A novel fluid–solid coupling model for the oil–water flow in the natural fractured reservoirs

Zhang, Dongxu; Zhang, Liehui; Tang, Huiying; Yuan, Shuwu; Wang, Hui; Chen, Shengnan Nancy; Zhao, Yi

doi:10.1063/5.0041267

Cited by 25 publications

(3 citation statements)

References 51 publications

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“…The gas in the coal matrix is driven by the concentration gradient to exchange material with the fissure gas by diffusion. According to Fick's law, the conservation of gas mass in the matrix can be derived as [35] :…”

Section: Governing Equation Of Fluid Seepage Fieldmentioning

confidence: 99%

Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing

Fan,

Sun,

Yang

et al. 2024

Preprint

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The controlled shock wave (CSW) fracturing is an effective method for enhancing permeability of coal seam to promote gas extraction. Based on Fick's law, Darcy's law, the ideal gas law and the Langmuir equation, a damage-seepage-deformation coupling mathematical model of CSW fracturing in coal seam combined with the maximum tensile stress and the Mohr-Coulomb criterion is established. This model is implemented into COMSOL Multiphysics to simulate the coal seam CSW fracturing and subsequent gas extraction. When the shock wave and isotropic in-situ stress are applied on the borehole wall, the coal damage zone is an annular shape, and the permeability in the damage zone increases sharply. The CSW can effectively increase the efficiency of gas extraction and reduce the gas pressure and gas content in coal seam. With the increase of CSW action times, the damage in coal mass reaches a threshold and tends to be stable after several shocks. The damage area and the gas extraction efficiency are positively correlated with the shock intensity. Under the anisotropic ground stress, the larger diversity of the stress in different directions is, the more obvious damage extension in the fractured coal along the maximum stress direction is. Ground stress can inhibit the extension of cracks in the CSW fractured coal seam. This inhibition effect becomes more obvious with the increase of in-situ stress.

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Section: Governing Equation Of Fluid Seepage Fieldmentioning

confidence: 99%

Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing

Fan,

Sun,

Yang

et al. 2024

Preprint

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“…As the difficulty of water control in reservoir properties and bottom water multiplicity gradually increases, in order to ensure the water control effect of the process, research on the combination of ICD, variable density sieve tube, and continuous packer has been carried out [7]. However, the risk of bottom water coning in fractured reservoirs is higher, and it is difficult to accurately predict the process of bottom water coning in fractured reservoirs and its impact on oil and gas production, especially the water-locking effect after the reservoir sees water, which can cause a rapid decline in production in a short period of time [8,9]. Currently, the most widely used water control process is to seal the fractures with chemical reagents such as gel, which aims to reduce the seepage rate of bottom water in the fracture zone and prevent bottom water from coning in during the early production period [6,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Performance of a Composite Water Control Process for Offshore Bottom Water Fractured Gas Reservoirs

Wang,

Li,

Zhang

et al. 2023

Energies

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Natural gas, as one of the main energy sources of the modern clean energy system, is also an important raw material for the chemical industry, and the stable extraction of natural gas reservoirs is often affected by bottom water. It is difficult to control water in natural gas reservoirs, while fractured gas reservoirs are even more demanding. This is due to the complexity of the seepage laws of gas and water in fractures, resulting in the poor applicability of conventional processes for water control. Continuous research is needed to propose a process with effective control capabilities for bottom-water fractured gas reservoirs. Aiming at the above difficulties, this paper is based on a large-scale three-dimensional physical simulation device to carry out physical model design and simulation results testing and analysis. The water control ability of the combination of density-segmented sieve tubes and continuous packers in fractured gas reservoirs is explored. The physical simulation results show that the fracture distribution characteristics control the upward transportation path of bottom water. According to the segmentation characteristics of the fractures at the horizontal section location, optimizing the number of horizontal well screen tube segments and the density of boreholes reduces the cone-in velocity of bottom water before connecting the fractures to a certain extent. And the combined process has different degrees of water control ability for the three stages of bottom water transportation from the fractured gas reservoir to the production well. As the degree of water in the production well increases, the water control ability of the process gradually decreases. After the implementation of the water control process, the water-free gas production period was extended by about 6.84%, and the total production time was extended by about 6.46%. After the shutdown of the horizontal wells, the reduction in daily water production can still reach 21% compared to the natural extraction. The results of this research can provide process suggestions for water control in offshore fractured reservoirs and further ensure stable production in offshore fractured gas reservoirs.

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“…Oil-water two-phase flow is commonly seen throughout the entire process of crude oil production and transportation [1]. The long history of oil recovery and the application of various secondary and tertiary recovery techniques have brought a higher water cut to the production in many oil fields [2], and such a problem is a general challenge faced by certain middle and late stages of reservoir development [3]. The existence of water in oil production is not preferred in the petroleum industry due to the higher risk of equipment corrosion caused by electro-chemical reactions, which are often believed to be a consequence of water-steel interactions [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Oil–Water Separations Using Membranes in Horizontal Separators

Tao

Sun

2022

Membranes

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The effect of temperature on oil–water separations is studied in this paper, focusing on the changed penetration velocities of water droplets on the separation membrane in a horizontal separator. A compact numerical scheme is developed based on the phase-field model, and the temperature effect is first theoretically analyzed regarding the key thermodynamic properties that may affect the separation performance. The computational scenario is designed based on practical horizontal separators in the oil field, and the droplet motions in the oil–water two-phase flow are simulated using our scheme under various operation conditions. It was found that a higher temperature may result in a faster penetration of the water droplets, and a larger density difference in the oil–water system is also preferred to accelerate the separation using membranes. Furthermore, increasing the operation temperature is proved to benefit the separation of water and heavy oil.

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A novel fluid–solid coupling model for the oil–water flow in the natural fractured reservoirs

Cited by 25 publications

References 51 publications

Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing

Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing

Evaluation of the Performance of a Composite Water Control Process for Offshore Bottom Water Fractured Gas Reservoirs

Effect of Temperature on Oil–Water Separations Using Membranes in Horizontal Separators

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