Experimental and model analysis on shale spontaneous imbibition and its influence factors

Ding, Yi; Liu, Xiangjun; Liang, Lixi; Xiong, Jian; Hou, Lianlang

doi:10.1016/j.jngse.2022.104462

Cited by 23 publications

(6 citation statements)

References 46 publications

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“…The driving force for water SI is mainly capillary force. , According to Washburn’s equation, the SI of water in microfractures is significantly weaker than that in pores. If we do not consider the mercury contained in anthracite fractures, the volume of mercury invading the anthracite sample pores is much smaller than that of bituminous coal, indicating that large-volume pores in anthracite are less developed than those in bituminous coal.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Study of the Effects of Pore Structure and Wettability on the Water Spontaneous Imbibition Behaviors in Coal

Xu,

Zhai

et al. 2023

Energy Fuels

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Water injection has been widely used to prevent gas disasters and coal dust in coal mines. Coal would be wetted and softened by water through spontaneous imbibition (SI), which is mainly influenced by the pore structure and wettability. Studying the effects of pore structure and wettability on SI is of great significance for optimizing coal seam water injection parameters. This work aims to establish a quantitative relationship between these parameters and extract critical factors controlling the SI. Mercury intrusion porosimetry (MIP), low-temperature N 2 adsorption (LT-N 2 A), Fourier transform infrared spectroscopy (FTIR), and contact-angle measurements were used to assess the pore structure and wettability of the coal samples. Low-field nuclear magnetic resonance (LF-NMR) was used to monitor water in coal. All parameters were quantified with Pearson correlation analysis, and principal component analysis (PCA) was subsequently employed to pinpoint the key factors. The results show that the SI velocity and SI ability of bituminous coal are higher than those of anthracite; bituminous coal can rapidly elute more water. The time index (n) has a strong relationship with the SI velocity, and the higher the n value is, the faster the water migrates in pore space. Porosity is positively proportional to SI ability, and a larger SI ability means that the sample can store more water. The wettability parameter has a higher impact on SI velocity than on SI ability. Among the wettability parameters, the contact angle is a key factor in evaluating the SI process in coal. The bituminous coal with good pore connectivity, hydrophilicity, and high porosity could have a rapid SI velocity and store more water. Oxygen-containing functional groups promote SI by enhancing water and pore surface interactions. This work can better understand the mechanism of SI and provide the theoretical basis for field application.

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Section: Resultsmentioning

confidence: 99%

Quantitative Study of the Effects of Pore Structure and Wettability on the Water Spontaneous Imbibition Behaviors in Coal

Xu,

Zhai

et al. 2023

Energy Fuels

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“…Imbibition, driven by capillary forces, is where the wetting phase enters the pore, displacing the non-wetting phase. This process is crucial in determining the degree of oil production and recovery in tight oil reservoirs [19][20][21]. Spontaneous imbibition depends on the interaction between oil/water/rock multiphase flows.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influencing Factors of Imbibition of Fracturing Fluids in Tight Reservoirs

Liu,

Qu,

Wang

et al. 2024

Processes

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Tight reservoirs are the focus of unconventional oil and gas resource development, but most tight reservoirs exhibit complex pore structures, strong non-homogeneity, and limited water drive development. Fracturing fluid imbibition is a critically important way to improve the recovery of tight reservoirs. In this paper, an NMR experimental device was used to conduct imbibition experiments in tight reservoirs, and the relationship between temperature, pressure, matrix permeability, and imbibition recovery was investigated. Based on the fracturing fluid imbibition recovery curve, the imbibition process is divided into the fast imbibition stage, slow imbibition stage, and imbibition equilibrium. In addition, based on the pore structure division, the recovery changes of each pore under different experimental conditions were quantitatively analyzed. The results indicate that the highest imbibition recovery is achieved at an experimental pressure of 5 MPa within the range of 0 MPa to 15 MPa. Increasing the experimental pressure can increase the imbibition rate but will not increase imbibition recovery. Within the investigated range in this paper, fracturing fluid imbibition increases with rising temperature and matrix permeability. Moreover, the recovery of each pore gradually increases with the experimental pressure ranging from 0 MPa to 5 MPa. The recovery of each pore is positively correlated with matrix permeability and temperature. During the experiment, micropores contributed the most to the recovery, while macropores contributed the least. The study in this paper guides the efficient development of tight reservoirs.

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“…It is believed that the crude oil in tight reservoir matrix flows into fractures mainly by imbibition. Thus, imbibition is considered an important mechanism in the production process (Mattax and Kyte, 1962;Birdsell et al, 2015;Wang et al, 2017Wang et al, , 2019Liu et al, 2022;Saafan et al, 2022;Karimova et al, 2023). As early as the middle of the 20 th century, some countries began to study and apply imbibition in oil exploitation (Graham and Richardson, 1959).…”

Section: Introductionmentioning

confidence: 99%

Study on imbibition during the CO2 enhanced oil recovery in fractured tight sandstone reservoirs

Wang,

Shang,

Guo

et al. 2023

Capillarity

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CO 2 enhanced oil recovery (CO 2 -EOR) is a key technology for improving the oil recovery of fractured tight reservoirs, and imbibition has been recognized as an important mechanism for oil recovery in low-permeability reservoirs. To clarify the imbibition role and influencing factors during the CO 2 -EOR process in fractured tight oil reservoirs and also improve the EOR mechanism, a high-temperature and high-pressure CO 2 imbibition experiment was performed based on the nuclear magnetic resonance technology. The results show that high pressure and high permeability are beneficial to imbibition efficiency. The salinity of the imbibition fluid is not very sensitive to the imbibition recovery. In addition, the CO 2 increases the imbibition speed and can also significantly improve the production rate and oil recovery. It is beneficial to increase the CO 2 concentration to shorten the imbibition equilibrium time and enhance oil recovery. According to the results of the nuclear magnetic resonance study, although the nanopore can provide a greater imbibition force, the oil flow resistance is also larger, but CO 2 can reduce the flow resistance of oil and be conducive to oil production in smaller pores. The inclusion of imbibition into the research category of CO 2 -EOR mechanism will be more in line with field practice and more scientific in fractured tight reservoirs, thus providing theoretical support for the development and improvement of the CO 2 -EOR technology.

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Experimental and model analysis on shale spontaneous imbibition and its influence factors

Cited by 23 publications

References 46 publications

Quantitative Study of the Effects of Pore Structure and Wettability on the Water Spontaneous Imbibition Behaviors in Coal

Quantitative Study of the Effects of Pore Structure and Wettability on the Water Spontaneous Imbibition Behaviors in Coal

Investigating the Influencing Factors of Imbibition of Fracturing Fluids in Tight Reservoirs

Study on imbibition during the CO2 enhanced oil recovery in fractured tight sandstone reservoirs

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