Investigation radii in multi-zone composite reservoirs

Nie, Ren-Shi; Hao, Zhou; Chen, Zhangxin; Guo, Jianchun; Yu, Xiong; Chen, Yangyang; He, Wen-Fa

doi:10.1016/j.petrol.2019.106262

Cited by 10 publications

(7 citation statements)

References 31 publications

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“…In this geometry, there is a radial change in properties between the two distinct regions guided by the investigation radii. In radially composite reservoirs, the pressure response reflects the properties of both regions (Nie et al 2019).…”

Section: Conceptual Modelmentioning

confidence: 99%

“…The relations between the regions and layers are expressed by the coupling conditions. The pressure and flow-rate equalities in each region at the interface between them, that is, at the water front radius ( r F ), represent the coupling conditions by region (CCR) (Nie et al 2011(Nie et al , 2019. This condition is defined as: CCR:…”

Section: Mathematical Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Dual-phase flow in two-layer porous media: a radial composite Laplace domain approximation

Mastbaum

Souza

Neto

et al. 2021

J Petrol Explor Prod Technol

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The main purpose of this work is to present an interpretation method for injectivity test in a two-layer reservoir that can be extended to a multilayer approach, based on new analytical solutions to the well pressure response. The developed formulation uses a radially composite reservoir approach and considers that the water front propagation may be approximated by a piston-like flow displacement. The reservoir is assumed to be laterally infinite and properties such as permeability and porosity may be different in each layer. The solutions were developed in the Laplace domain and then inverted to real domain using the Stehfest Algorithm. The proposed formulation was then validated by comparison with a numerical flow simulator. Results showed a good agreement between the numerical simulator and the analytical model. Also, a sensitivity study was done by comparing the results of different scenarios varying oil viscosities and injection flow rate to assess how these properties affect the pressure and pressure derivative profiles.

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Section: Conceptual Modelmentioning

confidence: 99%

Section: Mathematical Formulationmentioning

confidence: 99%

Dual-phase flow in two-layer porous media: a radial composite Laplace domain approximation

Mastbaum

Souza

Neto

et al. 2021

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…The radius of investigation is an important parameter for evaluating the controlled reserve of a gas well [1][2][3]. When a production well starts producing, the distribution profile of reservoir pressure becomes a funnel shape (i.e., a pressure drop funnel).…”

Section: Introductionmentioning

confidence: 99%

“…When a production well starts producing, the distribution profile of reservoir pressure becomes a funnel shape (i.e., a pressure drop funnel). The distance from the production well to the edge of the pressure drop funnel is known as the radius of investigation [1]. For a closed constant-volume gas reservoir, when the pressure reaches the boundary, the pressure wave no longer propagates outward, and the flow status of the gas reservoir becomes pseudo-steady state.…”

Section: Introductionmentioning

confidence: 99%

Calculation Model of Drainage Radius of Single-Layer/Multi-Layer Commingled Gas Production Wells in a Closed Constant-Volume Gas Reservoir and Its Application

Xin,

Zhou,

Zhang

et al. 2024

Applied Sciences

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Gas drainage radius is the most important parameter for determining reasonable well spacing. However, the drainage radius of both single-layer and multi-layer commingled gas production wells cannot be directly obtained through reservoir well tests. In order to address the above challenge, for single-layer gas production wells in a closed constant-volume gas reservoir, a calculation model for drainage radius is derived using the modified flowing material balance method. The results indicate that the calculated error of this model is only 0.73% and much smaller than that of the flowing material balance method (5.78%), implying its high accuracy. For multi-layer commingled gas production wells, another calculation model of drainage radius is established by coupling the pseudo-steady-state production capacity equation with the material balance principle. The research results demonstrate that the novel calculation model has a maximum relative error of only 2.33% and requires only two production profile tests to rapidly calculate the drainage radius of each layer within the gas reservoir, suggesting its satisfactory simplicity, significant efficiency and high precision. The proposed calculation models of drainage radius achieve a convenient and rapid calculation for both single-layer and multi-layer commingled gas production wells, and fill the theoretical gap in efficient calculation of drainage radius for a closed constant-volume gas reservoir.

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“…However, it is time-consuming in gridding and simulating, which makes numerical models less attractive. Analytical models not only capture the reservoir architecture of carbonate reservoirs but also have much higher computational efficiency than numerical models, which have recently attracted more and more attention [25][26][27][28][29][30][31]. Fetkovich [32] expanded Arps's approach to cover the transient flow condition using analytical flow equations.…”

Section: Introductionmentioning

confidence: 99%

A Practical Methodology for Production Data Analysis in Carbonate Reservoirs Using New Decline Type Curves

et al. 2020

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Carbonate reservoirs typically have complex pore structures, so the production wells typically have high production in the early production stage, but they decline rapidly. It is highly challenging to achieve accurate interpretation results. In this paper, a new and practical methodology for production data analysis of fractured and fractured-vuggy carbonate reservoirs is proposed. Firstly, analytical solutions to characterize the different multipore media and simulate transient production behavior of fractured and fractured-vuggy carbonate reservoirs during the transient flow regime are presented. Then, a new function f q D and f ′ q D that related to the dimensionless production rate is introduced, and a series of new decline type curves are drawn to make a clear observation of different flow regimes. In addition, the effects of the storativity ratio, interporosity flow coefficient, skin factor, and dimensionless radial distance of external boundary on production performance are also analyzed. Finally, two example wells from the fractured and fractured-vuggy carbonate reservoirs are used to perform rate decline analysis with both the Blasingame type curves and the new type curves. The validation of the new method is demonstrated in comparison to the results of well test interpretation. The results show that the curves of 1 / f ′ q D vs. t D are ∧ -shaped for dual-porosity reservoirs and M -shaped for triple porosity reservoirs and also indicate that the interpreted parameters such as permeability, skin factor, storativity ratio, and interporosity flow coefficient using new decline type curves are aligned well test interpretation. In correlation with other traditional well test analysis, this approach effectively reduces the multisolution probability of interpretation.

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Investigation radii in multi-zone composite reservoirs

Cited by 10 publications

References 31 publications

Dual-phase flow in two-layer porous media: a radial composite Laplace domain approximation

Dual-phase flow in two-layer porous media: a radial composite Laplace domain approximation

Calculation Model of Drainage Radius of Single-Layer/Multi-Layer Commingled Gas Production Wells in a Closed Constant-Volume Gas Reservoir and Its Application

A Practical Methodology for Production Data Analysis in Carbonate Reservoirs Using New Decline Type Curves

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