Influence of reservoir heterogeneity on immiscible water-alternating-CO2 flooding: A case study

Jia, Peifeng; Cui, Chuanzhi; Wu, Zhongwei; Yan, Dawei

doi:10.1016/j.engeos.2023.100272

Cited by 1 publication

(1 citation statement)

References 17 publications

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“…It was generally believed that the CO 2 flooding oil recovery improvement effect exceeding 15% is very significant. The amount of CO 2 injected in conventional oilfield development is generally less than 1 PV . In order to further improve oil recovery, a large amount of CO 2 (1.2 PV) was injected into the reservoir in Jilin Oilfield, China, and the oil recovery was increased by more than 20%, which proved that large PV CO 2 injection technology with small well spacing is an effective means to increase oil production. , Nevertheless, there were also problems or challenges in its application .…”

Section: Introductionmentioning

confidence: 99%

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO₂ Flooding

Zhao,

Wen,

Liu

et al. 2024

Energy Fuels

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After water flooding development in ultralow permeability reservoirs, connected water channels formed under high injection pressure will reduce the effectiveness of oil recovery and CO 2 storage. Based on the geological characteristics of the megaton-scale carbon capture, utilization, and storage (CCUS) project implemented in Changqing Oilfield, we propose an innovative method for characterizing breakthroughs based on the correlation between water and gas breakthrough. We also implement zoning control optimization to achieve the goal of significantly improving oil recovery and CO 2 storage efficiency. Taking the HX block after water flooding development as an example, the production performance of the single well is first analyzed. The well groups with significant differences in average water cut are classified as Class I and Class II. Then, precise breakthrough characterization is completed based on the distribution of water saturation and flow rate multiple. We evaluated the feasibility and development effectiveness of the large PV (pore volume) CO 2 flooding technology through well pattern adjustment, injection−production parameter optimization based on designed exploration and controlled evolution, parameter sensitivity analysis, and miscibility differences among different levels of well groups. According to statistics, over 60% of the well groups have entered the stage of medium-high water cut. After zoning optimization, the oil recovery of the two well groups under large PV CO 2 flooding can increase by more than 25%, and the total storage amount of CO 2 in the whole region is predicted to reach 3 million tons. It is found that high pressure CO 2 injection under a linear infill pattern is more suitable for weak breakthrough well groups and can greatly improve the oil recovery and CO 2 storage efficiency. The injection intensity should be reduced to ensure the effective utilization of CO 2 for strong breakthrough groups. Sensitivity analysis shows that the gas−water slug ratio is the key factor affecting the CO 2 storage effect, so accurate real-time control is needed in the development process. In addition, when water alternating injection is not sufficient to effectively control the CO 2 breakthrough, gas− water gradient slug injection and gel plugging may be a better approach. These results are beneficial for large-scale CCUS engineering applications.

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Section: Introductionmentioning

confidence: 99%

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO₂ Flooding

Zhao,

Wen,

Liu

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

Influence of reservoir heterogeneity on immiscible water-alternating-CO2 flooding: A case study

Cited by 1 publication

References 17 publications

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO₂ Flooding

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO₂ Flooding

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Influence of reservoir heterogeneity on immiscible water-alternating-CO2 flooding: A case study

Cited by 1 publication

References 17 publications

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO2 Flooding

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO2 Flooding

Contact Info

Product

Resources

About

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO₂ Flooding

Innovative Zoning Control Techniques for Optimizing a Megaton-Scale CCUS-EOR Project with Large-Pore-Volume CO₂ Flooding