A Multicomponent Isothermal System for Efficient Reservoir Simulation

Blaskovich, F.T.; Cain, G.M.; Sonier, F.; Waldren, D.; Webb, S.J.

doi:10.2523/11480-ms

Cited by 37 publications

(20 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When matrix-matrix interblock flow is significant (Type-III fractured reservoirs as classified by Nelson, 2001), and must therefore be included in the model, we require a dual-porosity/dual-permeability representation. Models of this type were first introduced by Blaskovich et al (1983) and Hill and Thomas (1985). By adding the matrix to matrix connections, the matrix blocks are no longer isolated, and contribute to the overall fluid flow.…”

Section: Impact On the Reservoir Dynamicmentioning

confidence: 99%

Detection of Bedding Corridors From Open-hole Logs in Vertical Wells and Their Impact on Geomechanical Assessment

Sirat

Noufal

2015

Day 2 Tue, September 15, 2015

View full text Add to dashboard Cite

Bedding corridors are sub-horizontal tabular bodies of bedding plane weak zones formed as shear swarms, which vertically divide the entire reservoir thickness and extend laterally as their layers. Bedding corridors are genetically related to shearing along the bedding planes and they contribute to the conductive systems in few Abu Dhabi reservoirs. They can be best identified from horizontal borehole image logs, and as spikes in open-hole logs. Natural bedding corridors can be considered as indicators of the reservoir stress history, where they form extraordinary clusters of a huge number of quasi-parallel shear fractures in a transpressional regime.In many oil and gas reservoirs, natural bedding corridors networks help drain hydrocarbons and other fluids. The role of bedding corridors is particularly important in reservoirs having a tight matrix. In carbonate formations, for example, it is quite common to observe a permeability contrast of 1000mD or more between the rock matrix and surrounding bedding corridors. In this paper we differentiate between image-log porosity and density-neutron porosity, which is regarded as secondary porosity attributable to fractures. We also introduce here a working hypothesis about their effect on hydrofraccing being part of geomechanical assessment.Results indicate that the horizontal stress anisotropy (Shmin/SHmax ratio) is the key parameter to predict bedding corridors behavior under different stress regimes. Swapping stresses with depth is common in Abu Dhabi fields, where a strike-slip regime can open and dilate the shear along the bedding planes. It is recommended to opt for horizontal wells hydrofraccing to maximize the intersection of those bedding corridors compared to vertical wells.The significance of this approach is that once a diagnostic signature can be recognized in open-hole logs, in combination with lost circulation data, it can be used to locate bedding corridors in other vertical wells with no image logs. Geomechanically, these corridors can be used efficiently to increase production particularly in tight and unconventional reservoirs.

show abstract

Section: Impact On the Reservoir Dynamicmentioning

confidence: 99%

Detection of Bedding Corridors From Open-hole Logs in Vertical Wells and Their Impact on Geomechanical Assessment

Sirat

Noufal

2015

Day 2 Tue, September 15, 2015

View full text Add to dashboard Cite

show abstract

“…, 17 Gilman and Kazemi,18 and Blaskovich et ai. 19 Pseudocapillary pressures are generated to account for nonuniform properties.…”

Section: Et Ai4 Andmentioning

confidence: 99%

Simulations of Naturally Fractured Reservoirs

Dean¹,

Lo²

1988

SPE Reservoir Engineering

123

View full text Add to dashboard Cite

This paper describes a three-dimensional (3D), three-phase, black-oil model being used to simulate naturally fractured reservoirs. The program is fully implicit and can perform single-porosity, dual-porosity, or dual-permeability computations. Sample simulations are presented to illustrate the differences between the three computational techniques. Single-porosity recoveries are much larger than the recoveries predicted by the dual techniques. The dual-permeability, primary-depletion recoveries are very similar to the dual-porosity, primary-depletion recoveries, while the dual-permeability waterflood recoveries are significantly larger than the dual-porosity waterflood recoveries.Pseudocapillary pressures are generated from fine-grid, single-matrix block studies. The pseudocapillary pressures are then used in the dual-porosity simulations to account for fluid distributions in the matrix and fracture systems.

show abstract

“…Kazemi et al (1976) and Saidi (1983) extended to multiphase flow and developed dual porosity simulators. Later, Blaskovich et al (1983) and Hill (1985) developed dual permeability models which also allow for simulating matrix-to-matrix flow. However, fracture uniformity presumed in these models does not conform to outcrop observations, which indicated that height, length, aperture, spacing, and network connectivity of natural fractures vary substantially in the subsurface.…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Discrete Fracture Model for Fluid Flow in Fractured Low-Permeability Reservoirs

Lei

Gong

Wang

et al. 2015

Day 3 Wed, September 16, 2015

View full text Add to dashboard Cite

Waterflooding has been an effective method for improving oil recovery process of Low-Permeability Reservoirs. Tight Low-Permeability reservoirs are characterized by natural fractures, hydraulic fractures, and induced fractures by water injection. These fractures may have a significant impact on process performance and ultimate recovery. The interaction between pre-existing natural fractures and the propagating fractures are critical factors affecting the complex fracture network. It is a great challenge to model accurately fluid flow due to the multi-scale nature of the problems and the strong coupling that exists between flow and mechanical behaviors.In this paper, a dynamic discrete Fracture modeling approach was developed and implemented which enabled integrated simulation of fracture network propagation, interactions between hydraulic fractures and pre-existing natural fractures, fracture fluid leak off and fluid flow in reservoir. We apply the Discrete Fracture Modeling (DFM) approach to represent large-scale fractures individually and explicitly. The model allows inclusion of the impact of stress regime on fluid flow in a discrete fracture network. This entails highly constrained unstructured gridding and construction of a connection (transmissibility) list of all neighboring cells. A methodology for modeling fracture propagation in length-and height-direction is presented with respect to poro-and thermo-elastic stresses acting on the fracture. The method was solved using the discrete fracture control volume method. Results were obtained in terms of saturation and pressure distribution for various fractured porous media. Comparisons for simulation results and well production performance show an excellent match. The new model allows us to better understand the multi-scale and multi-physics flow behavior caused by complex fracture system. Sensitivity studies by varying the production rate, pressure and fracture parameters could be conducted to provide guidance on optimizing production designs. The simulation results show that reservoir dynamic fractures play an important role in both direction and speed of water displacement fronts through tight low-permeability reservoirs. The oil recovery rate significantly depends on the fractures orientation and the rate of fracture growth.The proposed simulation method provides a useful tool for modeling the effect of fractures on waterflooding performance and can be used to optimize injection pressures and rates, water quality as well as well patterns for maximizing oil recovery.

show abstract

A Multicomponent Isothermal System for Efficient Reservoir Simulation

Cited by 37 publications

References 1 publication

Detection of Bedding Corridors From Open-hole Logs in Vertical Wells and Their Impact on Geomechanical Assessment

Detection of Bedding Corridors From Open-hole Logs in Vertical Wells and Their Impact on Geomechanical Assessment

Simulations of Naturally Fractured Reservoirs

A Dynamic Discrete Fracture Model for Fluid Flow in Fractured Low-Permeability Reservoirs

Contact Info

Product

Resources

About