Enhancing CO2 huff-n -puff strategies for improved oil recovery in the Bakken formation: A numerical simulation approach

IF 5.5 Q2 ENERGY & FUELS

Petroleum Pub Date : 2026-04-01 Epub Date: 2026-03-10 DOI:10.1016/j.petlm.2026.02.004

Saddam Mohammed Mohammed Nasser, Vivek Ramalingam, N. Madhavan

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引用次数: 0

Abstract

This study investigates the performance of various huff and puff (HnP) strategies for enhanced oil recovery (EOR) in the Sanish field of the Bakken formation, using a numerical model developed with CMG software. The model integrates PVT validation, CO₂ miscibility, swelling tests, heterogeneity, and history matching with field data. Several HnP strategies, including Supported (S HnP), Alternative Supported (AS HnP), and Alternative Zigzag Supported (AZS HnP), were evaluated. Key findings show that dual porosity and permeability are essential for accurate modeling, while CO₂ diffusion has minimal impact in field-scale simulations with high fracture spacing. The S HnP strategy improves oil recovery with 50% less CO₂ than the Normal HnP, and the AS HnP further enhances production. The AZS HnP outperforms both, offering higher oil recovery and better CO₂ utilization. Fracture length was found to influence recovery significantly, and the sensitivity of oil production to CO₂ injection rates was notably higher in the AZS HnP compared to the N HnP scenario. These results highlight the potential for optimized CO₂-EOR strategies in unconventional reservoirs.

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提高Bakken地层CO2吞吐策略以提高采收率：数值模拟方法

本研究利用CMG软件开发的数值模型，研究了Bakken地层Sanish油田提高采收率（EOR）的各种吞吐（HnP）策略的性能。该模型集成了PVT验证、CO2混相、膨胀测试、非均质性以及与现场数据匹配的历史数据。评估了几种HnP策略，包括支持（S HnP），备选支持（AS HnP）和备选之字形支持（AZS HnP）。研究结果表明，双重孔隙度和渗透率对于精确建模至关重要，而CO2扩散对高裂缝间距的现场模拟影响最小。与普通HnP相比，S HnP策略提高了原油采收率，二氧化碳排放量减少了50%，而AS HnP则进一步提高了产量。AZS HnP优于两者，具有更高的原油采收率和更好的二氧化碳利用率。研究发现，裂缝长度对采收率有显著影响，与N - HnP方案相比，AZS HnP方案的产油量对二氧化碳注入速率的敏感性明显更高。这些结果突出了非常规油藏优化CO2-EOR策略的潜力。

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来源期刊

Petroleum Earth and Planetary Sciences-Geology

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

124 days

期刊介绍： Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing