Directional hydraulic fracturing technology for prefabricated longitudinal guide seams in a coal mine tight sandstone roof

Liangwei, Li; Wu, Wei

doi:10.1177/01445987211028997

Cited by 3 publications

(2 citation statements)

References 34 publications

(28 reference statements)

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“…Based on the theory of fluid mechanics, the law of conservation of mass and energy must be obeyed during the movement of fluid [18][19][20].…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Chu

2024

IJNRES

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Hydraulic fracturing technology has been widely used in the development of low-permeability oil fields, gas fields, and coalbed methane. The morphology of the sand dike formed by proppant deposition in the fracture determines the effective shape of the fracture, the effective volume, the flow conductivity, and the validity period of the fracture, and the research on the proppant transport law in the fracture is of great significance in optimizing the fracturing construction parameters and improving the fracturing production increase effect. In this paper, a systematic study on the proppant transport law in hydraulic fracturing fracture is carried out by numerical simulation, which reveals the mechanism of proppant settling and transport, clarifies the proppant transport and placement law under different working conditions, and puts forward the optimization strategy of hydraulic fracturing process on the basis of this study.

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“…Based on the theory of fluid mechanics, the law of conservation of mass and energy must be obeyed during the movement of fluid [18][19][20].…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Chu

2024

IJNRES

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“…At present, researchers have studied fracture propagation using various methods. − Among them, experimental research can directly observe and analyze the morphology of fracture propagation and its influencing factors, which has become the most commonly used method to study hydraulic fracture propagation in low-permeability reservoirs. However, most experimental specimens are limited to a small scale as a result of the limited experimental conditions. − Currently, hydraulic fracturing experiments use cubic specimens with a side length of 100–300 mm to explore the propagation morphology and law of fractures. − Some studies have attempted to extend the fracture propagation length by enlarging specimens to determine the laws of deflection and bifurcation of fractures during fracturing. , Recently, with the continuous innovation of large-scale fracturing experimental equipment, the side length of the specimen reaches 2060 mm, greatly improving the reliability of the research results . Experimental research has helped us to understand the mechanism of fracture propagation during hydraulic fracturing in low-permeability reservoirs to some extent.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Hydraulic Fracture Propagation and Multi-well Effect during Multiple Vertical Well Fracturing in Layered Reservoirs with Low Permeability

Yang,

Li,

et al. 2023

Energy Fuels

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Segmental-layered modeling and fine grid division methods were proposed to construct a three-dimensional largescale layered geologic model and reveal the mechanisms of hydraulic fracture propagation and the well spacing effect in multi-well fracturing in layered reservoirs with low permeability. The hydraulic fracture propagation in layered reservoirs under multi-well fracturing was simulated using a continuum-based discrete element numerical method. The effects of the stratum property difference, in situ horizontal stress difference (HSD), and well spacing on breakdown pressures and fracture propagation were analyzed. The concept of "extension ellipse" was proposed to describe the propagation morphology of fractures, which addresses the difficulty of accurately characterizing the propagation morphology of fractures at the geologic scale. The influence range of the multiwell effect in layered reservoirs was also determined, and the effect mechanisms of stress amplification and attraction and repulsion between fractures on the behavior of hydraulic fracture propagation were revealed. Layered reservoirs and higher in situ HSD restrict the development of hydraulic fractures but greatly reduce the breakdown pressures. The multi-well fracturing mode changes the stress field distribution around the wells and weakens the effects of in situ HSD on fracture propagation. In comparison to homogeneous reservoirs, the range of the multi-well effect in the layered reservoirs is relatively small. At the fracturing site, the well spacing should be appropriately increased in the direction of the maximum horizontal stress and should be reduced in the direction of minimum horizontal stress, helping hydraulic fracture development and improving the fracturing stimulation effect in layered reservoirs. This study addresses the deficiency of considering stratum property differences in the existing large-scale fracturing models, and the results provide a reference for the optimization and design of fracturing simulation in the layered reservoirs with low permeability.

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Research and field practice of integrated pressure relief technology of low-pressure abrasive jet slotting and fracturing in deep roadway

Wang,

Guo,

Chen

et al. 2024

Preprint

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In order to control the large deformation of deep roadway, this paper analyzes the initiation conditions of abrasive jet slotting and fracturing, uses Fluent and UDEC to simulate and analyze the effect of low-pressure abrasive jet and the effect of slotting-fracturing integrated roof cutting and pressure relief, and conducts experiments in the field. The results show that the purpose of abrasive jet is to form prefabricated cracks and crack damage zones on the hole wall, providing an advantageous channel for hydraulic fracturing. In a certain range, with the increase of incident pressure, abrasive particle diameter and nozzle diameter, the effect of abrasive jet is improved, and the influence of incident pressure is the most significant. After the application of low-pressure abrasive jet slotting-fracturing integration technology in the field, the displacement of the roadway on the side of the goaf is significantly reduced, and the pressure relief effect of the roadway is good. The numerical simulation results also show that after the slotting fracturing pressure relief, the peak value and concentration coefficient of the bearing stress inside the retained coal pillar are reduced, and the damage zone around the roadway is relatively reduced.

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Directional hydraulic fracturing technology for prefabricated longitudinal guide seams in a coal mine tight sandstone roof

Cited by 3 publications

References 34 publications

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Mechanisms of Hydraulic Fracture Propagation and Multi-well Effect during Multiple Vertical Well Fracturing in Layered Reservoirs with Low Permeability

Research and field practice of integrated pressure relief technology of low-pressure abrasive jet slotting and fracturing in deep roadway

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