Mathematical modelling of carbonate reservoir dissolution and prediction of the controlled hydrochloric  acid  treatment  efficiency

Rabaev, R.U.; Чибисов, А. В.; Kotenev, A.Yu.; Kotenev, M.Yu.; Dubinskiy, G. S.; Muhametshin, V.Sh.; Efimov, E.R.

doi:10.5510/ogp20210200494

Cited by 2 publications

(5 citation statements)

References 1 publication

(8 reference statements)

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“…To comprehensively examine the effects of the rock matrix on the resistivity of fractured reservoirs, the effect of matrix porosity was further simulated. Considering the absence of matrix porosity in the theoretic resistivity model proposed in this study, we first converted the given matrix porosity into R s using Archie's equation and then substituted it into Equations ( 1) and (18) to indirectly simulate the effect of matrix porosity on rock resistivity (Figure 5f). In this scenario, the matrix water saturation S w was 30%, with w = 40 µm, θ = 80 • , h = 0.32 µm, and R w = 0.04 Ω.m.…”

Section: Fracture Parametersmentioning

confidence: 99%

“…Due to their intense heterogeneity, carbonate reservoirs exhibit features of secondary porosity, including dissolution-enhanced Processes 2024, 12, 43 2 of 21 fractures and vugs, making their microscopic pore structures exceedingly complex [6,14,15]. These complex fractured-cavernous structures in carbonate reservoirs result in inexplicable resistivity response patterns [16][17][18], such as numerous layers with anomalously high resistivity, dense layers with low resistivity, and water-bearing layers with high resistivity. Hence, examining the effects of these fractured-cavernous structures on the resistivity of geofluid-saturated rocks is important to deepen the understanding of their resistivity response patterns, identify their fluid properties, and evaluate their fluid saturation state during the exploration and development of complex fractured-cavernous carbonate hydrocarbon reservoirs.…”

Section: Introductionmentioning

confidence: 99%

“…Physical experiments and theoretical simulations are two fundamental approaches in rock physics research [11,[18][19][20][21][22][23][24]. When physical experiments or the observation of certain parameters in specific rock media become challenging, theoretical simulations can offer advantages.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Simulation of the Resistivity and Fractured–Cavernous Structures of Carbonate Reservoirs

Zhang,

Gao,

Gao

et al. 2023

Processes

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Recently, theoretical modeling based on rock physics has emerged as a pivotal approach to studying the resistivity of complex fractured–cavernous microstructures. In this work, to study the effects of fractured–cavernous structures on carbonate reservoir resistivity, electrical conductivity models were developed based on the effective medium theory and Ohm’s Law, and theoretical simulations were performed to examine how the porosity and resistivity of the rock matrix, the formation water resistivity, and the parameters of the fractured–cavernous microstructure affect the resistivity of rocks saturated with petroleum or water. Furthermore, the modeling results revealed the specific relationships between these factors in petroleum-saturated and water-saturated rocks. For vuggy reservoirs, a significant negative correlation between throat diameter and resistivity was revealed when variations in the rock matrix and formation water resistivity were negligible. Furthermore, the pore shape—especially the extension of pores in the direction of the current—severely reduced the resistivity of petroleum-saturated rocks. For fractured reservoirs, the porosity and resistivity of the rock matrix were the primary factors affecting resistivity, with the fracture inclination angle and width also exhibiting pronounced effects on the resistivity of water-saturated rocks. The rock cementation exponent was much smaller when the matrix pores were interconnected through fractures than when they were interconnected through throats. The findings reveal that the effects of the structural parameters of fractured–cavernous carbonate reservoirs on reservoir resistivity differ between petroleum-saturated and water-saturated rocks. The conventional Archie’s equation is insufficient for evaluating fluid saturation in carbonate reservoirs. A saturation evaluation model with a variable rock cementation exponent tailored to the specific reservoir type should thus be developed.

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Section: Fracture Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical Simulation of the Resistivity and Fractured–Cavernous Structures of Carbonate Reservoirs

Zhang,

Gao,

Gao

et al. 2023

Processes

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“…However, their modelling results refer only to available measurements of parameters of zonal sections (segments) of control objects. Conditions for modelling of formation operation with spatially distributed coordinates on the basis of electromechanical and hydraulic analogies are significantly violated in non-stationary mode of oil extraction [28][29][30].…”

mentioning

confidence: 99%

“…Each fluctuation pr F i is characterized by different lengths (or slope) of forward (ascending branch) and back (descending branch) fronts of transient processes during current prediction of residual oil saturation oil.res and piezoconductance  linear values [15,29,41]. In terms of hydraulic shock theory, such localization of fronts of each fluctuation is characterized as amplitude of pulsations smoothing ("slumping") in the disturbed interwell FDC area at continuous changes.…”

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confidence: 99%

Application of resonance functions in estimating the parameters of interwell zones

Баталов

Андреев

Mukhametshin

et al. 2022

PMI

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It is shown that the use of force resonance leads to the effect of “shaking” the formation, followed by breaking up the film oil and involving it in the further filtration process. For the first time in oilfield geophysics, the concept of passive noise-metering method is justified for monitoring oil and gas deposit development by measuring the quality factor of the contours in the point areas of formation development channels in interwell zones. It is established that determining the depth of modulation for the reactive substitution parameter of the linear FDC chain is crucial not only for determining the parametric excitation in FDC attenuation systems, but also without attenuation in the metrological support for the analysis of petrophysical properties of rock samples from the wells. It is shown that based on the method of complex amplitudes (for formation pressure current, differential flow rates, impedance), different families of resonance curves can be plotted: displacement amplitudes (for differential flow rates on the piezocapacity of the studied formation section), velocities (amplitudes of formation pressure current) and accelerations (amplitudes of differential flow rates on the linear piezoinductivity of the FDC section). The use of predicted permeability and porosity properties of the reservoir with its continuous regulation leads to increased accuracy of isolation in each subsequent sub-cycle of new segment formation in the FDC trajectories, which contributes to a more complete development of productive hydrocarbon deposits and increases the reliability of prediction for development indicators.

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Mathematical modelling of carbonate reservoir dissolution and prediction of the controlled hydrochloric acid treatment efficiency

Cited by 2 publications

References 1 publication

Theoretical Simulation of the Resistivity and Fractured–Cavernous Structures of Carbonate Reservoirs

Theoretical Simulation of the Resistivity and Fractured–Cavernous Structures of Carbonate Reservoirs

Application of resonance functions in estimating the parameters of interwell zones

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