A Composite Model for Multi-Stage Fractured Horizontal Wells in Heterogeneous Reservoirs (Russian)

Yao, Shanshan; Wang, Xiangzeng; Zeng, Fanhua; Li, Min; Ju, Ning

doi:10.2118/182016-ru

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…Another very commonly used model for fluid flow description in fractured-caved reservoirs is the radial-composite model, which is proposed for studying the pressure behavior in a composite reservoir with two adjacent concentric zones of different permeability (Loucks and Guerrero, 1961;Yao et al, 2016). Reservoir engineers prefer the radialcomposite model for two reasons (Xing et al, 2018).…”

Section: Nomenclaturementioning

confidence: 99%

3d Pressure Transient Analysis Model of Fractured-Caved Reservoir Based on Seismic Characterization

Wan

Liu

et al. 2019

J Por Media

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Large-scale fractures and cavities cause difficulties of geological modeling, which in turn makes the fluid flow simulation difficult. In this paper, a geological modeling process based on three-dimensional (3D) seismic characterization is proposed to model real reservoirs, and then a 3D pressure transient analysis model is developed to model the fluid flow in the fractured-caved reservoirs. In this model, the reservoir is characterized as three types of media explicitly: cavities simplified as irregular polyhedrons, fractures represented by slabs, and the matrix of the rest. A finite-element method is implemented to obtain the solutions of the governing equations. Two idealized cases of fractures and cavities are presented using the model. The results show fractures and cavities play the dominant role in the fluid flow. In the fractures case, the log-log type curves can be divided into six stages, and the bilinear flow is the main feature. A larger permeability of fractures causes a longer period of bilinear flow. The log-log type curves of the cavity case are also divided into six stages. The larger permeability of cavities, the lower the horizontal line of the pressure derivative, but the influence of cavities not connected with the wellbore is limited. Comparison with the radial-composite model shows that the radial-composite model gets a volume-equivalent radius of the cavity, but a higher permeability and a negative skin factor. The developed model is also applied for the well test analysis of a field case, which shows a significant ability to characterize the fluid flow of fractured-caved reservoirs.

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Section: Nomenclaturementioning

confidence: 99%

3d Pressure Transient Analysis Model of Fractured-Caved Reservoir Based on Seismic Characterization

Wan

Liu

et al. 2019

J Por Media

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“…Fracture-caved reservoirs have great development potential in carbonate reservoirs and are gradually becoming the focus of carbonate reservoir development. − As the demands for crude oil increase, the development of fracture-caved reservoirs is becoming an increasingly important field in energy production. − Fracture-caved reservoirs exhibit high heterogeneity due to the fractures and meter-scale caves located in the different distributions. − The large-scale caves offer ample storage space while fracture zones with higher conductivity enhance the fluid flow efficiency. − The flow behavior will be affected by the location of wells and the distribution of caves in the formation. − The complex wellbore–fracture–cave distributions and flow mechanism characterization are not clear in previous studies. Therefore, there is an urgent need to develop transient models suitable for various fracture-caved distributions.…”

Section: Introductionmentioning

confidence: 99%

“…However, models that consider the fluid flow in the matrix are not sufficiently accurate due to the low permeability and conductivity of the matrix. It is more accurate to consider the fracture zones and huge caves as storage and flow domains for fracture-caved reservoirs. − Wei et al developed three mathematical models of vertical beads-on-string structures to estimate reservoir properties. Li et al , established dual-cave dual-fracture series models and dual-cave single-fracture parallel models, which can be simplified into kinds of bead-shaped fracture-caved models.…”

Section: Introductionmentioning

confidence: 99%

Practical Semianalytical Models for Pressure-Transient Analysis of Carbonate Reservoirs with Complex Fracture and Cave Distributions

Pan,

Cheng,

Wang

et al. 2024

Energy Fuels

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Fracture-caved oil carbonate reservoirs are the focus of the exploration and development of carbonate reservoirs in China. However, the connections and distributions of well, fracture, and cave create a significant heterogeneity in the fracture-caved carbonate oil reservoirs, and the fluid flow behavior in the complex fracture-caved porous media is extremely hard to characterize. In this work, a series of simple, efficient, and practically applicable pressure-transient models exhibiting complex distributions are established with linear flow in the fracture zones and storage flow in the caves. The solutions for fracture-caved models are obtained by the Laplace transformation, Duhamel principle, and Stehfest numerical inversion. Flow behavior analysis shows that the pressure-transient analysis model for fracture-caved reservoirs may develop four flow regimes: wellbore storage flow, fracture-zone linear flow, cave storage flow, and transition flow. The results indicate that the start and duration of the linear flow are affected by the conductivity and length of the fracture zone, respectively. A larger cave volume causes a deeper and wider V-shaped segment on the pressure derivative curve. The semianalytical pressure-transient models are applied to field cases in the Shunbei block. The key physical parameters (i.e., fracture length, fracture conductivity, and cave volume) can be estimated by matching with the actual pressure and production data.

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Transient model analysis of gas flow behavior for a multi-fractured horizontal well incorporating stress-sensitive permeability

Cao

et al. 2018

J Petrol Explor Prod Technol

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The assumption of constant reservoir permeability is not strictly applicable to reservoirs where rock properties undergo changes, such as stress-sensitive porous media. Most researches on the permeability stress sensitivity mainly concentrated on experimental approach, physical modeling or pressure transient analysis, whereas rate transient analysis does not attract much attention. Based on source/sink function method, this paper develops a seepage model of multi-fractured horizontal well incorporating stress-sensitive permeability. The model is semi-analytically solved by fracture discretization, Pedrosa's transformation, perturbation theory, and integration transformation method. Not only pressure transient analysis, but also rate transient analysis is separately performed with relevant parameters. The model presented here can provide some insights into well dynamic forecasting during exploiting such reservoirs, and contribute to establish the theoretical basic for transient analysis efficiently.

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A Composite Model for Multi-Stage Fractured Horizontal Wells in Heterogeneous Reservoirs (Russian)

Cited by 9 publications

References 1 publication

3d Pressure Transient Analysis Model of Fractured-Caved Reservoir Based on Seismic Characterization

3d Pressure Transient Analysis Model of Fractured-Caved Reservoir Based on Seismic Characterization

Practical Semianalytical Models for Pressure-Transient Analysis of Carbonate Reservoirs with Complex Fracture and Cave Distributions

Transient model analysis of gas flow behavior for a multi-fractured horizontal well incorporating stress-sensitive permeability

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