Impact of permeability heterogeneity on production characteristics in water-bearing tight gas reservoirs with threshold pressure gradient

Song, Haoran; Cao, Yang; Yu, Mao-Hong; Wang, Yuhe; Killough, John; Leung, Juliana Y.

doi:10.1016/j.jngse.2014.11.028

Cited by 62 publications

(30 citation statements)

References 15 publications

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“…In this way, the flow pathways open and close episodically, resulted in fluctuation of gas flux during the gas migration process. Obviously, this stressinduced fluctuation could not be explained only using the capillary pressure proposed by Wang (2006), Yu et al (2012) and Song et al (2015).…”

Section: Test Results and Analysismentioning

confidence: 92%

“…This phenomenon could be explained using the conventional two-phase flow theory (Wang, 2006;Yu et al, 2012 andSong et al, 2015). Under relatively lower gas injection pressures, gas only exists in trapped and separated bubbles due to the significant boundary layer effects and the capillary effects in dense materials.…”

Section: Test Results and Analysismentioning

confidence: 99%

“…In low permeability materials, for low gas injection pressure, almost no gas outflow can be detected due to the significant boundary layer effects and the interfacial tension, while as the gas injection pressure increases to a relatively high (critical) value, a sudden increase of gas outflow might be recorded, which is widely termed as the gas breakthrough (Gallé, 2000;Wang, 2006;Popp et al, 2007;Yu et al, 2012;Vishal et al, 2013a;Gerard et al, 2014;Song et al, 2015). This phenomenon could be explained using the gas entry pressure, P entry , as shown in the water retention curve (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on gas migration in saturated materials with low permeability

et al. 2015

Engineering Geology

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International audienceInvestigation of the hydro-mechanical effects on gas migration in saturated materials with low permeabilityis of great theoretical and practical significances in many engineering fields. The conventional two-phaseflow (visco-capillary flow) theory, which regards the capillary pressure as the only controlling factor in gasmigration processes, is commonly adopted to describe the gas flow in geo-materials. However, formaterialswith lowpermeability, the conventional two-phase flow theory cannot properly describe the gasmigration.In this work, hydro-mechanical coupled gas injection tests were conducted. The volumetric variation of theliquid for applying the confining pressure in the specimen cell and the gas flow rate were monitored. Testresults indicate that gas migration is influenced by the capillary pressure and the mechanical stress simultaneously.The two key parameters of the gas entry pressure Pentry and the gas induced-dilatancy pressurePdilatancy are introduced for description of gas migration with respect to the capillary pressure and the mechanicalstress effects, respectively. When the gas injection pressure is smaller than the Pentry and thePdilatancy, the balance between the gas injection pressure and the confining pressure will lead to an intermittentgas flow. Sudden increase of gas flow rate could be observed once the gas injection pressure approachesthe Pentry or the Pdilatancy. For higher gas injection pressures, the mechanical stress effects on gas migrationcould not be neglected. The sudden increase of gas flux under high gas injection pressures could be causedby the mechanical induced-dilatancy of channels, capillary pressure induced-continuous flow pathways, aswell as the failure of sealing-efficiency. The failure of sealing-efficiency is closely related to the differencebetween the gas injection pressure and the confining pressure rather than the properties of the materialtested. Monitoring the volume of liquid for applying confining pressure is helpful for detecting the failureof sealing efficiency and the mechanism of gas breakthrough

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Section: Test Results and Analysismentioning

confidence: 92%

Section: Test Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on gas migration in saturated materials with low permeability

et al. 2015

Engineering Geology

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“…Modeling and simulation of compositional flow in subsurface media are prevalent and of interest in hydrogeology and hydrocarbon reservoirs (cf. [8,28,29,20,37,36,18,26,27,40,31,32,33,34] and references therein). Mathematical model of multicomponent compressible flow in porous media includes the Darcy's law, the conservation of mass and the equation of state, which is a coupled nonlinear system.…”

Section: Introductionmentioning

confidence: 99%

A fully mass-conservative iterative IMPEC method for multicomponent compressible flow in porous media

Chen

Fan

Sun

2019

Journal of Computational and Applied Mathematics

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In this paper we consider efficient and fully mass-conservative numerical methods for the multicomponent compressible single-phase Darcy flow in porous media. Compared with the classical IMplicit Pressure Explicit Concentration (IMPEC) scheme by which one of the components may be not massconservative, the new scheme enjoys an appealing feature that the conservation of mass is retained for each of the components. The pressure-velocity system is obtained by the summation of the discrete conservation equation for each component multiplying an unknown parameter which is nonlinearly dependent of the molar concentrations. This approach is quite different from the conventional method which is used in the classical IMPEC scheme. We utilize a fully mass-conservative iterative IMPEC method to solve the nonlinear system for molar concentration, pressure and velocity fields. The upwind mixed finite element methods are used to solve the pressure-velocity system. Although the Peng-Robinson equation of state (EOS) is utilized to describe the pressure as a function of the molar concentrations, our method is suitable for any type of EOS. Under some reasonable conditions, the iterative scheme can be proved to be convergent, and the molar concentration of each component is positivity-preserving. Several interesting examples of multicomponent compressible flow in porous media are presented to demonstrate the robustness of the new algorithm.2010 Mathematics Subject Classification. 65N30, 49S05. Key words and phrases. Multicomponent compressible flow, Peng-Robinson equation of state, upwind mixed finite element methods, fully mass-conservative iterative IMPEC method.

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“…In addition, for tight carbonate reservoirs, dual-porosity and triple-porosity models with a moving boundary have been developed [25][26][27][28][29][30][31][32]. Numerical methods, such as the finite difference method [33][34][35][36], also provide a powerful tool to calculate moving boundary problems. A nonlinear seepage numerical simulation software has been developed to study oil and water two-phase flow in low permeability [37,38].…”

Section: Introductionmentioning

confidence: 99%

Analytical Solutions for Non‐Darcy Transient Flow with the Threshold Pressure Gradient in Multiple‐Porosity Media

Luo

Xiao-dong

et al. 2019

Mathematical Problems in Engineering

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Low-velocity non-Darcy flow can be described by using the threshold pressure gradient (TPG) in low-permeability porous media. The existence of the TPG yields a moving boundary so that fluid starts to flow inside this boundary when the pressure gradient overcomes the viscous forces, and beyond this boundary, there will be no flow. A mathematical model of considering the TPG is developed to describe the flow mechanism in multiple-porosity media. By defining new dimensionless variables, the nonlinear mathematical model can be solved analytically. This new approach has been validated with several approximate formulas and numerical tools. The diffusion of the moving boundary varying with time is analyzed in detail in multiple-porosity media, and then the effect of the moving boundary on pressure transient response is investigated and compared with that of the traditional three boundary types (closed boundary, infinite-pressure boundary, and constant-pressure boundary). Sensitivity analysis is conducted to study the effect of the TPG on pressure and pressure derivative curves and rate decline curves for single-porosity media, dual-porosity media, and triple-porosity media, respectively. The results show that the moving boundary exerts a significant influence on reservoir performance at a relatively early time, unlike the other three boundary types, and only a boundary-dominated effect at the late time. The larger the threshold pressure gradient, the smaller the diffusion distance of the moving boundary and the rate of this well at a given dimensionless time. At the same time, the pressure transient response exhibits a higher upward trend because of a larger TPG. All behavior response might be explained by more pressure drop consumed in low-permeability reservoirs. The finding is helpful to understand the performance of low-permeability multiple-porosity media and guide the reasonable development of low-permeability reservoirs.

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Impact of permeability heterogeneity on production characteristics in water-bearing tight gas reservoirs with threshold pressure gradient

Cited by 62 publications

References 15 publications

Investigation on gas migration in saturated materials with low permeability

Investigation on gas migration in saturated materials with low permeability

A fully mass-conservative iterative IMPEC method for multicomponent compressible flow in porous media

Analytical Solutions for Non‐Darcy Transient Flow with the Threshold Pressure Gradient in Multiple‐Porosity Media

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