TY - GEN
T1 - Potential techniques for production of natural gas from hydrate reservoirs
AU - Patil, S. L.
AU - Nanchary, N. R.
PY - 2005
Y1 - 2005
N2 - Gas hydrates are a vast storehouse of natural gas and significant technical issues need to be resolved before this enormous resource can be considered an economically producible reserve. Developments in numerical simulations give useful information in predicting the technical and economic analysis of hydrate-dissociation process. For this reason we have adapted a commercial simulator, CMG STARS, to model gas hydrate dissociation caused by several production mechanisms (depressurization, hot water injection and steam injection). Even though CMG is a commercially available simulator and that too only capable of handling thermal oil recovery processes, it is the novel approach of our work by which the simulator was modified by formulating kinetic and thermodynamic model to describe the hydrate decomposition. This paper introduces the theoretical background of our simulator and presents the assessment of several gas production schemes done by using this simulator. The simulator can calculate gas and water production rate from well, and the profiles of pressure, temperature and saturation distributions in the formation for various operating conditions. Results indicate that the significant amount of gas can be produced from a hypothetical hydrate formation overlying a free gas accumulation by different production scenarios. However, steam injection remarkably improved gas productivity over depressurization and hot water injection. Effect on gas production by the presence of aquifer in the formation is also studied. Various cases were run with variations in absolute permeability, rock thermal conductivity and kinetic rate constant.
AB - Gas hydrates are a vast storehouse of natural gas and significant technical issues need to be resolved before this enormous resource can be considered an economically producible reserve. Developments in numerical simulations give useful information in predicting the technical and economic analysis of hydrate-dissociation process. For this reason we have adapted a commercial simulator, CMG STARS, to model gas hydrate dissociation caused by several production mechanisms (depressurization, hot water injection and steam injection). Even though CMG is a commercially available simulator and that too only capable of handling thermal oil recovery processes, it is the novel approach of our work by which the simulator was modified by formulating kinetic and thermodynamic model to describe the hydrate decomposition. This paper introduces the theoretical background of our simulator and presents the assessment of several gas production schemes done by using this simulator. The simulator can calculate gas and water production rate from well, and the profiles of pressure, temperature and saturation distributions in the formation for various operating conditions. Results indicate that the significant amount of gas can be produced from a hypothetical hydrate formation overlying a free gas accumulation by different production scenarios. However, steam injection remarkably improved gas productivity over depressurization and hot water injection. Effect on gas production by the presence of aquifer in the formation is also studied. Various cases were run with variations in absolute permeability, rock thermal conductivity and kinetic rate constant.
UR - https://www.scopus.com/pages/publications/84856859313
U2 - 10.1201/9781439833407.ch19
DO - 10.1201/9781439833407.ch19
M3 - Conference contribution
AN - SCOPUS:84856859313
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 - 143
EP - 152
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 -