DISSOCIATION OF HYDRATED MARINE SEDIMENT

Mohamed Iqbal Pallipurath

Аннотация


Modelling of hydrate dissociation in a sediment bed is needed to understand the gas evolution characteristics. This will determine temperature profiles in the sediment bed at different times and also the rate of propagation of the dissociation front. The model would consider the subsidence of sediment bed during and after hydrate dissociation. Sediment collapse would affect the gas recovery from hydrated sediments and an understanding of the process is thus crucial to cost effective gas extraction from hydrate. The model gives us a picture of the collapse process in time. Sediment subsidence curves show that subsidence is a strong function of void ratio and compression index of the sediment. Lower void ratios resulted in almost linear dependence of subsidence on time, whereas higher void ratios produced a curvature in the plot. The effect was similar with lower compression indices producing gradual subsidence and higher values resulting in exponential curves. Total settlement plots illustrated a linear behaviour of settlement with time at low values of shear stress change. Larger values of both compression index and shear stress change caused markedly non linear relationship with time. Increasing iterations (in effect increasing the time of settlement) found settlements to taper off. The settlement curve obtained by the model was compared to the actual settlement curves of marine sediment under compression. It was found that when the model was set to the overburden pressure and other parameters of the experimental results, the prediction of settlement was acceptably close. The model will allow optimization of gas recovery efforts from hydrated sediments.

Полный текст:

PDF

Литература


>1. Dimo Kashchiev, Abbas Firoozabadi. Nucleation of gas hydrates. Journal of Crystal Growth 243 (2002), 476–489.

2. Kvenvolden, K. A. (1988), Methane Hydrate; A Major Reservoir Of Carbon In The Shallow Geosphere?, Chemical Geology, 71, 41–51.

3. Sultan N., Cochonat P., Foucher J.-P., Mienert J., Effect of Gas Hydrates Melting On Seafloor Slope Instability, Marine Geology 213 (2004), 379– 401

4. Gudmundsson J S., Andersson V., Levik O. I. and Parlaktuna M. Hydrate concept for capturing associated gas. 1998 SPE european petroleum conference the hague, the netherlands, 20-22 october 1998.

5. Eric M. Yezdimer, Peter T. Cummings, and Ariel A. Chialvo Determination of the Gibbs Free Energy of Gas Replacement in SI Clathrate Hydrates by Molecular Simulation.

6. Yuehong Bi, Tingwei Guo, Tingying Zhu, Shuanshi Fan, Deqing Liang, Liang Zhang Influence of volumetric-flow rate in the crystallizer on the gas-hydrate cool storage process in a new gas-hydrate cool-storage system.

7. Rahim Masoudi, Bahman Tohidi, Ali Danesh, Adrian C. Todd A new approach in modelling phase equilibria and gas solubility in electrolyte solutions and its applications to gas hydrates.

8. Kelkar S.K., Selim M.S., Sloan E.D., Hydrate Dissociation Rates In Pipelines, Fluid Phase Equilibria 150–151Ž1998.371–382.

9. Kvenvolden, K. A. (1999), Potential effects of gas hydrate on human welfare, in Papers from a National Academy of Sciences colloquium on Geology, mineralogy, and human welfare, vol. 96; 7, pp. 3420–3426, National Academy of Sciences, Washington, DC, United States.

10. Kollé J.J. and Max M.D., Seafloor drilling of the hydrate economic zone for exploration and production of methane, © Tempress Technologies, Inc. (2000).

11. Erik M. Freer, M. Sami Selim1, E. Dendy Sloan Jr. Methane hydrate film growth kinetics Fluid Phase Equilibria 185 (2001), 65–75.

12. Y. S. Kim, S. K. Ryu, S. O. Yang, and C. S. Lee Liquid Water-Hydrate Equilibrium Measurements and Unified Predictions of Hydrate-Containing Phase Equilibria for Methane, Ethane, Propane, and Their Mixtures.

13. Kal Seshadri, Joseph W. Wilder,, and Duane H. Smith Measurements of Equilibrium Pressures and Temperatures for Propane Hydrate in Silica Gels with Different Pore-Size Distributions.

14. Eric M. Yezdimer, Peter T. Cummings, and Ariel A. Chialvo Determination of the Gibbs Free Energy of Gas Replacement in SI Clathrate Hydrates by Molecular Simulation.

15. George G. Tsypkin Mathematical Models Of Gas Hydrates Dissociation In Porous Media (Unpublished work).

16. Jeffery B. Klauda and Stanley I. Sandler. Modeling Gas Hydrate Phase Equilibria in Laboratory and Natural Porous Media. Ind. Eng. Chem. Res. 2001, 40, 4197-4208.

17. Goodarz Ahmadi, Chuang Ji, Duane H. Smith Numerical solution for natural gas production from methane hydrate dissociation Journal of Petroleum Science and Engineering 41 (2004) 269– 285.

18. Naval Goel, Michael Wiggins, Subhash Shah Analytical modeling of gas recovery from in situ hydrates dissociation Journal of Petroleum Science and Engineering 29 (2001), 115–127.

19. Kelkar S.K., Selim M.S., Sloan E.D., Hydrate Dissociation Rates In Pipelines, Fluid Phase Equilibria 150–151Ž1998.371–382.

20. Yousif. M. H, Abass. H. H., Selim. M. S. and Sloan. E. D., Experimental and Theoretical Investigation of Methane Gas Hydrate Dissociation in Porous Media. SPE Res. Eng., 69-76, 1991.

21. Ji C., Ahmadi G., Smith D. H., Constant Rate Natural Gas Production From A Well In A Hydrate Reservoir, Energy Conversion and Management 44 (2003), 2403–2423.

22. Inderbitzen A. L. (Ed.) Deep sea sediments Physical and mechanical properties, Plenum press, New York and London, 1974.

23. Aziz K. and Durlofsky L., Notes on Reservoir Simulation, Stanford University, Petroleum Engineering, August 2004, Personal communication.

24. Fredlund D. G. and Rahardjo H., Soil mechanics for unsaturated soils, J Wiley, 1993.


Ссылки

  • На текущий момент ссылки отсутствуют.