Using propanol as an additive to CO2 for improving CO2 utilization and storage in oil reservoirs

Liu, Yueliang; Rui, Zhenhua; Yang, Tao; Dindoruk, Birol

doi:10.1016/j.apenergy.2022.118640

Cited by 70 publications

(27 citation statements)

References 40 publications

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“…The results show two peaks in the T 2 spectrum of our shale samples, indicating that there are a comparatively small number of fractures in addition to pores. 67,68 The first peak corresponds to T 2 < 5 ms, reflecting the distribution of micropores. Meanwhile, the second peak occurs at around 10 ms with a much smaller relaxation signal amplitude than the first one, reflecting the distribution of mesopores, macropores, and fractures.…”

Section: Resultsmentioning

confidence: 99%

Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Zhu

Lai

2022

Energy Fuels

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Spontaneous imbibition (SI) during the extended shut-in period effectively enhances the production performance of shale gas wells. This study presents an experimental work to evaluate the relationship between SI and microscopic pore structures and assess the dynamics of fluid distributions during imbibition for Longmaxi shale. We conducted imbibition tests on six samples collected from the Longmaxi Shale in Southern Sichuan Basin. Also, we conducted a series of experiments on these six samples to characterize microscopic pore-structure parameters. Correlation analysis indicates that porosity, reservoir quality index, permeability, and average pore radius are among the key pore-structure parameters impacting imbibition recovery of our shale samples. In this study, we also conducted nuclear magnetic resonance (NMR) tests to investigate the dynamics of water distribution during imbibition. The NMR results indicate that the micropores and microfractures in the samples are filled with water earlier compared with macropores and macrofractures. The findings may thus provide new insights into the SI after fracturing operations in shales.

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Section: Resultsmentioning

confidence: 99%

Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Zhu

Lai

2022

Energy Fuels

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“…7−10 Especially, CO 2 flooding can not only greatly improve the oil recovery of low-permeability tight reservoirs but also realize the geological storage of CO 2 . 11−14 For example, Liu et al (2022) proposed dimethyl ether and propanol as efficient agents in assisting conventional CO 2 flooding for oil recovery while increasing CO 2 storage in reservoirs. 15,16 CO 2 -enhanced oil recovery mainly includes reducing viscosity of crude oil, swelling effect of crude oil, wettability alteration, and change of interfacial properties.…”

Section: Introductionmentioning

confidence: 99%

“…11−14 For example, Liu et al (2022) proposed dimethyl ether and propanol as efficient agents in assisting conventional CO 2 flooding for oil recovery while increasing CO 2 storage in reservoirs. 15,16 CO 2 -enhanced oil recovery mainly includes reducing viscosity of crude oil, swelling effect of crude oil, wettability alteration, and change of interfacial properties. 17−19 When the temperature is higher than 31.1 °C and pressure is higher than 7.38 MPa, CO 2 enters a supercritical state.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the CO₂ Flooding Characteristics of Tight Sandstone Reservoirs Using a High-Temperature and -Pressure Visualization Apparatus

Gao

Luo

Xie³

et al. 2022

Energy Fuels

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The microscopic pore structure of tight sandstone reservoirs significantly impacts CO2 flooding characteristics. In this work, two types of realistic sandstone visualization models were selected based on petrophysical properties and the pore structure feature. CO2 flooding experiments under different injection pressures and volumes were carried out using the in-house high-temperature and -pressure visualization flooding system. Then, the characteristics of oil movement and residual oil distribution were quantitatively described and analyzed for two rock types. The results show that the type I model has better physical properties and a more favorable pore structure, thus a higher oil recovery than the type II model. The immiscible CO2 flooding efficiency of the type I model is up to 64.5%. On the other hand, the oil recovery of the type II model increases when the miscible pressure is reached, and the maximum oil recovery is 49.5%. In the high-pressure miscible flooding stage, two types of models have similar oil recovery increments, which are 10.7 and 10.6%, respectively. Additionally, the residual oil distribution varies with the pore structure. The type I model has a small residual oil region and thus a high oil recovery efficiency. In contrast, the residual oil saturation of the type II model is larger, and the final oil recovery decreases. Furthermore, as the injection pressure and volume increase, the residual oil saturation becomes smaller, and oil recovery of both models increases. The occurrence characteristics of residual oil are oil droplet, cluster-shaped residual oil, flake oil, and dead corner oil, and the main influencing factors are capillary force, injection pressure, and pore connectivity.

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“…Bedrock reservoirs are widely distributed worldwide, where hydrocarbons are mainly stored in fractures formed by tectonic movement or dissolution. − When developing this type of reservoirs, hydraulic fracturing can be applied to connect these fractures and generate a fracture network for enhancing the hydrocarbon production. − During hydraulic fracturing, cross-linked guar is normally used to reduce the leak-off of fracturing fluid though natural fractures. , However, the guar has a low hydration rate, which increases the cost of fluid preparation in the field. Meanwhile, as a naturally occurring polymer, the guar has a high content of dissolvable proteins after breaking, which can plug the created fractures and cover the reservoir rock, thus inhibiting the flow of hydrocarbons. − To increase the hydration rate, carboxymethyl groups are grafted on saccharides of guar molecules, which makes the carboxymethyl guar .…”

Section: Introductionmentioning

confidence: 99%

Optimization of Fracturing Fluid and Retarded Acid for Stimulating Tight Naturally Fractured Bedrock Reservoirs

Zhou

et al. 2022

ACS Omega

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In tight naturally fractured bedrock reservoirs, hydrocarbons are typically stored in fractures, where hydraulic fracturing is needed to connect these fractures to the wellbore. The cross-linked gel is used as the fracturing fluid to reduce the fluid leak-off through natural fractures; however, it can cause formation damage due to its high content of residues after breaking. A synthetic polymer is introduced and evaluated that can maintain a high viscosity to minimize the leak-off , while having a low residue content after breaking. To further enhance the conductivity of the created fracture network, acid is applied to etch and roughen the created fracture faces. Because the target reservoir has a complex mineral composition, a three-step coreflood sequence using reservoir rock samples with controlled fracture widths is established to quantify the enhancement of different retarded acids and to reveal the mechanism behind it. The results indicate the synergy effect of reducing the acid concentration and surfactant adsorption on rock surfaces can lead to an obvious enhancement of the fracture permeability after acidizing, while the mud acid or hydrofluoric acid is not suitable for the target reservoir where concentrations of silicates and clays are relatively high.

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Using propanol as an additive to CO2 for improving CO2 utilization and storage in oil reservoirs

Cited by 70 publications

References 40 publications

Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Experimental Investigation of the CO₂ Flooding Characteristics of Tight Sandstone Reservoirs Using a High-Temperature and -Pressure Visualization Apparatus

Optimization of Fracturing Fluid and Retarded Acid for Stimulating Tight Naturally Fractured Bedrock Reservoirs

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Using propanol as an additive to CO2 for improving CO2 utilization and storage in oil reservoirs

Cited by 70 publications

References 40 publications

Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Experimental Investigation of the CO2 Flooding Characteristics of Tight Sandstone Reservoirs Using a High-Temperature and -Pressure Visualization Apparatus

Optimization of Fracturing Fluid and Retarded Acid for Stimulating Tight Naturally Fractured Bedrock Reservoirs

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Experimental Investigation of the CO₂ Flooding Characteristics of Tight Sandstone Reservoirs Using a High-Temperature and -Pressure Visualization Apparatus