Improving Reactive Transport Modelling Predictivity for ASP Flooding Simulations

Li, Xipeng; Wei, Lingli; Zhang, Huanhuan

doi:10.2118/179840-ms

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…They have shown success in real project applications [39][40][41]. Some commercial reservoir simulators have coupled the reactive transport module (such as CMG-GEM [42] and MoReS-PhreeqC [43]) and were successfully applied in enhanced oil recovery research or real projects [44,45].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of CO2, Water, Sodium Chloride, and Magnesium Carbonates Equilibrium to High Temperature and Pressure

2019

Energies

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In this work, a thermodynamic model of CO2-H2O-NaCl-MgCO3 systems is developed. The new model is applicable for 0–200 °C, 1–1000 bar and halite concentration up to saturation. The Pitzer model is used to calculate aqueous species activity coefficients and the Peng–Robinson model is used to calculate fugacity coefficients of gaseous phase species. Non-linear equations of chemical potentials, mass conservation, and charge conservation are solved by successive substitution method to achieve phase existence, species molality, pH of water, etc., at equilibrium conditions. From the calculated results of CO2-H2O-NaCl-MgCO3 systems with the new model, it can be concluded that (1) temperature effects are different for different MgCO3 minerals; landfordite solubility increases with temperature; with temperature increasing, nesquehonite solubility decreases first and then increases at given pressure; (2) CO2 dissolution in water can significantly enhance the dissolution of MgCO3 minerals, while MgCO3 influences on CO2 solubility can be ignored; (3) MgCO3 dissolution in water will buffer the pH reduction due to CO2 dissolution.

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Section: Introductionmentioning

confidence: 99%

Numerical Modeling of CO2, Water, Sodium Chloride, and Magnesium Carbonates Equilibrium to High Temperature and Pressure

2019

Energies

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“…The PHREEQC can simulate different geochemical calculations of aqueous phase and reactive transport 1D with a vast thermodynamic database of minerals and compounds. In addition, PHREEQC is the most widely used program in geochemical modeling processes such as speciation, chemical equilibriums, and batch-reaction processes. − Likewise, it is possible to couple PHREEQC with other simulators, such as UTCOMP and Shell MoReS. − …”

Section: Introductionmentioning

confidence: 99%

Dissolution Evaluation of Coquina, Part 1: Carbonated-Brine Continuous Injection Using Computed Tomography and PHREEQC

et al. 2018

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Carbonate reservoirs are susceptible to dissolution and precipitation effects when an acid solution enters into contact with its matrix rock, and the main interest with regard to fluid flow and storage is the alteration of the petrophysical properties, such as porosity and permeability. Dynamic experiments of injection of carbon dioxide enriched brine through the outcrop sample (coquina) was carried out at T = 20 °C and P = 2000 psi at flow rates of 0.5, 1, and 2 mL/min. X-ray computerized tomography (CT) was used to determine the porosity of the sample throughout the test, and rock permeability was evaluated by a series of pressure transducers installed at a special core holder with six pressure taps. The results include the variation of the petrophysical properties along the core sample and its evolution over time. The research covers experimental and simulation approaches; for instance, the PHREEQC was used to develop a geochemical model to fit results from calcium content analysis from effluents and porosity profiles obtained by CT scan. A very instructive sequence of images documents the formation of a highly conductive flow channel, initiated and formed as a dominant wormhole, which dramatically increases permeability and porosity through the experiment course. The dissolution regime was characterized by the Damköhler and Péclet numbers. The robust perspective of this paper showed that it is feasible to estimate the chemical and physical alterations from laboratory results on future application in the reservoir field scale by coupling experimental data and numerical modeling.

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Production Chemistry Issues and Solutions Associated with Chemical EOR

Graham¹,

Frigo²

2019

SPE International Conference on Oilfield Chemistry

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Chemical EOR is an increasingly employed approach used to enhance oil recovery by combining changes in fluids mobility, macroscopic sweep, interfacial tension, etc. to essentially improve, or extend the economic life of a water flood. It includes flooding with polymer, surfactant, alkaline/surfactant, alkaline-surfactant-polymer (ASP), CO2 and / or other miscible gases which is often combined with waterflood (e.g., CO2 WAG) etc. However, the improved oil recovery is often accompanied by physical and chemical changes in the produced fluids that cause many production-chemistry (PC)-related challenges when fluids subsequently arrive in the production system, including exacerbation of scale and naphthenates deposition, carboxylate deposits associated with injected polymer, enhanced corrosion and separation issues, etc. Understanding and predicting the production chemistry challenges at producers are further complicated by chemical changes as the fluids propagate through the reservoir such as reaction with reservoir formation minerals, chemical retention, chemical degradation and hydrolysis, etc. More importantly the implications for the production system and processing facilities are not always accounted for and proactively managed. The paper evaluates the main chemical changes that occur in the system for each EOR approach –– and shows how these changes, including in situ reservoir reactions and the stability/instability of the EOR packages themselves can exacerbate a range of PC-related challenges especially when considering the likely production of up to three different fluids: formation water, the EOR flood medium and any previous flood water from previous secondary recovery The paper includes modelling results, laboratory results to validate model predictions as well as examples from field case studies to illustrate the impact of the chemical changes referred to above. Specific highlights include the impact of the use of either high- or low-pH EOR fluids on scale control, corrosion control and asphaltenes control; for scale it examines both inhibitor performance per se as well as retention onto rock during squeeze treatment. Also illustrated are the risk of carboxylate-based deposit derived from polymer flood, and the phenomenon of carboxylate-based solids and soaps, which can exacerbate the separation of an already highly challenging system. The overall conclusion is that chemical EOR can have significant impact on PC and that these should not just be considered at the design stage and not just for the injection system but also to take into account the impact these may have on production wells following breakthrough of flood waters, showing that essentially each new or exacerbated PC issues can be predicted or at least anticipated with the required degree of confidence before implementation of EOR.

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Improving Reactive Transport Modelling Predictivity for ASP Flooding Simulations

Cited by 3 publications

References 33 publications

Numerical Modeling of CO2, Water, Sodium Chloride, and Magnesium Carbonates Equilibrium to High Temperature and Pressure

Numerical Modeling of CO2, Water, Sodium Chloride, and Magnesium Carbonates Equilibrium to High Temperature and Pressure

Dissolution Evaluation of Coquina, Part 1: Carbonated-Brine Continuous Injection Using Computed Tomography and PHREEQC

Production Chemistry Issues and Solutions Associated with Chemical EOR

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