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Golsanami, Mendeley N Data) - One of the best experts on this subject based on the ideXlab platform.

  • Evaluating the effect of new gas solubility and bubble point models on PVT parameters and optimizing injected gas rate in gas-lift dual gradient drilling
    2021
    Co-Authors: Golsanami, Mendeley N Data)
    Abstract:

    Gas-lift dual gradient drilling (DGD) is a solution for the complex problems caused by the narrow drilling window in deepwater drilling. However, investigations are lacking on using oil-based drilling fluid in DGD, which is the principal novel idea of the present study. Herein, Nitrogen was selected as the injection gas into the riser. This research compares the results obtained from two new models with those obtained from the Standing Correlations for solubility and bubble point pressure. Specifically, the study evaluates the PVT behaviors of drilling fluid (oil/water/nitrogen) in gas-lift dual gradient drilling operations in the case of using the new models or the Standing Correlations by coding in MATLAB environment. Standing Correlation is one of the conventional Black oil models; however, it overestimates the solubility of Nitrogen and underestimates the bubble pressure point in white mineral oil. According to the achieved results, the Standing model has some errors in evaluating the PVT behavior of Nitrogen and oil-based drilling fluids and is not recommended for the mixtures in the gas-lift dual gradient drilling. With regard to optimizing gas flow rate, it was found that the discrepancy between pressures for the new models and the Standing models is higher at both high liquid flow rates and at lower gas flow rates.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Adrian R Muxworthy - One of the best experts on this subject based on the ideXlab platform.

  • long duration 4 ma and steady state volcanic activity in the early cretaceous parana etendeka large igneous province new palaeomagnetic data from namibia
    Earth and Planetary Science Letters, 2015
    Co-Authors: Sarah C Dodd, Conall Mac Niocaill, Adrian R Muxworthy
    Abstract:

    There is long-Standing Correlation between Large Igneous Provinces (LIPs) and major mass extinction events in the Geological Record, postulated to be due to the emission of large quantities of volcanic gases over a geologically short period of time causing major climatic perturbations within the Earth system. The ∼135 Ma Parana–Etendeka volcanic province of Brazil and Namibia represents something of an enigma amongst LIPs. Despite an erupted volume (>1 Mkm3) comparable to other LIPs associated with mass extinctions, such as the Siberian or Deccan traps, it is not linked to a known mass extinction event. This suggests that the Parana–Etendeka volcanic province was emplaced over longer timescales than other LIPs, and/or emitted a lower concentration of volatiles, directly or indirectly during its emplacement. We present a new, detailed magnetostratigraphy for the Etendeka portion of the province that suggests emplacement took place over longer timescales (>4 Ma) than those associated with other LIPs. Palaeomagnetic analysis of 893 specimens from 99 sites, in sections that encompass nearly the complete Etendeka stratigraphy, yielded high-quality data from 70 sites (612 specimens). These record 16 individual polarity intervals, which can be correlated with Chrons 15 to 11 of the geomagnetic polarity time scale (GPTS) while also providing two new, high quality palaeopoles for South Africa at 130–135 Ma. Our magnetostratigraphy reveals a minimum period of volcanic activity in excess of 4 Myrs and, importantly, we find no evidence for major changes in the rates of volcanic activity through that time period, in contrast to other LIPs where volcanism seems to be concentrated in major pulses. This suggests that the anomalously feeble environmental impact of Parana–Etendeka volcanism may be due to lower effusion rates reducing the atmospheric loading due to volcanogenic volatiles.

Sarah C Dodd - One of the best experts on this subject based on the ideXlab platform.

  • long duration 4 ma and steady state volcanic activity in the early cretaceous parana etendeka large igneous province new palaeomagnetic data from namibia
    Earth and Planetary Science Letters, 2015
    Co-Authors: Sarah C Dodd, Conall Mac Niocaill, Adrian R Muxworthy
    Abstract:

    There is long-Standing Correlation between Large Igneous Provinces (LIPs) and major mass extinction events in the Geological Record, postulated to be due to the emission of large quantities of volcanic gases over a geologically short period of time causing major climatic perturbations within the Earth system. The ∼135 Ma Parana–Etendeka volcanic province of Brazil and Namibia represents something of an enigma amongst LIPs. Despite an erupted volume (>1 Mkm3) comparable to other LIPs associated with mass extinctions, such as the Siberian or Deccan traps, it is not linked to a known mass extinction event. This suggests that the Parana–Etendeka volcanic province was emplaced over longer timescales than other LIPs, and/or emitted a lower concentration of volatiles, directly or indirectly during its emplacement. We present a new, detailed magnetostratigraphy for the Etendeka portion of the province that suggests emplacement took place over longer timescales (>4 Ma) than those associated with other LIPs. Palaeomagnetic analysis of 893 specimens from 99 sites, in sections that encompass nearly the complete Etendeka stratigraphy, yielded high-quality data from 70 sites (612 specimens). These record 16 individual polarity intervals, which can be correlated with Chrons 15 to 11 of the geomagnetic polarity time scale (GPTS) while also providing two new, high quality palaeopoles for South Africa at 130–135 Ma. Our magnetostratigraphy reveals a minimum period of volcanic activity in excess of 4 Myrs and, importantly, we find no evidence for major changes in the rates of volcanic activity through that time period, in contrast to other LIPs where volcanism seems to be concentrated in major pulses. This suggests that the anomalously feeble environmental impact of Parana–Etendeka volcanism may be due to lower effusion rates reducing the atmospheric loading due to volcanogenic volatiles.

Conall Mac Niocaill - One of the best experts on this subject based on the ideXlab platform.

  • long duration 4 ma and steady state volcanic activity in the early cretaceous parana etendeka large igneous province new palaeomagnetic data from namibia
    Earth and Planetary Science Letters, 2015
    Co-Authors: Sarah C Dodd, Conall Mac Niocaill, Adrian R Muxworthy
    Abstract:

    There is long-Standing Correlation between Large Igneous Provinces (LIPs) and major mass extinction events in the Geological Record, postulated to be due to the emission of large quantities of volcanic gases over a geologically short period of time causing major climatic perturbations within the Earth system. The ∼135 Ma Parana–Etendeka volcanic province of Brazil and Namibia represents something of an enigma amongst LIPs. Despite an erupted volume (>1 Mkm3) comparable to other LIPs associated with mass extinctions, such as the Siberian or Deccan traps, it is not linked to a known mass extinction event. This suggests that the Parana–Etendeka volcanic province was emplaced over longer timescales than other LIPs, and/or emitted a lower concentration of volatiles, directly or indirectly during its emplacement. We present a new, detailed magnetostratigraphy for the Etendeka portion of the province that suggests emplacement took place over longer timescales (>4 Ma) than those associated with other LIPs. Palaeomagnetic analysis of 893 specimens from 99 sites, in sections that encompass nearly the complete Etendeka stratigraphy, yielded high-quality data from 70 sites (612 specimens). These record 16 individual polarity intervals, which can be correlated with Chrons 15 to 11 of the geomagnetic polarity time scale (GPTS) while also providing two new, high quality palaeopoles for South Africa at 130–135 Ma. Our magnetostratigraphy reveals a minimum period of volcanic activity in excess of 4 Myrs and, importantly, we find no evidence for major changes in the rates of volcanic activity through that time period, in contrast to other LIPs where volcanism seems to be concentrated in major pulses. This suggests that the anomalously feeble environmental impact of Parana–Etendeka volcanism may be due to lower effusion rates reducing the atmospheric loading due to volcanogenic volatiles.