Experimental study on unstable imbibition characteristics of fracturing fluids at high pressures and temperatures in the tight continental reservoir

Xu, Rong; Yang, Shenglai; Li, Meng; Xie, Ping; Dong, Zhuoxin; Zhu, Jiajie; Jin, Yijie; Wang, Xuanyi

doi:10.1016/j.geoen.2022.211362

Cited by 9 publications

(4 citation statements)

References 60 publications

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“…Low-field NMR is recognized as a non-invasive, swift, and precise method for evaluating the characteristics of cores [36,37]. The T 2 value of a core is closely associated with its pore structure, which is evident in the T 2 spectrum.…”

Section: Methods For Quantitatively Evaluate the Effect Of Fluidmentioning

confidence: 99%

“…As capillary forces act in numerous micropores, the oil phase initially present in mesopores is either pushed towards the rock surface or shifts into macropores. During spontaneous imbibition, particularly in scenarios where rock throats exhibit varied size distributions, the simultaneous occurrence of wetting phase imbibition in fine throats and the expulsion of the non-wetting phase from coarse throats is observed [37]. The inflow of the wetting phase into the discharge channels can obstruct these pathways, leading to residual saturation.…”

Section: Characteristics Of Spontaneous Imbibitionmentioning

confidence: 99%

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Investigation of the Combination Mechanism of Spontaneous Imbibition and Water Flooding in Tight Oil Reservoirs Based on Nuclear Magnetic Resonance

Tao,

Wang,

Bai

et al. 2024

Energies

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As conventional oil reservoirs are gradually being depleted, researchers worldwide are progressively shifting their focus towards the development and comprehensive study of tight oil reservoirs. Considering that hydraulic fracturing is one of the main approaches for developing tight sandstone reservoirs, it is of great significance to explore the mechanism of spontaneous imbibition and waterflooding behavior after hydraulic fracturing in tight oil reservoirs. This research delves into the analysis of tight sandstone core samples obtained from the Shahejie Formation in the Bohai Bay Basin. All core samples are used for a series of experiments, including spontaneous imbibition and water flooding experiments. An additional well-shut period experiment is designed to understand the impact and operational dynamics of well shut-in procedures in tight reservoir development. Utilizing nuclear magnetic resonance (NMR) technology, the pore sizes of a sample are divided into three types, namely, macropores (>100 ms), mesopores (10–100 ms), and micropores (<10 ms), to thoroughly assess the fluid distribution and changes in fluid signals during the spontaneous imbibition and water flooding stages. Experimental outcomes reveal that during the spontaneous imbibition stage, oil recovery ranges from 12.23% to 18.70%, predominantly depending on capillary forces. The final oil recovery initially rises and then falls as permeability decreases, while the contribution of micropores progressively grows as the share of mesopores and macropores deceases. With water flooding processes carried out after spontaneous imbibition, enhanced oil recovery is observed between 28.26% and 33.50% and is directly proportional to permeability. The well shut-in procedures can elevate the oil recovery to as high as 47.66% by optimizing energy balance.

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Section: Methods For Quantitatively Evaluate the Effect Of Fluidmentioning

confidence: 99%

Section: Characteristics Of Spontaneous Imbibitionmentioning

confidence: 99%

Investigation of the Combination Mechanism of Spontaneous Imbibition and Water Flooding in Tight Oil Reservoirs Based on Nuclear Magnetic Resonance

Tao,

Wang,

Bai

et al. 2024

Energies

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“…With the large-scale application of “long horizontal wells, volume fracturing, and industrial operation modes”, as well as breakthroughs in different types of tight oil development technologies such as low-pressure, low-pore, low-quality, and low filling, China’s predicted peak tight oil production can reach 28–35 million tons. − The development potential of China’s tight oil resources is enormous and will have significant social and economic benefits.…”

Section: Global Tight Oil Resources and Distributionmentioning

confidence: 99%

Review of the Development Status and Technology of Tight Oil: Advances and Outlook

Liu

2023

Energy Fuels

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Tight sandstone and shale oil reservoirs are one of the most promising and realistic important oil exploration fields in the 21st century. The research on the development technology of tight sandstone and shale oil reservoirs has important theoretical and practical significance for the exploration and development of tight sandstone and shale oil reservoirs in China. First, this article introduces the distribution of tight oil in the world and calculates the recoverable reserves of tight oil technology worldwide. The review also introduces the current status of tight oil exploration and development in major countries such as the United States, Canada, and China, including the distribution of tight oil resources, the main parameters of tight oil basins, and tight oil production. Second, it analyzes the current development status of tight oil in the United States, summarizes the four main factors that led to the success of tight oil exploration and development in the United States, and points out the impact of the successful development of tight oil in the United States on the global oil supply and demand relationship. Third, in the review of the main development technologies for tight oil, the current status, application, and progress of the main development technologies for tight oil are summarized and analyzed, including horizontal well drilling, fracturing and transformation technology, microscale seismic diagnosis, gas injection, and other technologies. Finally, the development examples of tight oil such as the Bakun shale in the United States are analyzed, and the application effects and experiences of horizontal well volume fracturing in regions such as the United States are summarized.

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“…Zhang et al explored the impact of pore structure on imbibition under varied boundary conditions. Their findings suggest that mesopores yield better imbibition due to their higher capillary pressure than macropores. − Jia et al examined the restoration of micropores, mesopores, and macropores throughout the spontaneous imbibition procedure using NMR scans. The findings of the research indicated that oil displacement through imbibition initially took place across micropores and then subsequently with macropores and mesopores during entire procedure.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Imbibition Diffusion and Recovery Enhancing of Fracturing Fluids in Tight Reservoirs

Zhang,

Yu,

Tang

et al. 2024

Energy Fuels

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Spontaneous imbibition is an essential method to enhance recovery during fracturing shut-in of tight reservoirs. However, most of the investigations are primarily focused on the mechanism of water imbibition to enhance recovery; the mechanism of fracturing fluid to enhance recovery and the lower limit of imbibition flow are remained insufficiently investigated. This paper identifies the pore structure characteristic of tight reservoirs, the fracturing fluid imbibition, and the lower limit of imbibition flow by combining nuclear magnetic resonance and high-pressure mercury intrusion methods, clarifying the mechanism of fracturing fluid recovery enhancement. The core-scale super diffusion model of fracturing fluid was established, and the sensitivity analysis of imbibition-influencing factors was conducted. The experimental results indicated that high interfacial tension increased the driving force and decreased the lower limit of imbibition flow, while low interfacial tension decreased the crude oil flow resistance and increased the lower limit of imbibition flow. The imbibition recovery improved with the increase of matrix permeability and decreased with the increase of crude oil viscosity. The degree of mobilization of micropores decreases and the degree of mobilization of mesopores with macropores increases with decreasing interfacial tension. The increase in matrix permeability elevated the degree of mobilization of each pore, while the increase of crude oil viscosity decreased the reduction of each pore. The simulation results fitted well with the experimental data, verifying the reasonableness of the model. The results indicated that the imbibition recovery was positively correlated with the characteristic parameters of the capillary force and negatively correlated with the core length and the viscosity of the fracturing fluid. The investigation in this paper provides a new theoretical basis for the improvement of recovery in tight reservoirs.

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Experimental study on unstable imbibition characteristics of fracturing fluids at high pressures and temperatures in the tight continental reservoir

Cited by 9 publications

References 60 publications

Investigation of the Combination Mechanism of Spontaneous Imbibition and Water Flooding in Tight Oil Reservoirs Based on Nuclear Magnetic Resonance

Investigation of the Combination Mechanism of Spontaneous Imbibition and Water Flooding in Tight Oil Reservoirs Based on Nuclear Magnetic Resonance

Review of the Development Status and Technology of Tight Oil: Advances and Outlook

Mechanisms of Imbibition Diffusion and Recovery Enhancing of Fracturing Fluids in Tight Reservoirs

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