Dynamic and static imbibition characteristics of tight sandstone based on NMR

Ren, Wendong; Ma, Chunfeng; Huang, Xiangping; Gu, Weizhong; Chen, Yan; Lu, Xin

doi:10.1016/j.geoen.2023.212052

Cited by 5 publications

(7 citation statements)

References 28 publications

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“…Physical properties characterize the reservoir storage space and seepage space. In the process of spontaneous imbibition, micropores and mesopores are the main imbibition spaces, while macropores, as seepage channels, contribute less to imbibition . According to the relationship between porosity, permeability, and imbibition efficiency (Figure a), it can be seen that permeability has a high correlation with imbibition efficiency ( R 2 = 0.6422), that is, permeability has a great influence on reservoir imbibition efficiency.…”

Section: Discussionmentioning

confidence: 98%

Imbibition Characteristics and Influencing Factors of the Fracturing Fluid in a Tight Sandstone Reservoir

Li,

Ren,

Sun

et al. 2024

ACS Omega

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The strong reservoir heterogeneity and complex microscopic pore structure in the Linxing area make it prone to water block damage during imbibition development. In order to explore the influence of reservoir microscopic characteristics on imbibition efficiency, taking the tight sandstone gas reservoir in the Linxing area of Ordos Basin as an example, the heterogeneity of the tight sandstone reservoir in the study area is characterized in terms of physical and chemical characteristics as well as the microscopic pore structure. Using nuclear magnetic resonance, high-pressure mercury pressure, and other testing methods, spontaneous seepage experiments in real sandstone were carried out to study the distribution law of different pore structures and seepage characteristics at different times and to systematically evaluate the microscopic pore characteristics of dense sandstone reservoirs and the factors affecting seepage and suction. The results show that due to the strong microscopic heterogeneity of tight sandstone, the macroscopic properties cannot directly reflect the microscopic characteristics, and the response to imbibition efficiency is stronger. The pore size is the main controlling factor affecting imbibition, and the contribution rate of the micropore and mesopore mainstream pore size spaces is higher than that of the macropore. Micropores provide imbibition power, and mesopores provide an imbibition interval. High-porosity and high permeability reservoirs are more conducive to imbibition replacement. The intercrystalline pores have a great influence on the imbibition efficiency, and the influence of intergranular pores and dissolution pores on the imbibition cannot be underestimated. The smaller the relative sorting coefficient, interfacial tension, and contact angle, the better the imbibition effect of fracturing fluid. Research results have theoretical guiding significance for spontaneous imbibition to improve oil recovery.

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Section: Discussionmentioning

confidence: 98%

Imbibition Characteristics and Influencing Factors of the Fracturing Fluid in a Tight Sandstone Reservoir

Li,

Ren,

Sun

et al. 2024

ACS Omega

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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%

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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“…Imbibition is a widely observed phenomenon in many natural science fields, which refers to the process of capillary absorption of a wetting phase liquid under the action of capillary force . It can be divided into static imbibition and dynamic imbibition, depending on whether the imbibition fluid is flowing or stationary. Static imbibition typically refers to the penetration of liquids into a porous media without distinct external driving forces, such as gravity or pressure differentials. , On the other hand, dynamic imbibition usually involves the penetration of liquids into a porous media with a specific velocity, often due to external driving forces, such as pressure differentials. , In recent years, numerous scholars have dedicated significant research efforts to static and dynamic imbibition experiments.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Harimi et al utilized limestone and sandstone core plug samples and a laboratory-simulated matrix fracturing system to investigate the dynamic imbibition mechanism in the presence of fracturing fluid flow. Ren et al employed nuclear magnetic resonance (NMR) techniques in combination with imbibition experiments to analyze the fluid distribution and fluid signal variations within rock core pores during both dynamic and static imbibition processes. Additionally, imbibition can be further classified into cocurrent and counter-current imbibition, depending on the flow direction of the wetting phase and the nonwetting phase. − Capillary force is the main driving force for oil displacement and cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

“…14−16 Imbibition is a widely observed phenomenon in many natural science fields, which refers to the process of capillary absorption of a wetting phase liquid under the action of capillary force. 17 It can be divided into static imbibition 18 and dynamic imbibition, 19 depending on whether the imbibition fluid is flowing or stationary. Static imbibition typically refers to the penetration of liquids into a porous media without distinct external driving forces, such as gravity or pressure differentials.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Surfactant-Aided Dynamic Spontaneous Imbibition in Tight Oil Reservoirs: The Effect of Fluid Flow, Displacement Pressure, Temperature, and Fracture

Wang,

Zeng,

Wang

et al. 2023

Energy Fuels

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Spontaneous imbibition has emerged as a crucial mechanism for enhancing oil recovery in tight oil reservoirs. However, most of the existing spontaneous imbibition experiments have been static in nature. The dynamic effects of fluid flow, fluid type, displacement pressure, and fractures on the imbibition oil recovery have not been adequately addressed in previous studies. To fill this gap in knowledge and gain a comprehensive understanding of the mechanisms underlying surfactant-aided dynamic spontaneous imbibition, we conducted a series of experiments on tight cores extracted from the Chang 8 formation in the Ordos Basin in Northwest China. The experiments comprised static imbibition, dynamic imbibition, and water flooding displacement, and the impacts of fractures, temperature, type of imbibition fluid, and flow rate on imbibition recovery were analyzed. The results of the experiments showed that fractures have a significant impact on the imbibition oil recovery rate, with the ultimate recovery factor of the fractured core ranging from 16 to 29%, which is higher than that of the matrix core. Dynamic imbibition, on average, resulted in a recovery of 16%, which was higher than that with static imbibition. The use of surfactant solutions enhanced the oil recovery of cores, particularly in dynamic imbibition processes. This was attributed to the acceleration of emulsification between surfactants and crude oil, which led to an increased imbibition rate and oil recovery factor. Displacement was found to be an effective method for recovering the oil not produced through imbibition. The total oil recovery factors of the core samples after imbibition and displacement are in the ranges of 25% and 61%. This study is aimed at investigating the underlying mechanisms of various imbibition processes and examining the influence of various factors on the efficiency of spontaneous imbibition, with the ultimate goal of recovery enhancement in tight oil reservoirs.

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Dynamic and static imbibition characteristics of tight sandstone based on NMR

Cited by 5 publications

References 28 publications

Imbibition Characteristics and Influencing Factors of the Fracturing Fluid in a Tight Sandstone Reservoir

Imbibition Characteristics and Influencing Factors of the Fracturing Fluid in a Tight Sandstone Reservoir

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

Experimental Study of Surfactant-Aided Dynamic Spontaneous Imbibition in Tight Oil Reservoirs: The Effect of Fluid Flow, Displacement Pressure, Temperature, and Fracture

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