Study on the migration law of CO2 miscible flooding front and the quantitative identification and characterization of gas channeling

Li, Jing; Cui, Chuanzhi; Wu, Zhongwei; Wang, Zhen; Wang, Zhaokai; Yang, Huichao

doi:10.1016/j.petrol.2022.110970

Cited by 14 publications

(9 citation statements)

References 19 publications

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“…According to the research of Li et al, 17 taking the dimensionless CO 2 concentration value as the judgment standard and taking Figure 10 as an example, the position when the dimensionless CO 2 concentration value reaches 0.95 is regarded as the CO 2 front, the position when the dimensionless CO 2 concentration value reaches 0.05 is regarded as the miscible zone front, and the middle area with the boundary of 0.05 and 0.95 is regarded as the miscible zone. When the CO 2 concentration at an outlet location is greater than 0, the dimensionless CO 2 concentration is also greater than 0, indicating that CO 2 has reached that outlet location.…”

Section: Resultsmentioning

confidence: 99%

“…In physical simulations, core displacement experiments 12 − 14 and nuclear magnetic resonance experiments 15 , 16 are mainly used to study the migration law of CO 2 under macroscopic conditions. Numerical simulation methods mainly focus on the establishment of convection–diffusion equations 17 , 18 and the simulation of macroscopic and microscopic seepage processes. 19 , 20 In terms of numerical simulation, Ju et al 21 established a multicomponent nonisothermal CO 2 miscible displacement mathematical model and developed a numerical simulation program to predict the process of CO 2 miscible displacement.…”

Section: Introductionmentioning

confidence: 99%

“…In physical simulations, core displacement experiments − and nuclear magnetic resonance experiments , are mainly used to study the migration law of CO 2 under macroscopic conditions. Numerical simulation methods mainly focus on the establishment of convection–diffusion equations , and the simulation of macroscopic and microscopic seepage processes. , In terms of numerical simulation, Ju et al established a multicomponent nonisothermal CO 2 miscible displacement mathematical model and developed a numerical simulation program to predict the process of CO 2 miscible displacement. Afshari et al used pore-scale numerical simulation to study the flow and transport dynamics during miscible flooding with a reverse viscosity ratio in the heterogeneous round particle model and normalized the length–time curve of the miscible zone relative to the control parameters, such as the viscosity ratio, heterogeneity, medium length, and medium aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Cui

et al. 2023

ACS Omega

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CO 2 miscible flooding in low permeability reservoirs is conducive to significantly improving oil recovery. At present, the microscopic displacement simulation of CO 2 miscible flooding is mainly reflected in the simulation of the seepage process, but the pressure control of the seepage process is lacking, and the simulation of the characterization of CO 2 concentration diffusion is less studied. In view of the above problems, a numerical model of CO 2 miscible flooding is established, and the microscopic seepage characteristics of interphase mass transfer in CO 2 miscible flooding are analyzed by multiphysics field coupling simulations at the two-dimensional pore scale. The injection velocity, contact angle, diffusion coefficient, and initial injection concentration are selected to analyze their effects on the microscopic seepage characteristics of CO 2 miscible flooding and the concentration distribution in the process of CO 2 diffusion. The research shows that after injection into the model, CO 2 preferentially diffuses into the large pore space and forms a miscible area with crude oil through interphase mass transfer, and the miscible area expands continuously and is pushed to the outlet by the high CO 2 concentration area. The increase in injection velocity will accelerate the seepage process of CO 2 miscible displacement, which will increase the sweep area at the same time. The increase in contact angle increases the seepage resistance of CO 2 and weakens the interphase mass transfer with crude oil, resulting in a gradual decrease in the final recovery efficiency. When the diffusion coefficient increases, the CO 2 concentration in the small pores and the parts that are difficult to reach at the model edge will gradually increase. The larger the initial injection concentration is, the larger the CO 2 concentration in the large pore and miscible areas in the sweep region at the same time. This study has guiding significance for the field to further understand the microscopic seepage characteristics of CO 2 miscible flooding under the effect of interphase mass transfer.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Cui

et al. 2023

ACS Omega

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“…Therefore, it is urgent that the development mode is adjusted and the reservoir recovery is further enhanced. , As a common displacement method, CO 2 miscible flooding can adapt to high temperature, pressure, and salinity conditions while reducing interfacial tension, increasing crude oil swelling, and decreasing oil viscosity, , effectively expanding the swept volume and improving the displacement efficiency . CO 2 flooding can also reduce greenhouse gas emissions by burying CO 2 underground for long periods . At present, CO 2 miscible flooding has become a global research hot spot for enhanced oil recovery (EOR). − However, the heterogeneity of the reservoir often leads to gas channeling during CO 2 flooding, reducing the swept volume .…”

Section: Introductionmentioning

confidence: 99%

Study on Enhanced Oil Recovery Mechanism of CO₂ Miscible Flooding in Heterogeneous Reservoirs under Different Injection Methods

Chen

Cao

et al. 2023

ACS Omega

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The mechanism by which oil recovery can be enhanced by different injection methods of CO 2 miscible flooding to alleviate the influence of heterogeneous reservoirs was studied to optimize the injection methods, further improving oil recovery. According to the reservoir heterogeneity characteristics of the TI oil formation group in Lunnan Oilfield, a 1 m double-layer long core was designed and prepared for four CO 2 miscible displacement experiments with different injection methods. By analyzing the variation in the injection-production parameters, the displacement effects of different injection methods were compared, and the mechanism of enhanced oil recovery (EOR) was summarized. The results indicate the following. ① The displacement efficiency of the different injection methods lies in the following order. Alternate CO 2 −water injection, continuous CO 2 flooding, cyclic CO 2 flooding, and alternate CO 2 −hydrocarbon gas injection. ② The recovery of crude oil via CO 2 miscible flooding in heterogeneous reservoirs relies on both convective diffusion and miscible mass transfer. Convective diffusion depends mainly on control of the displacement pressure differential and the plugging of preferential seepage channels in high-permeability areas, while miscible mass transfer depends mainly on the swept range of the convective diffusion and the degree of miscibility between CO 2 and crude oil. ③ To improve the recovery efficiency of CO 2 miscible flooding in heterogeneous reservoirs, it is necessary to choose an injection method that optimizes these two aspects.

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“…Especially, it has strong heterogeneity in low-permeability reservoirs. Gas channeling occurs due to the low viscosity of CO 2 and strong heterogeneity in reservoirs, which causes an ineffective cycle of CO 2 and low efficiency during CO 2 flooding and storage. , In order to solve gas channeling and improve the displacement and storage efficiency of CO 2 , a variety of gas channeling control agents are applied in oilfields. Currently, the main agents for gas channeling control include foam, gel, performed particle gel (PPG), and so on. − Foam has high apparent viscosity and a Jiamin effect, which makes it have good plugging performance in heterogeneous reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Coalescence Behavior of a CO₂-Resistant Dispersed Particle Gel (SCDPG) in Supercritical CO₂

et al. 2023

Energy Fuels

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The reservoir heterogeneity and unfavorable oil/gas mobility ratio lead to gas channeling and low CO2 sweep efficiency during CO2 flooding in low-permeability reservoirs. A dispersed particle gel (DPG) could migrate deep into the reservoir and coalesce, which has the potential for CO2 gas channeling control. In this work, a CO2-resistant bulk gel was prepared by a cross-linking reaction of a copolymer with acid-resistant groups and catechol–hexamethylenetetramine, which exhibited excellent CO2 resistance. Subsequently, a CO2-resistant dispersed particle gel (SCDPG) used in supercritical CO2 was successfully prepared from the CO2-resistant bulk gel by a high-speed mechanical shearing method. Meanwhile, the coalescence behavior of the SCDPG particles in supercritical CO2 was systematically investigated from the microstructure, particle size, ζ potential, and mechanical strength. The results showed that the SCDPG particles were dispersed in the liquid phase as a single particle. SCDPG had good dispersion stability during storage and injection. In supercritical CO2, the dispersion stability of SCDPG decreased, and the particles coalesced with each other to form aggregates with a stereostructure instead of degradation. The SCDPG particles maintained high mechanical strength, showing the long-term effectiveness for gas channeling control during CO2 flooding. In addition, the interparticle force of SCDPG particles was measured by an AFM colloid probe based on the reservoir characteristics. The interparticle force of SCDPG particles changed from repulsion to adhesion with increasing salinity. At a salinity of 0.5 mol/L, the adhesion force increased with the increase of temperature and the decrease of the pH value. According to the type of intermolecular force, the adhesion force originated from the hydrogen bond, π–π stacking, and cation−π interaction. This work provides theoretical support for the field application of the dispersed particle gel and promotes the development of utilization of carbon dioxide in oilfields.

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Study on the migration law of CO2 miscible flooding front and the quantitative identification and characterization of gas channeling

Cited by 14 publications

References 19 publications

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Study on Enhanced Oil Recovery Mechanism of CO₂ Miscible Flooding in Heterogeneous Reservoirs under Different Injection Methods

Coalescence Behavior of a CO₂-Resistant Dispersed Particle Gel (SCDPG) in Supercritical CO₂

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Study on the migration law of CO2 miscible flooding front and the quantitative identification and characterization of gas channeling

Cited by 14 publications

References 19 publications

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO2 Miscible Flooding under Multiphysics Field Coupling Conditions

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO2 Miscible Flooding under Multiphysics Field Coupling Conditions

Study on Enhanced Oil Recovery Mechanism of CO2 Miscible Flooding in Heterogeneous Reservoirs under Different Injection Methods

Coalescence Behavior of a CO2-Resistant Dispersed Particle Gel (SCDPG) in Supercritical CO2

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Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Study on Enhanced Oil Recovery Mechanism of CO₂ Miscible Flooding in Heterogeneous Reservoirs under Different Injection Methods

Coalescence Behavior of a CO₂-Resistant Dispersed Particle Gel (SCDPG) in Supercritical CO₂