heat resource from the GTL process and transferring it to produce hot brine in an exchanger and utilizing the brine for hydrate dissociating is an efficient way of utilizing the thermal energy from the GTL facility to produce gas from natural gas hydrates that will form the feed for the GTL facility and also provide gas for lifting the well effluent. A heat transfer model was developed that will allow calculation of energy required for decomposition of gas hydrates, determination of hydrate and water production rates, the energy efficiency ratio (EER), and energy released from GTL plant. This model also includes well bore heat loss calculations and fractional heat losses to overburden and lowerburden during injection phase. The synergy between the gas hydrate recovery system and the GTL plant was evaluated. This model was then applied to an example hydrate offshore deposit to predict the feasibility of producing gas required for GTL conversion from hydrates by utilizing the heat required for gas hydrate decomposition from GTL plant. Through energy balance calculations, it is shown that the energy required for decomposition of gas hydrates into gas and water is approximately one tenth of the energy value of the produced gas. The energy efficiency ratio (EER) predicted by this model was 17.18.
UR - https://www.scopus.com/pages/publications/84856938774
U2 - 10.1201/9781439833407.ch18
DO - 10.1201/9781439833407.ch18
M3 - Conference contribution
AN - SCOPUS:84856938774
SN - 0415374499
SN - 9780415374491
T3 - Application of Computers and Operations Research in the Mineral Industry - Proc. of the 32nd Int. Symposium on the Application of Computers and Operations Research in the Mineral Industry, APCOM 2005
SP - 133
EP - 142
BT - Application of Computers and Operations Research in the Mineral Industry - Proc. of the 32nd Int. Symposium on the Application of Computers and Operations Research in the Mineral Industry, APCOM 2005
PB - A.A. Balkema Publishers
ER -
