Cyclic injection to reduce hydraulic fracture surface roughness in glutenite reservoirs

Nie, Yuanxun; Zhang, Guangqing; Wen, Jing; Li, Shiyuan; Zhou, Dawei

doi:10.1016/j.ijrmms.2021.104740

Cited by 20 publications

(10 citation statements)

References 34 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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“…(1) Using pulse hydraulic fracturing technology, [17][18][19] a dense network of cracks is formed in the hard roof directly above the coal pillar, fully crushing this area. By using directional hydraulic fracturing technology, 20,21 the hanging roof of the goaf on both sides of the coal pillar is cut off, effectively optimizing the stress above the coal pillar and reducing the source of stress.…”

Section: The Idea Of Using Hydraulic Fracturing To Control Stress Con...mentioning

confidence: 99%

Section: The Idea Of Using Hydraulic Fracturing To Control Stress Con...mentioning

confidence: 99%

“…(2) By using pulse hydraulic fracturing technology, [17][18][19] a dense network of cracks is formed within the coal pillar, fully crushing this area, reducing the stiffness of the coal pillar, and thereby reducing the bearing capacity of the coal pillar. (3) By using pulse hydraulic fracturing technology, [17][18][19] a dense network of cracks is formed in the hard floor directly below the coal pillar, fully crushing this area, thereby weakening the ability to transmit stress concentration. (4) At the same time, the fractured area formed in the coal pillar and its roof and floor using pulse hydraulic fracturing technology can absorb the dynamic pressure generated by the collapse of the roof on both sides of the coal pillar, preventing the transmission of dynamic pressure to the lower part of the coal pillar.…”

Section: The Idea Of Using Hydraulic Fracturing To Control Stress Con...mentioning

confidence: 99%

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Hydraulic fracturing method for relieving stress concentration in remaining coal pillar in overlying goaf

Shao,

Huang,

Zhao

et al. 2024

Energy Science & Engineering

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The stress concentration caused by the presence of the remaining coal pillar in the overlying goaf can easily cause large deformation of the roadway in the lower seam and other problems. To solve this problem, the reasons for stress concentration caused by the remaining coal pillar in the overlying goaf were analyzed. A hydraulic fracturing method for relieving stress concentration has been proposed. By using hydraulic fracturing technology to remove the hanging roof on both sides of the coal pillar and weaken the coal pillar system, high stress is transferred to the goaf. The degree of stress concentration in coal pillars and surrounding rock of roadway can be reduced by 47% and 26%, respectively. This method can also solve the stress concentration problem of the remaining ore pillar in the overlying goaf of the metal ore. This method has been applied in the coal mine. The deformation of the surrounding rock of the test roadway after hydraulic fracturing has been reduced by more than 60%.

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“…Wang [49] introduced Pelect number to solve the dominant path problem of seepage channel. During the seepage, the stress and other factors will influence the permeability parameters [50,51]. For water and sand flow in the fracture, we can think it as the seepage system.…”

Section: Direct Analysismentioning

confidence: 99%

Research on the Permeability of Water and Sand in the Fractured Rock

Liu¹,

Li²,

Li³

et al. 2022

Pol. J. Environ. Stud.

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The water and sand inrush is very factor to influence the safety production of mining. In order to understand the mechanism of water and sand flow in the fracture, the seepage system was designed and manufactured to test the permeability of water and sand in the fractured rock. According to the seepage test, the magnitude of the effective fluidity was in 10 -8 ~10 -5 m n+2 . S 2-n /kg, while non-Darcy factor β ranged from 10 5 to 10 8 m -1 . The relationship of the effective fluidity and non-Darcy factor β-(Joint Roughness Coefficient) JRC was fitted using the exponential function. The equations of effective fluidity and non-Darcy factor were obtained by using the genetic algorithm and the fitting parameters were obtained. The main and secondary factors that affect the permeability include the fracture aperture, roughness, concentration and particle size. Through simulation, it was found that the roughness exhibited no significant effect on the pressure field; however, it did have a significant effect on the velocity field. Velocity of water and sand keeps 1.62 m/s, which increases prominently with the JRC increase. The safety regions are deduced under different coefficient n. The study is important to explore the mechanism of water and sand inrush.

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Cyclic injection to reduce hydraulic fracture surface roughness in glutenite reservoirs

Cited by 20 publications

References 34 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

Hydraulic fracturing method for relieving stress concentration in remaining coal pillar in overlying goaf

Research on the Permeability of Water and Sand in the Fractured Rock

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