The Damage Theory Model on Fluid-Solid-Heat Coupling of Reservoir under Process Injection

Abstract:

Based on the study of double porous medium, the paper provides a new model of cylinder volume element plastic yielding, which assumes that the rock mass is compressible and obeys the D-P formula, and deformation, nucleation and growing of pores and fractures are induced by stress of injection pressure and temperature. The damage variable is defined by strain porosity, and then constitutional equation of double pore medium saturated liquid-solid is set up. Taking one well of Jilin Oil Field in China as a case, the damage variable, porosity and induced stress change laws of rock strain coupling with temperature-injection are studied. The results are acquired from numerical simulation of finite element software, including induced stresses of thermal field, water flood pressure, rock stress distribution rule, together with evolving regulations of stress, damage variable and strain porosity. The numerical computation results match well with the practical situation, which shows that there is obvious elastic and plastic damage characteristic during mass water flood recovery. The new model provides a new research method and theoretical base for changes of reservoir pores and fractures during water flood exploration.

• Periodical: Applied Mechanics and Materials (Volumes 29-32)
• Pages: 2053-2058
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.29-32.2053
• Online since: August 2010
• Authors: Wan Chun Zhao, Chi Ai, Da Chun Zheng
• Keywords: Double Medium, Injection-Production Relation, Temperature-Fluid-Solid Coupling

References

[1] Minner W A, Wright C A Waterflood and production induced stress changes dramatically affect hydraulic fracture behavior in lost hill infill wells[J]. SPE77536, (2002).

DOI: 10.2118/77536-ms

[2] Ran Qiquan, Li Shilun. Study on dynamic models of reservoir parameters in the coupled simulation of multiphase flow and reservoir deformation[J]. Petroleum exploration and development, 1997, 24(3): 61-65.

[3] Li Peichao; Kong Xiang yan; Lu Detang. Mathematical modeling of flow in saturated porous media on account of fluid-structure coupling effect [J]. Journal of Hydrodynamics, 2003, 18(4): 419-426.

[4] Liu Yaoru, Yang Qiang, Qin Zhenchao. Parallel numerical simulation of seepage in fractured rock mass based on statistic model[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(4): 736-742.

[5] Yang Qiang; Chen Xin; Zhou Weiyuan. Elasto-plastic damage model for geomaterials and strain localization analyses[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(21): 3577-3583.

[6] KHALILI N, LORET B. An elastoplastic model for non-isothermal analysis of flow and deformation in unsaturated porous media formulation[J]. Solids and Structures，2001， 38(46/47): 8305-8330.

DOI: 10.1016/s0020-7683(01)00081-6

[7] Chen Weizhong, Shao Jianfu, D G. Constitutive model of saturated-unsaturated clay and its numerical simulation[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(17): 3011-3016.

[8] Hu Zai-qiang, Shen Zhujiang, Xie Ding-yi. Constitutive model of structural loess[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(4)565-569.

[9] Sheng Jinchang. Fully coupled thermo-hydro-mechanical model of saturated porous media and numerical modelling[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S1): 3028-3033.