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Third EAGE Workshop on Naturally Fractured Reservoirs
- Conference date: February 5-7, 2018
- Location: Muscat, Oman
- Published: 05 February 2018
21 - 24 of 24 results
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Discrepancies in Fracture Related Anysotropy Direction Obtained from Multi Scale Data
More LessAuthors I. Bogatyrev, E. Kharyba, K. Ezhov, T. Olneva, D. Semin and A. InozemtsevSummaryThe naturally fractured reservoirs play very important role in hydrocarbon production within Panonian basin. The well production crucially depends on the possibility to penetrate the fractured zone Fracture network cause significant anisotropy of rock properties which, in turn, could be studied with a combination of seismic and wellbore data.
AVAZ inversion and full-wave acoustic logging coupled with borehole images were implemented to estimate fracture parameters in order to predict zones of high productivity. The independent techniques revealed differences in estimated fracture direction. Discovered descrepancies are explained by different scales of the applied methods and should be taken into consideration during well planning.
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Calibration and Optimisation of Foam EOR in Fractured Carbonate Reservoirs
More LessAuthors A. Al-Maqbali, V.E. Spooner, D. Arnold and S. GeigerSummaryFractured carbonate reservoirs are known for its complexity, this has big impact on production especially when EOR methods are used. Foam is known for its potential to improve recovery by diverting the flow to the poorly swept regions. In order to capture the uncertainties associated with foam EOR in fractured carbonates, multiple simulations of different geological scenarios must be tested.
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Tensorial Fracture-Matrix Ensemble Relative Permeabilities in Naturally Fractured Reservoirs: Evidence from Discrete Fracture and Matrix Simulations
More LessAuthors M.S. Sedaghat, S.M. Matthai and S.A. AzizmohammadiSummaryThe prediction of water breakthrough and oil recovery for naturally fractured reservoirs (NFRs) cannot be performed accurately without dynamic upscaled relative permeability functions. Relative permeability is commonly assumed to be a scalar quantity, although a justification for NFRs has yet to be presented. In this study, we show how accurate this assumption is for fracture-matrix ensemble relative permeabilities determined by numeric simulations of unsteady-state core flooding.
Numerical determination of relative permeability requires a realistic flow model, a spatially adaptive simulation approach and a sophisticated analysis procedure. To fulfil these requirements, we apply discrete fracture and matrix modelling to well characterised hm-km outcrop analogues. These are parametrized with aperture, permeability, and capillary pressure data. Fracture attributes are allowed to vary from segment to segment, trying to emulate in situ conditions. The finite-element-centered-finite-volume method is used to simulate two-phase flow in the fractured rock, considering different wettability conditions.
Our results indicate that the ensemble relative permeability of 2D digital NFR outcrop analog models is a tensor property. The tensors are not necessarily symmetric, and their eigenvalues are not always equal to the diagonal terms. Also, the off-diagonal terms can determine the type, i.e., counter vs co-current imbibition, and the direction of imbibition.
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Static Reservoir Modelling of Fractured Carbonates: Multi Scenario Approach, Case Study from the Potwar Basin, Pakistan
More LessSummaryThe Dhurnal field is a mature hydrocarbon accumulation discovered in 1984 and located 60 km South West of Islamabad, Pakistan in the Potwar basin, at the foothills of the Himalayas. To date, seven wells have been drilled in the Dhurnal structure and are producing hydrocarbons from several stacked carbonates reservoirs aging from the Permian to the Miocene. Due to the tight nature of the reservoirs, hydrocarbon production is enabled by the existence of an extensive fracture network.
The ongoing Dhurnal Reservoir Modelling project represents the last opportunity to identify late life opportunities and to ensure that no stones are left unturned (bypassed Oil).
A state of the art fractured carbonates reservoir static model exercise has been conducted to:
- Serve as platform for history matching the historical performance of the field
- Subsequently Locate the Remaining Oil
- Forecast with adequate uncertainty ranges potential further development opportunities
- Establish a standardized workflow to routinely model fractured carbonates reservoirs in the Potwar Basin.
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