Quantitative characterization of irregular microfracture network and its effect on the permeability of porous media

Li, Tao; Li, Qian; Hu, Yong; Peng, Xian; Feng, Xi; Zhu, Zhanmei; Zhao, Zihan

doi:10.1016/s1876-3804(21)60034-4

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Reservoirs with microfractures are more easily affected by stress change than those with matrix and propped fractures. The roughness, dislocation, and geometry, as well as rock mechanical properties of fractures, − have a huge impact on microfracture conductivity. However, the stress sensitivity of hydraulic fractures has little effect on the final productivity.…”

Section: Results and Discussionmentioning

confidence: 99%

Pressure Drawdown Management Strategies for Multifractured Horizontal Wells in Shale Gas Reservoirs: A Review

Liu

et al. 2022

ACS Omega

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The flow capacity of shale gas reservoirs is easily impaired during the depletion process due to strong stress sensitivity. Thereby, an adequate production system, namely, the managed pressure drop method, has been widely introduced to the industrial practice application by decelerating the wellbore pressure drop rate and ultimately improving the long-term production process. This work presents a review of the pressure drawdown management mechanisms for shale gas formations. However, clarifying the water–shale interaction physical chemistry process and developing a mathematical model that accurately describes the water–shale interaction mechanism remain a challenge. Moreover, different classifications of the managed production simulation research approaches are discussed in detail. Each approach has its own merits and demerits. Among them, numerical simulations are commonly seen in cognizance of characterizing the managed pressure drawdown production period but are found to be relatively time-consuming and also computationally expensive. An optimized theoretical model is therefore essential because it can lead to a precise estimation of the ultimate long-term production and capture instantaneously the actual shale gas reservoir depletion phenomenon with various production systems compared to other available methods. The key influence of managed pressured production for single wells in shale reservoirs is elaborated as well. As observed from the current review, an accurate description of the pressure drop management mechanism is crucial for the theoretical model of the pressure control production process for shale gas wells. The influence of water–rock interaction on the managed pressure drawdown mechanism cannot be ignored. There have thus been works to improve and enhance it for use in theoretical models for shale formations. On the other hand, the advancement of theoretical models presents an opportunity for better representation of the managed pressure drop production process.

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Section: Results and Discussionmentioning

confidence: 99%

Pressure Drawdown Management Strategies for Multifractured Horizontal Wells in Shale Gas Reservoirs: A Review

Liu

et al. 2022

ACS Omega

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“…It is one of the most important types of unconventional oil and gas resources. − The pore throats and microcracks in tight reservoirs are important channels for oil and gas seepage. Their distribution and morphology are more complicated. − The identification of effective seepage channels in tight reservoirs is based on the fine characterization of the microscopic pore throat structure and microcrack features. With the exploration and development of unconventional oil and gas, the conventional micropore and throat structure characterization techniques can no longer accurately reflect the size, morphology, distribution, spatial connectivity, and other characteristics of the internal pore and throat in tight reservoirs. − The characteristics of low porosity and low permeability of tight reservoirs are characterized by long cycle time and insufficient resolution in traditional analysis tests, which makes it difficult to realize the fine delineation of effective seepage channels in tight reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Yuan,

Tang,

Xiao

et al. 2024

Energy Fuels

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With the Fuyu oil layer in the Songliao Basin taken as the research object, this study explores the characteristics and genetic mechanism of effective seepage channels in the tight reservoir based on the identification of the characteristics of the pore–crack system and the identification of the effective seepage channels using the methods of core observation, casting thin-section observation, scanning electron microscope observation, wood alloy injection, and three-dimensional reconstruction of cores, and synthesizing the parameters of the depositional microfacies, reservoir properties, and pore–crack combination. The results showed that the seepage channels in tight reservoirs can be categorized into effective seepage channels for type I, effective seepage channels for type II, effective seepage channels for type III, and ineffective seepage channels, and their seepage capacity and their degree of development were weakened in order. The formation of effective seepage channels was influenced by the depositional environment and petrogenesis. Different types of seepage channels were formed by different diagenesis after different minerals were formed in the depositional stage.

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“…Li et al (2020) calculated the apparent permeability for microfracture networks and concluded that slippage and desorption were beneficial because they led to a later apparent permeability increase. Li et al (2021) analyzed the impacts of microfracture networks on rock permeability, and their study showed that the permeability was increased, and there was a smaller tortuosity.…”

Section: Introductionmentioning

confidence: 99%

Study of nonlinear flow mechanisms and microfracture networks in low-permeability reservoirs

et al. 2023

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As efficient technologies boost oil yields and economic benefits, horizontal wells and hydraulic fracturing are widely used in low- permeability reservoirs. To better evaluate the reserve and improve recovery, it is essential to determine fluid flow patterns and transport mechanisms. Laboratory experiments, field operations, and analytical studies have identified nonlinear flow and microfracture networks during the fluid flow in a reservoir with fractured horizontal wells. However, the interactions between nonlinear flow and microfracture networks are still not fully understood. In this study, nonlinear flow experiments and triaxial compression tests were carried out to analyze nonlinear flow characteristics in the vicinity of microfracture networks. By analyzing the effects of microfracture networks on nonlinear flow, two-phase flow, rock stress sensitivity, and artificial fractures, we found that fluid capacity in capillaries with smaller dimensions decreased along with a drop in the pressure gradient, generating a nonlinear flow pattern. The area of nonlinear flow was diminished by the presence of microfractures, which improved flow efficiency and reservoir quality. Considering the size of fracture apertures, microfractures behave more like matrix pores than natural fractures. Also, microfractures significantly increase rock stress sensitivity and reduce the threshold permeability, which enhances fluid flow capacity. This study contributes to our understanding of flow behavior, predicting production and improving recovery in low-permeability reservoirs.

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Quantitative characterization of irregular microfracture network and its effect on the permeability of porous media

Cited by 7 publications

References 23 publications

Pressure Drawdown Management Strategies for Multifractured Horizontal Wells in Shale Gas Reservoirs: A Review

Pressure Drawdown Management Strategies for Multifractured Horizontal Wells in Shale Gas Reservoirs: A Review

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Study of nonlinear flow mechanisms and microfracture networks in low-permeability reservoirs

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