Frozen core experimental study on oil-water distribution characteristics at different stages of water flooding in low permeability oil reservoirs

Wei, Jiang; Liang, Shuang; Zhang, Dong; Li, Jiangtao; Zhou, Runnan

doi:10.1016/j.energy.2023.128007

Cited by 9 publications

(3 citation statements)

References 57 publications

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“…Low permeability reservoirs are usually characterized by small porosity, low permeability (1-10 mD), complex pore structure and high clay content (Wei et al, 2023). The development of these reservoirs faces challenges such as insufficient natural energy, slow propagation of pressure, and a rapid decline in production rates (Kang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

The injection capacity evaluation of high-pressure water injection in low permeability reservoir: numerical and case study

Zhu,

Gao,

Wang

et al. 2024

Front. Earth Sci.

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Low permeability oil reservoir resources are rich and their efficient development is considered an important way to solve energy security issues. However, the development process of low permeability oil reservoirs is faced with the challenges of insufficient natural energy and rapid production decline. The high-pressure water injection technology is a method that relies on high-pressure and large-volume to inject fluid into the reservoir to replenish energy. It is considered as an important technical means to quickly replenish formation energy. This study focuses on the injection capacity for the high-pressure water injection technology of low permeability oil reservoir. Firstly, the fluid-structure interaction mathematical model for two-phase fluid flow was established. The solution of the mathematical model was then obtained by coupling the phase transport in porous media module and Darcy’s law module on the COMSOL numerical simulation platform. The numerical model established in this study was verified through the Buckley-Leverett model. The study on the injection capacity of high-pressure water injection technology was conducted using the geological background and reservoir physical properties of Binnan Oilfield (Shengli, China). The results show that the production pressure difference is the key factor in determining the injection capacity. When the production pressure difference increases from 5 MPa to 30 MPa, the cumulative injection volume increases by 8.1 times. In addition, sensitivity analysis shows that the injection capacity is significantly influenced by the properties of the reformation area. The effect of these parameters from high to low is as follows: stress sensitivity factor, permeability, rock compressibility, and porosity. Compared to the reformation area, the influence of the physical parameters of the matrix area on the injection capacity is negligible. Therefore, effective reservoir reformation is essential for enhancing the injection capacity. This research provides a theoretical basis for the design and optimization of the high-pressure water injection technology schemes for low permeability oil reservoir.

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Section: Introductionmentioning

confidence: 99%

The injection capacity evaluation of high-pressure water injection in low permeability reservoir: numerical and case study

Zhu,

Gao,

Wang

et al. 2024

Front. Earth Sci.

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“…Liu et al 28 film thickness in the microscale pores of tight reservoirs is negatively correlated with temperature but positively correlated with pore size. Wei et al 29 studied the characteristics of water drive efficiency in tight reservoirs and analyzed the dynamic evolution characteristics of remaining oil distribution. Feng et al 30 conducted research on movable fluids in tight sandstone reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Oil Recovery of Tight Oil Reservoirs in Different Oil Occurrence States

Zhou,

Wei,

Liu

et al. 2023

Energy Fuels

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The occurrence state of crude oil in tight reservoirs is complex and is significantly influenced by different development methods. In this paper, first, a core-scale static imbibition/dynamic huff and puff and frozen slice residual oil joint testing experimental technology is developed. Second, fluorescence images of tight reservoir cores in different states are tested using the laser confocal method under different conditions. Third, the amounts of crude oil in different occurrence states are quantitatively identified. The results show the following: (a) Under static imbibition conditions, pressurization will increase the recovery of free-state crude oil, reduce the recovery of semibound-state crude oil, and increase the recovery of bound-state crude oil. (b) Under static imbibition conditions, both imbibition systems will use a large amount of free-state crude oil, a small amount of semibound-state crude oil, and a very small amount of bound-state crude oil. The ability of PAM-type slick water system to utilize free crude oil is stronger than that of anionic nonionic surfactants. The ability to use semibound-state and bound-state crude oil is weaker than that of the anionic nonionic surfactant system. (c) Increasing soaking time under dynamic huff and puff conditions will increase the recovery of free-state crude oil and reduce the recovery of semibound-state and bound-state crude oil. (d) The ability of static imbibition to utilize free-state crude oil is stronger than that of dynamic huff and puff. The ability of static imbibition to produce semibound-state crude oil is weaker than that of dynamic huff and puff. The capacity of producing bound-state crude oil is the same as that of dynamic huff and puff.

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“…Water flooding, with its economic advantages, remains the primary development method for low-permeability reservoirs. During the process of reservoir exploitation, as pore pressure decreases, the effective pressure on the reservoir increases, causing rocks to undergo elastic-plastic deformation, leading to partial or complete irreversible changes in permeability and porosity [7][8][9][10][11][12]. For continuous water flooding, the injected water generally flows along the high permeability channel, and the displacement efficiency is low.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of Development Strategies for High-Pressure, Low-Permeability Reservoirs

Nan,

Xin,

et al. 2023

Processes

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Currently, there is no well-established framework for studying development patterns in high-pressure, low-permeability reservoirs. The key factors influencing development effect typically include the reservoir properties, well pattern, well spacing, and the rate of oil production. Reservoir A is a representative of this type of reservoir. Starting from its physical properties, a study of the development mechanism was conducted using the tNavigator (22.1) software. A total of 168 sets of numerical experiments were conducted, and 3D maps were innovatively created to optimize the development mode. Building upon the preferred mode, an exploration was carried out for the applicability of gas flooding and the optimization of water flooding schemes for such reservoirs. All experimental results were reasonably validated through Reservoir A. Furthermore, due to the high original pressure in such reservoirs, the injection of displacement media was challenging. Considering economic benefits simultaneously, a study was conducted to explore the rational utilization of natural energy. The research proved that for a reservoir with a permeability of about 10 mD, the suitable development scheme was five-point well pattern, a well spacing of 350 m, water–gas alternating flooding, and an initial oil production rate of 2%. When the reservoir underwent 8 months of depleted development, corresponding to a reduction in the reservoir pressure coefficient to 1.09, the development efficiency was relatively favorable. Over a 15-year production period, the oil recovery reached 29.98%, the water cut was 10.31%, and the reservoir pressure was maintained at around 67.18%. The geology of the newly discovered reservoir is not specific in the early stage of oilfield construction, and this research can help to determine a suitable development scheme.

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Frozen core experimental study on oil-water distribution characteristics at different stages of water flooding in low permeability oil reservoirs

Cited by 9 publications

References 57 publications

The injection capacity evaluation of high-pressure water injection in low permeability reservoir: numerical and case study

The injection capacity evaluation of high-pressure water injection in low permeability reservoir: numerical and case study

Experimental Study on Oil Recovery of Tight Oil Reservoirs in Different Oil Occurrence States

Comprehensive Study of Development Strategies for High-Pressure, Low-Permeability Reservoirs

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