Determination of the propagation state of the combustion zone during in-situ combustion by dimensionless numbers

Liu, Dong; Tang, Junshi; Zheng, Rencheng; Song, Qiang

doi:10.1016/j.fuel.2020.118972

Cited by 11 publications

(3 citation statements)

References 41 publications

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“…Once these parameters decrease to lower limits, a profitless development or even failed tests of ISC would occur . Liu et al used two dimensionless numbers (HD, CW), which were highly related to oil saturation and the air injection rate, to describe the stability of the ISC process . In their simulation by CMG-STARS, the lower limit values of the injection rate, O 2 concentration, and oil saturation were determined as 2 L/min, 18%, and 0.15, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…5 Liu et al used two dimensionless numbers (HD, CW), which were highly related to oil saturation and the air injection rate, to describe the stability of the ISC process. 6 In their simulation by CMG-STARS, the lower limit values of the injection rate, O 2 concentration, and oil saturation were determined as 2 L/min, 18%, and 0.15, respectively. Once any of these parameters were lower than the critical values, the fire front would extinguish soon after ignition.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Lower Limits of Physical Parameters for Heavy Oil Reservoirs during the In Situ Combustion Process

Zhao

Sun

et al. 2023

ACS Omega

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As an effective enhanced oil recovery (EOR) method in the late stage of the steam injection process, in situ combustion (ISC) has been verified by more and more researchers owing to its high recovery efficiency and low operation cost. However, the ISC process is prone to bringing about an unfavorable result with a low sweep efficiency and even an extinction process due to the complexity and uncertainty in oil and water distribution as well as the heterogeneity of the actual reservoir. In this work, combustion tube experiments combined with numerical simulations by CMG-STARS were conducted to study the influence of a reservoir′s physical parameters on the stability of ISC. It was found that the sustainability of the combustion process is sensitive to permeability and oil saturation, the lower limits of which are determined as 0.2 μm2 and 0.2, respectively. Then, a formula was preliminarily proposed as 0.25 ≤ So/K ≤ 0.8, which could be used as a reference of screening criteria in designing the ISC process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Lower Limits of Physical Parameters for Heavy Oil Reservoirs during the In Situ Combustion Process

Zhao

Sun

et al. 2023

ACS Omega

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“…Additionally, they achieve substantial underground upgrading of the heavy oils, tar sand and bitumen in such a way that chemically and physically altered pipeline-able light oils are produced. They also hold huge economic promise (Liu et al, 2021 ) and from the latest field operations information reported in this and last years, the ISC and the THAI process are very efficient (Sharma et al, 2021 ; Turta et al, 2020 ; Wei et al, 2020b ). ISC, however, is shown to suffer from gravity segregation and thus excessive gas override, and the mobilized upgraded oil has to travel over hundreds of metres before it can reach the vertical production well.…”

Section: Introductionmentioning

confidence: 99%

Detailed investigations of the influence of catalyst packing porosity on the performance of THAI-CAPRI process for in situ catalytic upgrading of heavy oil and bitumen

Ado

2021

J Petrol Explor Prod Technol

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Heavy oils and bitumen are indispensable resources for a turbulent-free transition to a decarbonized global energy and economic system. This is because according to the analysis of the International Energy Agency’s 2020 estimates, the world requires up to 770 billion barrels of oil from now to year 2040. However, BP’s 2020 statistical review of world energy has shown that the global total reserves of the cheap-to-produce conventional oil are roughly only 520.2 billion barrels. This implies that the huge reserves of the practically unexploited difficult-and-costly-to-upgrade-and-produce heavy oils and bitumen must be immediately developed using advanced upgrading and extraction technologies which have greener credentials. Furthermore, in accordance with climate change mitigation strategies and to efficiently develop the heavy oils and bitumen resources, producers would like to maximize their upgrading within the reservoirs by using energy-efficient and environmentally friendly technologies such as the yet-to-be-fully-understood THAI-CAPRI process. The THAI-CAPRI process uses in situ combustion and in situ catalytic reactions to produce high-quality oil from heavy oils and bitumen reservoirs. However, prolonging catalyst life and effectiveness and maximizing catalytic reactions are a major challenge in the THAI-CAPRI process. Therefore, in this work, the first ever-detailed investigations of the effects of alumina-supported cobalt oxide–molybdenum oxide (CoMo/γ-Al2O3) catalyst packing porosity on the performance of the THAI-CAPRI process are performed through numerical simulations using CMG STARS. The key findings in this study include: the larger the catalyst packing porosity, the higher the accessible surface area for the mobilized oil to reach the inner coke-uncoated catalysts and thus the higher the API gravity and quality of the produced oil, which clearly indicated that sulphur and nitrogen heteroatoms were catalytically removed and replaced with hydrogen. Over the 290 min of combustion period, slightly more oil (i.e. an additional 0.43% oil originally in place (OOIP)) is recovered in the model which has the higher catalyst packing porosity. In other words, there is a cumulative oil production of 2330 cm3 when the catalyst packing porosity is 56% versus a cumulative oil production of 2300 cm3 in the model whose catalyst packing porosity is 45%. The larger the catalyst packing porosity, the lower the mass and thus cost of the catalyst required per m3 of annular space around the horizontal producer well. The peak temperature and the very small amount of produced oxygen are only marginally affected by the catalyst packing porosity, thereby implying that the extents of the combustion and thermal cracking reactions are respectively the same in both models. Thus, the higher upgrading achieved in the model whose catalyst packing porosity is 56% is purely due to the fact that the extent of the catalytic reactions in the model is larger than those in the model whose catalyst packing porosity is 45%.

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Numerical Simulation of Hydrogen Production from In-Situ Combustion of Gas Reservoirs

Jin,

Pu,

Bai

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Determination of the propagation state of the combustion zone during in-situ combustion by dimensionless numbers

Cited by 11 publications

References 41 publications

Study on the Lower Limits of Physical Parameters for Heavy Oil Reservoirs during the In Situ Combustion Process

Study on the Lower Limits of Physical Parameters for Heavy Oil Reservoirs during the In Situ Combustion Process

Detailed investigations of the influence of catalyst packing porosity on the performance of THAI-CAPRI process for in situ catalytic upgrading of heavy oil and bitumen

Numerical Simulation of Hydrogen Production from In-Situ Combustion of Gas Reservoirs

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