Quantitatively study on imbibition of fracturing fluid in tight sandstone reservoir under high temperature and high pressure based on NMR technology

Xu, Rong; Yang, Shenglai; Xiao, Zhipeng; Jin, Yijie

doi:10.1016/j.petrol.2021.109623

Cited by 19 publications

(10 citation statements)

References 43 publications

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“…In recent years, NMR experiments have been widely used in the petroleum industry, especially in the investigation of the pore structure and fluid flow characteristic. ,, The experiment was conducted to investigate the microscopic flow characteristic of nanospheres at the microscale. The pore structure was classified by relaxation time, and the flow characteristic was obtained by the H-signal intensity by NMR …”

Section: Methodsmentioning

confidence: 99%

“…Due to the unclear understanding of the plugging mechanism and flow characteristic of polymer microspheres in the microscale, NMR is widely applied to investigate the pore structure and fluid flow characteristic in porous media. − The basic principle of NMR is to change the hydrogen signal (H-signal) intensity of oil and water by applying a static magnetic field. The fluid flow characteristic can be obtained by the relaxation time (the time taken by polymer solutions to return to their original shape after being disturbed). , An NMR experiment is an effective method to reveal the fluid flow mechanism at the microscale in low-permeability reservoirs .…”

Section: Introductionmentioning

confidence: 99%

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A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Wang

Yang

et al. 2023

Energy Fuels

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Nanospheres have been used as an available plugging material to solve the problem of water intrusion, which is of crucial importance to enhanced oil recovery (EOR). However, the microflow of nanospheres in a lowpermeability reservoir is complex, and its plugging performance and EOR mechanism need to be further investigated by a variety of experiments. In this paper, the expansion experiments were given priority to explore the water absorption and salt tolerance of nanospheres. The displacement experiments were conducted to investigate the plugging performance of nanospheres at the core scale. The flow characteristic and EOR mechanism of nanospheres at the microscale were revealed by nuclear magnetic resonance (NMR) experiments and microfluidic experiments. Expansion and displacement experiments results demonstrate that high salinity inhibits the expansibility and agglomeration of nanospheres, and the formation damage and plugging performance of nanospheres should be comprehensively considered. The suitable particle size of nanospheres should be optimized for field application. As for the microscale, NMR experiments revealed that nanospheres would first enter the large pore and then enter the middle and small pores. In microfluidic experiments, the oil recovery increased by 23.02% original oil in place after the injection of nanospheres. The systematic and comprehensive investigations of expansion property, plugging performance, flow characteristic, and EOR mechanism of nanospheres were conducted from core to microscale, which yielded significant insights into preventing water intrusion and enhancing oil recovery.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Wang

Yang

et al. 2023

Energy Fuels

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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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“…The pore structure of ultra-low-permeability reservoir is very complex, microfractures are developed, and the heterogeneity is strong. Generally, the artificial fractures are formed after fracturing, and the fluid seepage system is complicated [1][2][3][4]. The injected water is prone to water displacement along the fracture and cannot effectively utilize the crude oil in the matrix [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Imbibition Experiment and Main Influence Factors in Ultra-Low-Permeability Reservoirs

et al. 2023

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The imbibition has an important influence on the water injection development of ultra-low-permeability reservoirs. In this paper, the nuclear magnetic resonance (NMR) high-temperature and high-pressure displacement system was used to simulate the formation temperature and pressure and the spontaneous imbibition of single porosity medium and dual porosity medium (containing fractures), and imbibition displacement experiments at different injection rates were carried out. The NMR T2 spectrum curves of simulated oil signals in the pores, throats, and fractures were obtained. The characteristics of oil content change and oil displacement efficiency in dual porosity medium under different experimental conditions were quantitatively evaluated, and the contribution of spontaneous imbibition to oil displacement efficiency was clarified. The experimental results show that the oil displacement efficiency of single porosity medium is lower than that of dual porosity medium. The smaller the pore is, the greater the displacement speed is, and the greater the contribution rate of imbibition is. The porosity, permeability, and maximum pore throat radius are positively correlated with the oil displacement efficiency of spontaneous imbibition but are poorly correlated with the oil displacement efficiency of under the dual action of spontaneous imbibition and displacement. The poor correlation also includes the median pressure, maximum mercury saturation, median radius, and displacement rate. Fractures play a positive role in improving oil displacement efficiency.

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Quantitatively study on imbibition of fracturing fluid in tight sandstone reservoir under high temperature and high pressure based on NMR technology

Cited by 19 publications

References 43 publications

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

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

Spontaneous Imbibition Experiment and Main Influence Factors in Ultra-Low-Permeability Reservoirs

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