Simulation of Complex Carbonate Field: Double Media vs. Single Media Kharyaga Field Case (Russian)

Khvatova, Irina Evgenievna; Renaud, Antoine; Malyutina, Galia; Sansiev, G. V.; Kuzilov, Igor; Minnibaeva, Tatyana

doi:10.2118/160585-ru

Cited by 4 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MMMs are commonly used in the fractured-caved reservoirs (Khvatova et al, 2012;Shakerinezhad et al, 2013). In the model, each medium is continuous and overlapped with each other, which implies that a spatial point possesses the triple media simultaneously.…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

Methodology of Experiment to Investigate Connection Between Hydraulic Fractures and Vugs in Fracture–Vug Carbonate Formations

Zhou

Wang

2021

Journal of Energy Resources Technology

View full text Add to dashboard Cite

Fracture-vug carbonate formations are the significant oil and gas reservoirs in China, Middle East, and North America. During development, it is required to connect between hydraulic fracture and as many vugs as possible which are the main geological component to store oil and gas. This paper introduces an advanced experimental methodology to directly observe the connection of hydraulic fractures with vugs. It studied the factors that could affect that connection. The work was based on geological information of Tarim basin which is the largest fracture-vug carbonate formation in China. According to the experiment, under higher horizontal stress difference more vugs could be connected. In addition, higher fracture density could improve the connection. This methodology could be used in the future study for the fracture-vug carbonate formation. In addition, the experimental result could be used to design and evaluate hydraulic fracturing works.

show abstract

Unified Finite Difference Modeling of Transient Flow in Naturally Fractured Carbonate Karst Reservoirs - A 3D Case Study

Killough

Fadlelmula

et al. 2015

SPE Annual Technical Conference and Exhibition

View full text Add to dashboard Cite

The modeling and numerical simulation of fluid flow in naturally fractured carbonate karst reservoirs are extremely challenging due to non-Darcy flow in vugs and caves connected by fracture networks. The momentum balance of such flow has been shown to be better described by the Brinkman equation both physically and mathematically, and many methods have been proposed in the literature dealing with the steady-state Brinkman model. We carry Brinkman's idea one step further and propose a transient flow model which consists of the Brinkman equation and a generalized material balance equation, and the latter has proven to be exact in the fractured carbonate karst reservoir. Finite differences are implemented for the solution of the proposed transient flow model. This solution method is more straightforward, easier to derive and implement, and more apt to generalization from 2D to 3D cases than alternative techniques. Numerical simulation of the transient Brinkman model requires explicit solution of not only pressure at the center of each grid block, but also velocities at the interfaces between the blocks, which exaggerates the computational cost and makes the computational process more difficult and less stable. In this paper, we propose a simplified finite difference formulation of the transient Brinkman model, which significantly reduces the computational time of the simulation process, and improves accuracy and stability of the simulation results. We update our reservoir simulator with this new formulation and illustrate it with a complex 3D naturally fractured carbonate karst reservoir model. The results of this study form the foundation for future 3D multi-phase reservoir cases.

show abstract

Simulation of Complex Carbonate Field: Double Media vs. Single Media Kharyaga Field Case (Russian)

Cited by 4 publications

References 0 publications

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

Methodology of Experiment to Investigate Connection Between Hydraulic Fractures and Vugs in Fracture–Vug Carbonate Formations

Unified Finite Difference Modeling of Transient Flow in Naturally Fractured Carbonate Karst Reservoirs - A 3D Case Study

Contact Info

Product

Resources

About