Quantitative criteria for identifying main flow channels in complex porous media

Li, Xizhe; Lu, Detang; Luo, Ruilan; Sun, Yize; Shen, Weijun; Hu, Yong; Liu, Xiaohua; Qi, Yue; Guan, Chunxiao; Guo, Hui

doi:10.1016/s1876-3804(19)60256-9

Cited by 37 publications

(15 citation statements)

References 22 publications

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“…As the fluid pressure increased (i.e., greater than 11 MPa, and 11 MPa is the opening point of the microcracks in the experiment), the effective stress gradually decreased, and the microcracks gradually opened. The main seepage channels in the rock samples were opened, and the permeability increased rapidly [38,39]. At this time, the permeability of the rock sample was mainly the result calculated using the second part of Equation (11), and the first part of the equation had little effect on the results.…”

Section: Analysis Of the Relationship Between Stress Andmentioning

confidence: 91%

Influence of Microcracks on Stress Sensitivity in Tight Sandstone

Zhang

et al. 2021

Lithosphere

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Stress sensitivity occurs throughout the reservoir development process, especially in the study of low permeability tight reservoir, considering the influence of stress sensitivity is particularly important. When studying stress sensitivity, the current main experimental methods are variable confining pressure and variable fluid pressure methods, but they cannot simulate the stress sensitivity during water injection development. Therefore, in this paper, an experimental stress sensitivity method that can be used to study the depletion mining and water injection development processes is established. In addition, the influence of different degrees of microcrack development on the stress sensitivity of the reservoir is investigated. The results of this study show that under the experimental conditions described in this article, the loading of axial compression plays a role of preloading stress and realizes the whole process of stress sensitivity under the condition that the fluid pressure is lower than the confining pressure. In the experiment, the permeability growth rate of matrix cores does not exceed 20%. For cores containing microcracks, when the axial pressure was less than 30 MPa, the permeability slowly increased with increasing fluid pressure. When the axial pressure was 30 MPa, the permeability changes are mainly divided into two stages. In the first stage, the microcracks are closed under compressive stress. At this time, the microcracks have a limited impact on the seepage capacity. The permeability increases slowly with increasing fluid pressure. In the second stage, the permeability rapidly increases after the microcracks open. These two stages can be described by two straight lines. The slope of the first line has nothing to do with the development of microcracks; the higher the degree of microcrack development, the greater the slope of the straight line of the second stage. For all of the cores, the permeability decreases as the axial pressure increases.

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Section: Analysis Of the Relationship Between Stress Andmentioning

confidence: 91%

Influence of Microcracks on Stress Sensitivity in Tight Sandstone

Zhang

et al. 2021

Lithosphere

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“…The stimulated reservoir volume (SRV) zone is formed after multistage fracturing of horizontal wells in tight oil reservoirs. In this area, the reservoir rocks are broken, forming hydraulic fractures and fracture areas [18,19]. In Figure 1, each fracture zone is simplified as a main fracture and a fracturing zone around the main fracture, in which the fracturing zone is simplified as a rectangular zone.…”

Section: Mathematical Model Descriptionmentioning

confidence: 99%

Temperature Prediction Model for Two-Phase Flow Multistage Fractured Horizontal Well in Tight Oil Reservoir

2021

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Distributed temperature sensing (DTS) has been used for fracture parameter diagnosis and flow profile monitoring. In this paper, we present a new model for predicting the temperature profile of two-phase flow multistage fractured horizontal wells in the tight oil reservoirs. The homogeneous reservoir flow/heat transfer model is extended to the tight oil reservoir-fracture-wellbore coupled flow/thermal model. The influence of SRV area on reservoir and wellbore is considered, and the Joule-Thomson effect, heat convection, heat conduction, and other parameters are introduced into the improved model. The temperature distributions of reservoir and wellbore with different production times, water cut, and locations of water entry are simulated. The simulated results indicate that the Joule-Thomson effect will cause wellbore temperature to rise; the temperature of fractures with more water production is significantly lower than that of other fractures, and the water outlet location can be judged according to the temperature change of the wellbore. By using the improved temperature prediction model, the DTS monitoring data of two-phase flow multistage fractured horizontal well in the tight reservoir has been calculated and analyzed, and the accurate production profile has been obtained.

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“…The pore skeleton details in the right column demonstrate the joint channels along the connecting nodes. The porosity increase is beneficial for the formation of node connections and more water flow channels [38]. The connectivity between pores can be obtained from the pore skeleton model.…”

Section: Pore Distribution Along the Bed Heightmentioning

confidence: 99%

Pore Connectivity and Dewatering Mechanism of Tailings Bed in Raking Deep-Cone Thickener Process

et al. 2020

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Paste and thickened tailings (PTT) technology can improve the utilization and management of tailings from processing plants. The pore size distribution (PSD) and microstructure evolution affected by the rake shear in thickening tailings beds are essential to produce a high-density tailings underflow. Continuous thickening and computed tomography (CT) scanning tests were conducted to study the PSD with and without shear. The pore morphology was studied to reveal the shearing-dewatering performance of the tailings bed. The results show that at a flocculant solution concentration of 0.01 wt % and a feed slurry concentration of 10 wt%, the underflow concentration with and without shear can reach 58.5 wt %and 55.8 wt %, respectively. The CT image reconstruction models demonstrated that the porosity of the sheared tailings bed increased with the bed height. When the bed height increased from 2.5 to 10 cm, the porosity increased from 35.1% to 41.9%, the pore fractal dimension increased from the range 1.8–1.95 to the range 2.1–2.15, and the pore quantity decreased by 21.39%. The average pore volume increased with increasing height by 13.93%, 16.57% and 12.07%. The pore structure became more complex with the bed height, and the connectivity between pores increased to form water-flow channels, which were beneficial to the drainage of sealed water.

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Quantitative criteria for identifying main flow channels in complex porous media

Cited by 37 publications

References 22 publications

Influence of Microcracks on Stress Sensitivity in Tight Sandstone

Influence of Microcracks on Stress Sensitivity in Tight Sandstone

Temperature Prediction Model for Two-Phase Flow Multistage Fractured Horizontal Well in Tight Oil Reservoir

Pore Connectivity and Dewatering Mechanism of Tailings Bed in Raking Deep-Cone Thickener Process

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