A Study on Transient Fluid Flow of Horizontal Wells in Dual-Permeability Media

Wang, Xiao Dong; Zhou, Yingfang; Luo, Wan

doi:10.1016/s1001-6058(09)60026-3

Cited by 15 publications

(8 citation statements)

References 8 publications

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“…Liu et al first proposed the exact solution of a single-phase DPDP model with consideration of wellbore storage and skin effect [4,5]. After that, several analytical solutions [6][7][8][9][10][11] for the DPDP single-phase well test model were derived with different well and formation conditions. Guo et al [12] proposed a triple-porosity and dualpermeability pressure transient model for a horizontal well in fractured-vuggy carbonate reservoirs.…”

Section: Introductionmentioning

confidence: 99%

A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

Zhan

et al. 2021

Geofluids

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The pressure transient behavior of water injection well has been extensively investigated under single-phase flow conditions. However, when water is injected into formation, there are saturation gradients within the water flooded area. Additionally, water imbibition is essentially important for oil displacement in dual-porosity and dual-permeability (DPDP) reservoirs. In this work, a novel semianalytical two-phase flow DPDP well test model considering both saturation gradient and water imbibition has been developed. The model was solved by the Laplace transform finite difference method. Type curves were generated, and flow regimes were identified by the model. The model features and effect of parameters were analyzed. Results show that water imbibition reduces the advancing speed of water drive front in the fracture system and slows down the water cut raising rate and the expansion speed of the two-phase zone in the fracture system. Therefore, the fluid exchange between the fracture and matrix systems becomes more sufficient and more oil will be recovered from the DPDP reservoir. The shape of pressure curves is similar for the single-phase and two-phase flow DPDP model, but the position of the proposed model is above the curves of the single-phase model. Shape factor mainly influences the interporosity period of the pressure derivatives. Water imbibition has a major effect on the whole system radial flow period of the curves. The findings of this study can help for better understanding of the oil/water two-phase flow pressure transient behavior in DPDP reservoirs considering saturation gradients and water imbibition.

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Section: Introductionmentioning

confidence: 99%

A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

Zhan

et al. 2021

Geofluids

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“…Practically, the permeability of matrix system is negligible while the cleat system is the primary migration channel of coalbed methane (Dong et al 2019). Stress-induced permeability changes in conventional rocks have been in-depth investigated previously (Wang et al 2010(Wang et al , 2012. However, permeability dynamics exhibit unique different characteristics in coals due to gas adsorption/desorption phenomenon.…”

Section: Introductionmentioning

confidence: 99%

A new desorption-induced permeability dynamic model and its application in primary coalbed methane recovery

Zhang

et al. 2021

J Petrol Explor Prod Technol

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In the process of dewatering and recovery of coalbed methane, coal permeability exhibits a quite unique feature due to the interference of matrix shrinkage and stress effects. A new theoretical dynamic model was proposed for coal permeability based on the assumptions of matchstick geometry of the coal and uniaxial strain condition. Distinct from previous models such as P&M and S&D models, our model relates the gas-sorption-reduced strain to the change of surface energy of coal solids. One of the advantages of this model is that it does not require the sorption-reduced strain as an essential input, and therefore eliminates the related laborious and expensive laboratory measurement. The model was validated by fitting it to two sets of public data and shows an excellent match with the observed data. The results also indicate that our model has a better performance in predicting the permeability dynamics than P&M and S&D models. Additionally, a sensitivity analysis of the effect of input parameters on permeability dynamics was conducted by gray-relation theory, and the initial porosity and reservoir temperature are demonstrated to exert a most distinguished effect on the permeability dynamics. Finally, the proposed model was incorporated into a numerical simulator and successfully applied to conduct a history match of the gas and water production rate in a developed territory.

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“…For composite reservoirs with faults, Rahman et al proposed a model to describe the flow conditions of nearby wells [32]. Wang et al used the method of sink source superposition and integral transformation to solve the solution of the new model of multiple permeability of composite reservoir, and studied the influence of different parameters and various boundaries on downhole pressure [33]. Imad et al proposed a new model of horizontal well dual-porosity composite reservoir and studied its pressure characteristics [34].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pressure and Production Transient Characteristics of Composite Reservoir with Moving Boundary

et al. 2019

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The mathematical model of composite reservoir has been widely used in well test analysis. In the process of oil recovery, due to the injection or replacement of the displacement agent, the model boundary can be moved. At present, the mathematical model of a composite reservoir with a moving boundary is less frequently studied and cannot meet industrial demand. In this paper, a mathematical model of a composite reservoir with a moving boundary is developed, with consideration of wellbore storage and skin effects. The characteristics of pressure transient in moving boundary composite reservoir are studied, and the influences of parameters, such as initial boundary radius, moving boundary velocity, skin factor, wellbore storage coefficient, diffusion coefficient ratio, and mobility ratio on pressure and production, are analyzed. The moving boundary effects are noticeable mainly in the middle and late production stages. The proposed model provides a novel theoretical basis for well test analysis in these types of reservoirs.

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A Study on Transient Fluid Flow of Horizontal Wells in Dual-Permeability Media

Cited by 15 publications

References 8 publications

A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

A new desorption-induced permeability dynamic model and its application in primary coalbed methane recovery

Analysis of Pressure and Production Transient Characteristics of Composite Reservoir with Moving Boundary

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