A mathematical model and numerical simulation of waterflood induced dynamic fractures of low permeability reservoirs

Tianyi, Fan; Song, Xiaomin; Wu, Shuhong; Li, Qiaoyun; Wang, Baohua; Li, Xiaobo; Li, Hua; Liu, Hailong

doi:10.1016/s1876-3804(15)30047-1

Cited by 22 publications

(7 citation statements)

References 5 publications

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“…吴侃 [37] 基于对流体在裂缝中渗流规律的分析, 建立了裂缝扩展模型, 模拟裂缝扩展对注水开发采出程度的影响. 范天一等 [38] 将裂缝的扩展简化为裂缝长度的演化, 利用动态渗透率方法表征裂缝属性的变化过程, 实现对注水动态裂缝的演化以及参数变化的模拟. 雷征东等 [39,40] [38] .…”

Section: 注水诱导动态裂缝的矿场表现特征unclassified

Development theory and practice of water injection induced fractures in ultra-low permeability reservoirs

Wang¹,

Cheng²,

Qin³

et al. 2021

Sci. Sin.-Tech.

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Section: 注水诱导动态裂缝的矿场表现特征unclassified

Development theory and practice of water injection induced fractures in ultra-low permeability reservoirs

Wang¹,

Cheng²,

Qin³

et al. 2021

Sci. Sin.-Tech.

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“…Owing to the low primary recovery rate of tight oil (5%-10%), advanced oil recovery methods are usually implemented to improve its recovery rate (Wang, 2007;Wang et al, 2017a;Tian et al, 2019;Zhang et al, 2020). Water injection has been proved efficient in tight oil reservoirs because it can supplement the formation energy and overcome the threshold pressure gradient (Fan et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Impacts of geomechanical damage on waterflood-induced fracture propagation in deeply deposited tight oil reservoirs

Ding,

Ge,

Chen

et al. 2024

Front. Energy Res.

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Waterflood-induced fractures can enhance the production of deep tight oil reservoirs. However, if waterflood-induced fractures propagate fast, they connect injection wells to production wells earlier, inhibiting the production of tight oil reservoirs. In the present research, the fast propagation mechanism of waterflood-induced fractures was mainly investigated. The changes in sandstone mechanical properties by water were investigated by laboratory experiments, and the relationship of the geomechanical damage of sandstones with water saturation was quantified. Flow-geomechanics-coupled numerical simulations were performed to analyze the impacts of water flooding on stress distribution in a deeply deposited tight oil reservoir. Based on the fracture mechanics theory, the propagation length of the waterflood-induced fracture was calculated and the characteristics of waterflood-induced fracture propagation were analyzed. Experimental results revealed that water changed the mineral composition and microscopic structure of sandstones. This phenomenon decreased the Young’s modulus and tensile strength of sandstones and increased the Poisson’s ratio. The changing magnitude of these properties increased with the rise of water saturation, and the maximum changing magnitude reached 70%. The water saturation distribution became heterogeneous after waterflooding, causing a heterogeneous distribution of mechanical properties. The stress around the fracture tip and the fracture propagation length were significantly affected by these property changes. After the geomechanical damage, the fracture propagation pressure decreased by about 20%. Moreover, the initial fracture length enhanced the propagation length of the waterflood-induced fracture. These results suggest that the propagation of waterflood-induced fractures becomes more significant during waterflooding; thus, the injection pressure should be reduced to avoid fast fracture propagation.

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“…China has large oil/gas reserves in low-permeability reservoirs, whereas the poor geological characteristics of the reservoir restrain the oil and gas production with an overall recovery factor under 20% (EIA, 2018;Wang et al, 2019;Peng et al, 2021). Waterflooding is proved to be an effective approach to improve the production rate and achieve sustainability in the extra-low permeability reservoirs, through promoting the water-injection induced fractures (WIF) and increasing the swept area (Hagoort, 1981;Suarez-Rivera et al, 2002;Fan et al, 2015;Baker et al, 2016). The WIF was first proposed and simulated by (Hagoort, 1981), and it could propagate dynamically with the water-flooding according to data from experiments, logging and production .…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the impact of water-rock interactions on the propagation of water-flooding induced fracture

Peng²,

Pan³

et al. 2023

Front. Earth Sci.

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Introcution: Water-flooding is an effective way to develop the extra-low permeability oil reservoirs and the water-flooding induced fracture (WIF) can improve waterflooding efficiency. However, geomechanical properties of rocks may alter due to the water-rock interactions, which usually increases the heterogeneity of reservoir properties and affects the WIF propagation.Methods: In this study, a method to calculate the WIF propagation length was proposed and numerical models were established considering the effect of water-rock interactions on geomechanical properties. In addition, the numerical model of stress distribution of the WIF propagation was validated by theoretical solutions based on the fracture mechanics. Moreover, the WIF propagation mechanism and the effect of water-rock interactions on the WIF propagation was analyzed.Results: Results indicate that the numerical model is valid to calculate the stress distribution induced by the WIF with an error under 5%. In addition, the WIF propagation can be affected by several factors, including the injection pressure, the damage variable and the initial fracture length. Noteworthy, the injection pressure should be strictly controlled because the WIF propagation is highly sensitive to the injection pressure. An increase of 2 MPa in the injection pressure can result in 90 m WIF propagation length, accounting for 64% of initial fracture length in the case studied in this work.Discussion: Moreover, water-rock interactions aggravate the heterogeneity of the reservoir and promote the WIF propagation due to the alteration of the geomechanical properties such as Young’s modulus. Therefore, the WIF can propagate even if the injection pressure is less than the minimum horizontal stress. Furthermore, the stress intensity factor (KIA) and WIF propagation length increase with the initial fracture length, which may lead to sudden water flux and reduce the efficiency of waterflooding.

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A mathematical model and numerical simulation of waterflood induced dynamic fractures of low permeability reservoirs

Cited by 22 publications

References 5 publications

Development theory and practice of water injection induced fractures in ultra-low permeability reservoirs

Development theory and practice of water injection induced fractures in ultra-low permeability reservoirs

Impacts of geomechanical damage on waterflood-induced fracture propagation in deeply deposited tight oil reservoirs

Numerical study on the impact of water-rock interactions on the propagation of water-flooding induced fracture

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