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Featured researches published by Ren-Shi Nie.


Transport in Porous Media | 2012

Dual Porosity and Dual Permeability Modeling of Horizontal Well in Naturally Fractured Reservoir

Ren-Shi Nie; Ying-Feng Meng; Yong-Lu Jia; Fu-Xiang Zhang; Xiang-Tong Yang; Xin-Nian Niu

This article is the first investigation on the dual permeability flow issue for horizontal well-production in a naturally fractured dual-porosity reservoir. Based on the inter-porosity flow from matrix system to fracture system and treating the media directly connected with horizontal wellbore as matrix and fracture systems, we established a model of horizontal well-production and then solved the model using some modern mathematical methods, such as Laplace integral transformation, separation of variables, eigenvalue, and eigenfunction. Later in the article, we obtained the standard log–log type curves using numerical simulation and analyzed the transient flow behavior thoroughly, which showed it is dual porosity and dual permeability flow behavior. The numerical simulation results showed that there are obvious differences between dual permeability and single permeability models. The dual permeability flow behavior accelerates energy supplement during production and reduces the classical matrix-fracture (V-shaped) response. We also showed that type curves characteristics are affected by external boundary conditions, the parameter κ, ωf and λmf, etc. The research results show that our model would be a good semi-analytical model supplied to users. Because the single permeability modeling ignores the direct fluid supply from matrix to wellbore, we recommend using the dual permeability modeling to make well testing and rate decline interpretation in real case studies.


International Journal of Computational Fluid Dynamics | 2011

New flow model for the triple media carbonate reservoir

Ren-Shi Nie; Ying-Feng Meng; Zhaozhong Yang; Jianchun Guo; Yong-Lu Jia

A new flow model in triple media carbonate reservoir is established. There exists a triple total system including the matrix, fracture and vug subsystem, and the three subsystems are relatively independent in physical properties; in the process of oil flow, the inter-porosity flow of the vug subsystem to fracture subsystem would occur and the inter-porosity flow of the matrix subsystem to fracture subsystem would also occur and ignore the inter-porosity flow between the matrix subsystem and vug subsystem. Compared with the traditional model (the inter-porosity flow of vug to fracture is pseudo-steady), the new model considers the unsteady inter-porosity flow, based on the hypothesis that the shape of vug is spherical. The new model is illustrated and solved, and the standard type curves are drawn up, so the process and characteristics of flow are analysed thoroughly, and it is found that the new-style type curves in shape and characteristics are evidently different from the type curves of traditional model. The research would not only deepen the understanding of flow law but also enrich the theoretical models for carbonate reservoir. The research results on this new model could be applied to a real case study.


Journal of Geophysics and Engineering | 2011

New modelling of transient well test and rate decline analysis for a horizontal well in a multiple-zone reservoir

Ren-Shi Nie; Jianchun Guo; Yong-Lu Jia; Shui-Qiao Zhu; Zheng Rao; Chun-Guang Zhang

The no-type curve with negative skin of a horizontal well has been found in the current research. Negative skin is very significant to transient well test and rate decline analysis. This paper first presents the negative skin problem where the type curves with negative skin of a horizontal well are oscillatory. In order to solve the problem, we propose a new model of transient well test and rate decline analysis for a horizontal well in a multiple-zone composite reservoir. A new dimensionless definition of rD is introduced in the dimensionless mathematical modelling under different boundaries. The model is solved using the Laplace transform and separation of variables techniques. In Laplace space, the solutions for both constant rate production and constant wellbore pressure production are expressed in a unified formula. We provide graphs and thorough analysis of the new standard type curves for both well test and rate decline analysis; the characteristics of type curves are the reflections of horizontal well production in a multiple-zone reservoir. An important contribution of our paper is that our model removed the oscillation in type curves and thus solved the negative skin problem. We also show that the characteristics of type curves depend heavily on the properties of different zones, skin factor, well length, formation thickness, etc. Our research can be applied to a real case study.


Transport in Porous Media | 2013

Flow Modeling of Well Test Analysis for Porous-Vuggy Carbonate Reservoirs

Ying-Lan Jia; Xiang-Yu Fan; Ren-Shi Nie; Quan-Hua Huang; Yong-Lu Jia

Porous–vuggy carbonate reservoirs consist of both matrix and vug systems. This paper represents the first study of flow issues within a porous–vuggy carbonate reservoir that does not introduce a fracture system. The physical properties of matrix and vug systems are quite different in that vugs are dispersed throughout a reservoir. Assuming spherical vugs, symmetrically distributed pressure, centrifugal flow of fluids and considering media that is directly connected with wellbore as the matrix system, we established and solved a model of well testing and rate decline analysis for porous–vuggy carbonate reservoirs, which consists of a dual porosity flow behavior. Standard log–log type curves are drawn up by numerical simulation and the characteristics of type curves are analyzed thoroughly. Numerical simulations showed that concave type curves are dominated by interporosity flow factor, external boundary conditions, and are the typical response of porous–vuggy carbonate reservoirs. Field data interpretation from Tahe oilfield of China were successfully made and some useful reservoir parameters (e.g., permeability and interporosity flow factor) are obtained from well test interpretation.


Acta Geophysica | 2012

Unsteady inter-porosity flow modeling for a multiple media reservoir

Ren-Shi Nie; Ying-Feng Meng; Yong-Lu Jia; Jian-Lin Shang; Yong Wang; Jian-Guo Li

The paper deals with unsteady inter-porosity flow modeling of underground fluid in a multiple media reservoir. Assuming spherical vugs, symmetrically distributed pressure, negligible inter-porosity flow between matrix and vug systems and centrifugal flow of the fluid from matrix blocks or vugs to fractures, and treating media directly connected with wellbore as the fracture system, we establish and solve a model of unsteady inter-porosity flow for dual and triple porosity media reservoirs. We provide simulated graphs of pressure and pressure derivative log-log type curves, and analyze the transient flow process and characteristics of type curves affected by different parameters. The new type curves of unsteady inter-porosity flow modeling are evidently different in shape and characteristics from those of pseudo-steady inter-porosity flow modeling. The location of dimensionless pressure of unsteady inter-porosity is lower than that of pseudo-steady inter-porosity, which indicates that unsteady inter-porosity flow accelerates an energy supplement during production. Qualitatively, the unsteady inter-porosity flow modeling reduces the classical V-shaped response. We also estimated parameters from well test data in real applications using this model.


AAPG Bulletin | 2014

Unsteady-state diffusion modeling of gas in coal matrix for horizontal well production

Jianchun Guo; Ren-Shi Nie; Yong-Lu Jia

In this work, an unsteady-state diffusion model was developed to describe gas transport in coal structures for horizontal well production. The model assumes unsteady-state diffusion of gas through the matrix according to Fick’s law, Darcy flow through the cleat network (natural fractures), and that gas adsorption can be described by the Langmuir equation. Then the model using Laplace integral transformation was solved. Using the new model, dimensionless-type curves for pressure-transient and rate-decline analyses were used to analyze transient transport characteristics. The differences for unsteady-state diffusion between horizontal and vertical well models and the differences for horizontal well production between unsteady-state diffusion and pseudosteady-state diffusion were specifically analyzed. Several scenarios confronting real coal beds were studied and discussed fully through simulating well production under different conditions. The research results showed that the unsteady-state diffusion model would be another choice with which to analyze well tests.


Journal of Geophysics and Engineering | 2013

A nonlinear model for fluid flow in a multiple-zone composite reservoir including the quadratic gradient term

Xiao-Lu Wang; Xiang-Yu Fan; Yong-Ming He; Ren-Shi Nie; Quan-Hua Huang

Based on material balance and Darcys law, the governing equation with the quadratic pressure gradient term was deduced. Then the nonlinear model for fluid flow in a multiple-zone composite reservoir including the quadratic gradient term was established and solved using a Laplace transform. A series of standard log–log type curves of 1-zone (homogeneous), 2-zone and 3-zone reservoirs were plotted and nonlinear flow characteristics were analysed. The type curves governed by the coefficient of the quadratic gradient term (β) gradually deviate from those of a linear model with time elapsing. Qualitative and quantitative analyses were implemented to compare the solutions of the linear and nonlinear models. The results showed that differences of pressure transients between the linear and nonlinear models increase with elapsed time and β. At the end, a successful application of the theoretical model data against the field data shows that the nonlinear model will be a good tool to evaluate formation parameters more accurately.


International Journal of Coal Geology | 2012

Modeling transient flow behavior of a horizontal well in a coal seam

Ren-Shi Nie; Ying-Feng Meng; Jianchun Guo; Yong-Lu Jia


Journal of Hydrology | 2012

Dual permeability flow behavior for modeling horizontal well production in fractured-vuggy carbonate reservoirs

Jianchun Guo; Ren-Shi Nie; Yong-Lu Jia


Spe Reservoir Evaluation & Engineering | 2012

New Type Curves for Modeling Productivity of Horizontal Well With Negative Skin Factors

Ren-Shi Nie; Yong-Lu Jia; Ying-Feng Meng; Yongheng Wang; Jian-Min Yuan; Wei-Feng Xu

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Yong-Lu Jia

Southwest Petroleum University

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Jianchun Guo

Southwest Petroleum University

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Ying-Feng Meng

Southwest Petroleum University

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Quan-Hua Huang

Southwest Petroleum University

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Xiang-Yu Fan

Southwest Petroleum University

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Qi Deng

Southwest Petroleum University

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Yong-Ming He

Chengdu University of Technology

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