Effect of supercritical CO<sub>2</sub> flooding on the produced water quality and performance of the scale inhibitors in a typical tight sandstone oilfield

Cui, Kaixiang; Xia, Yufei; Tian, Lei; Wang, Shuai; He, Yongyao

doi:10.1080/10916466.2022.2032150

Cited by 2 publications

(3 citation statements)

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“…The displacement device is used to simulate the reservoir conditions under a certain temperature and pressure. During the experiment, the pumping sequence of field working fluid is simulated, mainly including the base fluid (simulated formation water), acidizing treatment fluid and base fluid. , The effect of acidizing plug removal is evaluated by observing the changes of core permeability before and after acidizing treatment. The schematic diagram of the device used in the displacement test is shown in Figure .…”

Section: Materials and Methodsmentioning

confidence: 99%

Laboratory Evaluation of a Low-Damage Authigenic Mud Acid System for Bai-823 Well Block

Ni,

Cao,

et al. 2023

ACS Omega

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Aiming at the problem of single and poor adaptability of Bai-823 plugging removal system, an authigenic mud acid system using methyl formate, ammonium chloride, and ammonium fluoride as raw materials is proposed, which can adapt to the temperature of 60–80 °C of the target reservoir and sandstone lithology. The acid-generating capacity of the authigenic acid system at different temperatures was evaluated. The results showed that the H + concentration remained at 3.35 mol/L after 180 min at 80 °C, which indicated that authigenic acid could generate acid continuously and thus be competent for acidizing and plugging removal of further wells. The corrosion rate of authigenic acid to N80 steel was further investigated. When 2 wt % SA1-3B corrosion inhibitor was used, the corrosion rate was only 0.15 g/(m 2 ·h). At the same time, the corrosion capacities of authigenic acid to rock core and scale samples were studied, which were 19.38 and 93.81%, respectively, indicating that the authigenic acid system realized pipeline and reservoir friendliness when it was able to effectively remove plugging. Finally, a core displacement experiment was carried out to simulate reservoir acidizing for plugging removal. The results showed that the core permeability increased from 1.00 to 1.63 after acidizing modification with authigenic acid. All of the above studies show that a kind of authigenic mud acid has been successfully prepared, and a new idea for the authigenic acid system has been proposed.

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Section: Materials and Methodsmentioning

confidence: 99%

Laboratory Evaluation of a Low-Damage Authigenic Mud Acid System for Bai-823 Well Block

Ni,

Cao,

et al. 2023

ACS Omega

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“…Moreover, carbon capture, utilization, and storage (CCUS) have garnered substantial attention all over the word. − CO 2 injection, owing to its distinctive physical and chemical properties and relatively cost-effective implementation, has found widespread application in oil reservoirs. − Notably, CO 2 injection serves not only to enhance oil recovery but also to facilitate CO 2 geological storage. , The mechanisms underlying CO 2 -enhanced oil recovery predominantly encompass viscosity reduction, light oil extraction, and alteration of oil–gas interfacial tension. − When pressure surpasses 7.4 MPa and temperature exceeds 31.26 °C, CO 2 transitions into a supercritical state, exhibiting low viscosity, high density, remarkable swelling capacity, and diffusion capabilities. Consequently, the implementation of supercritical CO 2 can significantly enhance oil recovery. , …”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the implementation of supercritical CO 2 can significantly enhance oil recovery. 28,29 Currently, CO 2 injection development technologies primarily encompass CO 2 flooding and CO 2 huff-n-puff. CO 2 flooding can be classified into different categories, including immiscible flooding, near-miscible flooding, miscible flooding, and carbonated water flooding.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Production Characteristics of Huff-n-Puff after CO₂ Flooding in Tight Oil Sandstone Reservoirs

Xue,

Gao,

Wen

et al. 2023

Energy Fuels

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This study aims to investigate the impact of CO2 huff-n-puff after CO2 flooding on recovery efficiency in tight sandstone reservoirs. The experimental methodology involved the selection of three representative cores with different permeability levels to emulate class I, II, and III reservoirs. To examine immiscible, nearly miscible, and miscible conditions for different reservoir samples, a physical simulation flow system integrated with nuclear magnetic resonance technology was employed. CO2 flooding was performed followed by CO2 huff-n-puff experiments at five pressures, enabling a quantitative analysis of oil production characteristics in various pores during the flooding and huff-n-puff processes. This study provides insights into the microscopic production characteristics and oil recovery influenced by huff-n-puff in tight sandstone reservoirs subsequent to CO2 flooding. The experimental results highlight that recovery efficiency increases with higher permeability, with class I reservoir samples exhibiting the highest recovery rate at 76.47%, followed by class II reservoirs at 69.33%, and class III reservoirs at 44.43%. Huff-n-puff recovery for class I and class II reservoirs gradually declines with increasing pressure after flooding, whereas class III reservoirs display an opposite trend, with recovery gradually increasing. In addition, the microscopic oil distribution characteristics change after flooding. During the near-miscible phase, class I and class III reservoirs predominantly yield oil from medium and small pores, while class II reservoirs primarily produce oil from medium pores. Upon reaching miscibility, oil production in class I, II, and III reservoirs primarily occurs in small pores, with some contribution from medium pores. The research findings presented in this paper provide valuable theoretical support for future CO2 flooding operations in tight sandstone reservoirs and the optimization of huff-n-puff experiments subsequent to flooding.

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Effect of supercritical CO₂ flooding on the produced water quality and performance of the scale inhibitors in a typical tight sandstone oilfield

Cited by 2 publications

References 20 publications

Laboratory Evaluation of a Low-Damage Authigenic Mud Acid System for Bai-823 Well Block

Laboratory Evaluation of a Low-Damage Authigenic Mud Acid System for Bai-823 Well Block

Microscopic Production Characteristics of Huff-n-Puff after CO₂ Flooding in Tight Oil Sandstone Reservoirs

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Effect of supercritical CO2 flooding on the produced water quality and performance of the scale inhibitors in a typical tight sandstone oilfield

Cited by 2 publications

References 20 publications

Laboratory Evaluation of a Low-Damage Authigenic Mud Acid System for Bai-823 Well Block

Laboratory Evaluation of a Low-Damage Authigenic Mud Acid System for Bai-823 Well Block

Microscopic Production Characteristics of Huff-n-Puff after CO2 Flooding in Tight Oil Sandstone Reservoirs

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Effect of supercritical CO₂ flooding on the produced water quality and performance of the scale inhibitors in a typical tight sandstone oilfield

Microscopic Production Characteristics of Huff-n-Puff after CO₂ Flooding in Tight Oil Sandstone Reservoirs