A decomposition method of nuclear magnetic resonance T2 spectrum for identifying fluid properties

Zhong, Jibin; Yan, Ronghui; Zhang, Haitao; Feng, Yihan; Li, Nan; Liu, Xingjun

doi:10.1016/s1876-3804(20)60089-1

Cited by 29 publications

(15 citation statements)

References 4 publications

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“…Figure 4 reveals that the relaxation time of the main peak in the T 2 curve is 2–3 ms. This implies that the liquid is mainly distributed in the micropores in the form of bound water and cannot flow 38 . The peak value increases with time, indicating that most of the liquid exists on the micropore walls or is wrapped around the surface of particles during the capillary rise process.…”

Section: Resultsmentioning

confidence: 99%

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Zhi

Gan

Zhang

et al. 2022

Sci Rep

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Capillary penetration is widely existed in stope leaching, both the rate of liquid wetting ore and flow out of ore are affected by it. Stope leaching is carried out in a high-temperature environment when mining minerals with large burial depth. The mechanism of intra-particle liquid capillary penetration mechanisms at high-temperature have not been revealed. In this paper, samples with a size of Φ50 mm × 100 mm were selected for quantitative analysis. The capillary rise behaviour inside samples with different porosity were detected at 30 °C, 40 °C and 50 °C by using magnetic resonance imaging (MRI). In most cases, capillary rise height is underestimated when the outside wetting line is used as an indicator, because the rise height inside the sample is greater. The liquid capillary rise height increased slightly with the temperature, whereas the wetting surface profile remained unchanged. The capillary rise rate increased significantly with porosity, mainly due to the increase of internal effective porosity. The results help to understand the liquid penetration behaviour under high-temperature stope leaching condition, and lay a theoretical foundation for improving the liquid permeability.

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Section: Resultsmentioning

confidence: 99%

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Zhi

Gan

Zhang

et al. 2022

Sci Rep

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“…Capillary bound water is liquid water in nanoscale pores. If the water content of the sample is high, liquid water also gathers in large pores and cracks, which can move freely, so it is called free water . Since the liquid water in shale is distributed in pores or on the surface of pores, their distribution position can be changed, so we can call the liquid water in shale as mobile water, which directly affects the adsorption and migration of methane.…”

Section: Discussionmentioning

confidence: 99%

Water Occurrence Characteristics of Gas Shale Based on 2D NMR Technology

Shen

et al. 2021

Energy Fuels

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Determination of water occurrence in gas shale reservoirs is vital for understanding the gas storage and migration behavior. Clay, kerogen, and shale samples with different water contents were analyzed based on the 2D NMR technology to decipher the characteristic of water occurrence in different shale compositions. By establishing a new classification method of water in shale, the water absorption characteristics of shale during hydraulic fracturing and the law of water mobilization in shale reservoirs during development are quantitatively analyzed. The results suggest that the water in shale can be classified as mobile water and immobile water, with the boundary T 1 = 0.1 ms. The mobile water can be further divided into clay bound water, capillary bound water, and free water by the T 1 −T 2 map. Most of the water in shale is clay bound water, which is also the most important object in the study of fracturing fluid retention. The influence of free water and clay bound water on the gas−water two-phase flow of shale is greater. Accurate analysis of different types of water in shale can clarify their different effects on methane occurrence and migration. This study overcomes the shortcomings of inaccurate quantitative analysis of water in shale by traditional methods and provides help for the analysis of fracturing fluid retention law and the development effect of gas wells.

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“…The water phase in gas reservoirs can be categorized to two types, mobile water and residual water (Zhong et al, 2020). The mobile water is a kind of liquid phase which could be driven to flow under certain conditions.…”

Section: The Mode Of Water Storage In Tight Sandstone Gas Reservoirsmentioning

confidence: 99%

The investigation of microporous structure and fluid distribution mechanism in tight sandstone gas reservoirs: A case study on the second member of Xujiahe gas reservoirs in Yuanba area

Guo

Fu²,

Li³

et al. 2022

Front. Energy Res.

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Tight sandstone reservoir is characterized by ultra-low porosity, complex microporous structure and water residues, which shows different gas storage and transport mechanism from conventional reservoirs. Therefore, effective development of tight sandstone gas reservoirs is faced with technical challenges. Microporous structures, distribution mechanism of fluid is a basic issue in gas reservoir evaluation. In this work, we take gas reservoir in the 2nd member of Xujiahe Formation in Yuanba area as an example to analyze the microscopic feature of pore structure and fluid distribution. The three-dimensional digital core has been applied to represent the real microporous structure. Specifically, a digital core reconstruction method based on SEM and casting slice images has been proposed. Ultimately, the mechanism of distribution, mode of occurrence of water residues in tight sandstone reservoirs has been simulated and quantitatively analyzed. The results show that the water residues could been visualized and categorized into three modes, water mass in corner, water film on surface, and water column in throat. The water residues could cause dramatic influence on pore structures, active pore size could be decreased with rising residual water saturation, the magnitude falls by over 50%. In addition, grain size would affect the distribution of water residues, which shows different percentage in medium and fine sand. Pore connectivity is another characteristic factor to describe the microporous structures. In this study, cluster marking algorithm has been applied to obtain the pore connectivity in tight sandstone with different grain size. In medium sand, the pore connectivity is dramatically decreased with rising water saturation, the downward trend become slower when water saturation reaches to 60%. Compared to fine sand, the tendency variation appears when water saturation reaches to 40%. This paper provides an applicable method to reveal the micro-scale reservoir properties and fluid distribution mechanisms in tight sandstone gas reservoirs.

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A decomposition method of nuclear magnetic resonance T2 spectrum for identifying fluid properties

Cited by 29 publications

References 4 publications

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Water Occurrence Characteristics of Gas Shale Based on 2D NMR Technology

The investigation of microporous structure and fluid distribution mechanism in tight sandstone gas reservoirs: A case study on the second member of Xujiahe gas reservoirs in Yuanba area

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