Pore-scale investigation of microscopic remaining oil variation characteristics in water-wet sandstone using CT scanning

Li, Junjian; Jiang, Hanqiao; Wang, Chuan; Zhao, Yuyun; Gao, Yajun; Pei, Yanli; Wang, Chenchen; Hu, Dong

doi:10.1016/j.jngse.2017.04.003

Cited by 93 publications

(39 citation statements)

References 27 publications

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“…Meanwhile the oil clusters in various forms have different volume. In order to better describe the different types of remaining oil, the method proposed by Li has been adopted to divide the remaining oil into five categories [36], clustered, multiporous, columnar, droplet, and membranous; see Figure 9. The five categories of oil clusters have different values of volume, surface area, occurrence pore throat ratio, and contact area, which can be quantitatively characterized according to the shape factor, Euler number, and the pore throat contact relationship.…”

Section: Cluster Morphologies and Classificationmentioning

confidence: 99%

Pore-Scale Imaging of the Oil Cluster Dynamic during Drainage and Imbibition Using In Situ X-Ray Microtomography

Gao

Jiang

et al. 2018

Geofluids

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We imaged water-wet and oil-wet sandstones under two-phase flow conditions for different flooding states by means of X-ray computed microtomography ( CT) with a spatial resolution of 2.1 m/pixel. We systematically study pore-scale trapping of the nonwetting phase as well as size and distribution of its connected clusters and disconnected globules. We found a lower or , 19.8%, for the oil-wet plug than for water-wet plug (25.2%). Approximate power-law distributions of the water and oil cluster sizes were observed in the pore space. Besides, the value of the wetting phase gradually decreased and the nonwetting phase gradually increased during the core-flood experiment. The remaining oil has been divided into five categories; we explored the pore fluid occupancies and studied size and distribution of the five types of trapped oil clusters during different drainage stage. The result shows that only the relative volume of the clustered oil is reduced, and the other four types of remaining oil all increased. Pore structure, wettability, and its connectivity have a significant effect on the trapped oil distribution. In the water sandstone, the trapped oil tends to occupy the center of the larger pores during the water imbibition process, leading to a stable specific surface area and a gradually decreasing oil capillary pressure. Meanwhile, in oil-wet sandstone, the trapped oil blobs that tend to occupy the pores corner and attach to the walls of the pores have a large specific surface area, and the change of the oil capillary pressure was not obvious. These results have revealed the well-known complexity of multiphase flow in rocks and preliminarily show the pore-level displacement physics of the process.

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Section: Cluster Morphologies and Classificationmentioning

confidence: 99%

Pore-Scale Imaging of the Oil Cluster Dynamic during Drainage and Imbibition Using In Situ X-Ray Microtomography

Gao

Jiang

et al. 2018

Geofluids

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“…5 and Fig. 7, in order to analyze the type of remaining oil and the effect of displacement, the remaining oil during the displacement process was classified into five types from hard-to-produce to easy-to-produce: Membranous flow (in the blue areas), droplet flow (in the red areas), columnar flow (in the cyan areas), multi-porous flow (in the yellow areas), and clustered flow (purple area), by using Li's classification method (Li et al, 2017(Li et al, , 2018 and related software.…”

Section: Water/polymeric Surfactant Flooding Experimentsmentioning

confidence: 99%

Displacement mechanism of polymeric surfactant in chemical cold flooding for heavy oil based on microscopic visualization experiments

Chen

et al. 2020

Adv. Geo-Energ. Res.

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“…With the advance of X-ray micro-computed tomography technique, it has become much more feasible to perform flow experiments on the scanning stage of imaging facility without disturbing fluid flow from transportation (Sheppard et al, 2014). For pore-scale multiphase flow obtaining spatial fluid distributions and saturations at the steady-state or quasi-static state during immiscible displacement, drainage/imbibition for capillary pressure or relative permeability measurement are burgeoning topics that have been widely discussed (Turner et al, 2004;Youssef et al, 2010;Reynolds and Krevor, 2015;Gao et al, 2017;Li et al, 2017;Reynolds et al, 2017). For multiphase flow experiments combined with X-ray microcomputed imaging, the systems need to reach at quasistatic equilibrium so that high quality images can be acquired during the scanning with minimal interfaces moving.…”

Section: Combining Flow Experiments With Imagingmentioning

confidence: 99%

X-ray microcomputed imaging of wettability characterization for multiphase flow in porous media: A review

Zou

Sun

2020

Capillarity

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With the advent of X-ray micro-computed tomography which is now routinely used, porescale fluid transport and processes can be observed in three-dimensional (3D) at the microscale. Multiphase flow experiments that are conducted under in situ imaging scanning conditions can be utilized to study the pore-scale physics relevant to subsurface technological applications. X-ray micro-tomographic imaging is a non-destructive technique for quantifying these processes in 3D within confined pores. This paper presents a review for the usage of X-ray micro-computed tomography experiments to investigate wettability effect on multiphase flow. The fundamental workflow of combining experiments with pore-scale in situ imaging scanning such as equipment requirements, apparatus design and fluid systems are firstly described. Then imaging analysis toolkit is presented for how to quantify interfacial areas, curvatures, contact angles, and fluid properties through these images. Furthermore, we show typical examples, illustrating recent studies for the wettability characterization by using X-ray micro-computed imaging.

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Pore-scale investigation of microscopic remaining oil variation characteristics in water-wet sandstone using CT scanning

Cited by 93 publications

References 27 publications

Pore-Scale Imaging of the Oil Cluster Dynamic during Drainage and Imbibition Using In Situ X-Ray Microtomography

Pore-Scale Imaging of the Oil Cluster Dynamic during Drainage and Imbibition Using In Situ X-Ray Microtomography

Displacement mechanism of polymeric surfactant in chemical cold flooding for heavy oil based on microscopic visualization experiments

X-ray microcomputed imaging of wettability characterization for multiphase flow in porous media: A review

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