Simulation of Paleogene gas-hydrate deposit development at the North of Western Siberia

UDK: 622.245.1a

Key words: gas-hydrate deposit, Paleogene deposits, Western Siberia, development simulation

Authors: K.S. Basniev, A.A. Nekrasov, F.A. Adzynova, V.S. Yakushev (Gubkin Russian State University of Oil and Gas (National Research University), RF, Moscow)

The possibility of long-time development of Paleogene gas-hydrate deposit located at the North of Western Siberia at depths 300-600 m is considered in the paper. Known data on lithology and geologic structure of Paleogene sediments are introduced to the model of the deposit. Rock properties were taken from experimental data on gas hydrate saturation of similar deposits. Development simulation was made using ECLIPSE 300 software. Following approximations have been accepted: the deposit is developed by depressurization method and bottomhole depressions do not allow the deposit leave thermodynamic field of gas hydrate stability. I.e. the deposit is developed as low-temperature gas deposit. Simulation results have shown, that about 220 production wells are needed for deposit of 30 x 30 km size and 10-100 m in thickness. Medium gas flowrate is about 18 000 m3/day. About 150 x 10⁹ m³ of gas will be produced from the deposit during 100 years (17% of gas reserves or 3,3% of total gas reserves). The deposit will stay thermodynamically in the field of gas hydrate stability. Gas production technology change for example redirection of produced gas downhole – to the already exhausted Cenomanian natural gas deposit using old Cenomanian gas production wells, can considerably change deposit exhaustion regime through gas flowrate increase. The deposit development simulation has shown, that at the North of West Siberia there is the possibility of use of new gas reserves and additional deposits energy for uploading of Cenomanian gas production facilities.
References
1. Yakushev V.S., Basniev K.S., Adzynova F.A., Indications of regionally spread
gas-bearing horizon of new type at the north of Western Siberia (In Russ.),
Neftyanoe khozyaystvo = Oil Industry, 2014, no. 11, pp. 100-101.
2. Stroganov L.V., Skorobogatov V.A., Gazy i nefti ranney generatsii Zapadnoy
Sibiri (Earlier generation gas and oil of Western Siberia), Moscow: Nedra Publ.,
2004, 415 p.
3. Chuvilin E.M., Grebenkin S.I., Experimental estimation of gas permeability of
gas-saturated sediments during hydrate formation and freezing (In Russ.),
Kriosfera Zemli, 2015, no. 2, pp. 67-74.
4. Basniev K.S., Kul'chitskiy V.V., Shchebetov A.V., Nifantov A.V., Methods for
the gas hydrate deposits development (In Russ.), Gazovaya promyshlennost'
= GAS Industry of Russia, 2006, no. 7, pp. 22-24.
5. Istomin V.A., Nesterov A.N., Chuvilin E.M., Decomposition of hydrates of different
gases at temperatures below 273 K (In Russ.), Gazokhimiya, 2008, no. 3,
pp. 30-44.