Research on Numerical Simulation of Dynamic Pressure for Stress Sensibility Coal Seam

Abstract:

Based on the orthotropic physical properties of coal cleats, the fluid-solid coupling model for stress sensibility coal seams is established. The equations of the coupling model are solved by using the finite element method. The history matching for JS-3 well in Ordos basin is carried on by using the coupling model. The comparison between calculated results based on the coupling model and the measured values indicates their good agreement, which verifies the accuracy and rationality of the model. The effect of the permeability orthotropic coefficient of coal cleats on the pressure distribution in coal seams is analyzed. The results show that the pressure along the butt cleats direction increases with permeability orthotropic coefficient increasing; The pressure along the face cleats decreases with permeability orthotropic coefficient increasing between 0m~30m and 170m~200m, whereas both increases from 30m to 170m.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 2293-2299
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.2293
• Online since: November 2011
• Authors: Yun Hong Ding, Bao Hui Wang, Xiang Zhen Yan
• Keywords: Coal Cleat, Coupling, Finite Element Method (FEM), Ordos, Stress Sensibility

References

[1] Jishan Liu , Zhongwei Chen, Derek Elsworth, et al . Linking gas-sorption induced changes in coal permeability to directional strains through a modulus reduction ratio, . International Journal of Coal Geology, vol. 1, pp.21-30, March (2010).

DOI: 10.1016/j.coal.2010.04.006

[2] LI. Huoyin, Shimada. Sohei, Zhang. Ming, Anisotropy of gas permeability associated with cleat pattern in a coal seam of the Kushiro coalfield in Japan, Enviromental Geology, vol. 47, pp.45-50, October (2005).

DOI: 10.1007/s00254-004-1125-x

[3] T. Gentzis,F. Goodarzi F.K. Cheung,F. Laggoun-Défarge. Coalbed Methane producibility from the Mannville coals in Alberta, Canada: a comparison of two areas,. International Journal of Coal Geology, vol. 74, pp.237-249, January (2008).

DOI: 10.1016/j.coal.2008.01.004

[4] S.E. Laubach R.A. Marrett J.E. Olson A.R. Scott. Characteristics and origins of coal cleat: A review, . International Journal of Coal Geology, vol. 35, pp.175-207, December (1998).

DOI: 10.1016/s0166-5162(97)00012-8

[5] G.X. Wang,P. Massarotto and V. Rudolph. An improved permeability model of coal for coalbed methane recovery and CO2 geosequestration ,. International Journal of Coal Geology, vol. 77, pp.127-136, May (2008).

DOI: 10.1016/j.coal.2008.10.007

[6] Zhang Shengli. Coalbed cleat and its significance in exploration and development of coalbed methane . Coal Geology of China, vol. 23, pp.27-30, August (1995).

[7] Wicks D.E., Schewerer F.C., Militzer M.R., and Zuber. M.D., Effective Production Strategies for Coalbed Methane in the Warrior Basin, Unconventional Gas Technology Symposium, pp.65-84, May (1986).

DOI: 10.2118/15234-ms

[8] ZHANG Yi, YAN Xiang-zhen and YAN Qing-zhi, 3D Model for the Stratified Calculation of Ground Stress and Fracture Criterion of Wellhole Rock, Journal of Xi, an Petroleum Institute (Natural Science Edition), vol. 15, pp.42-43, April (2000).

[9] Hoek E and Brown E T, Practical estimates of rock mass strength, Int. J. Rock Mech. Min. Sci, vol. 34, pp.1165-1186, August (1998).

DOI: 10.1016/s1365-1609(97)80069-x

[10] Irina Kalashnikova, Charbel Farhat and Radek Tezaur, A discontinuous enrichment method for the finite element solution of high Péclet advection-diffusion problems, Finite Elements in Analysis and Design, vol. 45, pp.238-250, March (2009).

DOI: 10.1016/j.finel.2008.10.009

[11] Robert Gracie and James R. Craig, Modelling well leakage in multilayer aquifer systems using the extended finite element method, Finite Elements in Analysis and Design, vol. 46, pp.504-513, June (2010).

DOI: 10.1016/j.finel.2010.01.006

[12] H.H. Zhang and L.X. Li, Modeling inclusion problems in viscoelastic materials with the extended finite element method, Finite Elements in Analysis and Design, vol. 45, pp.721-729, August (2009).

DOI: 10.1016/j.finel.2009.06.006

[13] H.H. Zhang and L.X. Li, Modeling inclusion problems in viscoelastic materials with the extended finite element method, Finite Elements in Analysis and Design, vol. 45, pp.721-729, August (2009).

DOI: 10.1016/j.finel.2009.06.006

[14] A. Kaveh and K. Koohestani, Efficient finite element analysis by graph-theoretical force method; triangular and rectangular plate bending elements, Finite Elements in Analysis and Design, vol. 44, pp.646-654, June (2008).

DOI: 10.1016/j.finel.2008.03.001