Simulation and optimization of fracture pattern in temporary plugging fracturing of horizontal shale gas wells

Chang, Xin; Wang, Xingyi; Yang, Chunhe; Guo, Yintong; Wei, Kai; Hu, Guang; Jiang, Chengbai; Li, Qiang; Dou, Ruijie

doi:10.1016/j.fuel.2023.130378

Cited by 9 publications

(3 citation statements)

References 46 publications

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“…where the permeability of the reservoir is denoted as k, the porosity is represented by ϕ, viscosity of the fracturing fluid is denoted as ϑ, the fluid pressure is P u , and the density of the fracturing fluid is represented by ρ w . The continuity equation of fracturing fluid in the reservoir can be expressed as Equation (17):…”

Section: Study On Seepage Characteristics In Fracturing Processmentioning

confidence: 99%

“…Lv et al [16] conducted a study which found that the proportion of shear damage is relatively low during the multi-cluster fracturing process, and it primarily occurs in the interlayer fractures activated by the outer fractures. Chang et al [17] suggested that reducing the cluster spacing in horizontal fracturing can significantly increase the extension range of hydraulic fractures, but the phenomenon of uneven fracture propagation is severe. In recent years, research on fracturing has mainly focused on the optimization of fracturing design and fracturing technology.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Law of Crack Propagation in Oil Well Fracturing Process

Zhao,

Li,

Luo

2024

Processes

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In the field of oilfield fracturing development, a profound understanding of the evolution and propagation of damage during the fracturing process is crucial for preventing well water coning and channeling. This study aimed to unravel the complexity of damage evolution during fracturing and elucidate the causes of well water flooding phenomena. To accurately describe the damage propagation laws, a damage constitutive model considering compaction and post-peak correction parameters was established in this research. The model, through parameter adjustment, enhances the precision of stress calculation during the rock compaction phase and accounts for the stress degradation pattern subsequent to damage. This model was applied to simulate the damage evolution under various conditions in oil layer profiles and wellbore cross-sections, including the impact of different perforation angles, natural fracture patterns, and the ratio of longitudinal to transverse boundary pressures. The research concludes that well water channeling and flooding are primarily caused by damage propagation and the connectivity with adjacent water-bearing formations. The proposed rock damage constitutive model demonstrated an accuracy improvement of more than 3% compared to previous studies. Additionally, the study discovered that when the angle between the perforation section and the formation exceeds 30°, the risk of fracture propagation into adjacent layers increases, leading to an elevated risk of post-fracturing water flooding. The presence of natural fractures in the oil layer provides a conduit for damage propagation, accelerating the process of damage in the oil layer. Furthermore, the perforation angle and the ratio of boundary pressure loads during the fracturing process were identified as the main factors influencing the direction change of fracture propagation. The conclusions drawn from this study provide a scientific basis for preventing post-fracturing water channeling and flooding issues and offer new perspectives for the development of well fracturing technology, aiding in the resolution of water flooding problems associated with well fracturing.

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Section: Study On Seepage Characteristics In Fracturing Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Law of Crack Propagation in Oil Well Fracturing Process

Zhao,

Li,

Luo

2024

Processes

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“…Researchers have explored the effects of various fracturing parameters (such as fracturing fluid type, injection rate, fracturing pressure, etc.) on fracturing outcomes through experiments and numerical simulations to optimize fracturing construction schemes and enhance oil and gas production capacity [10][11][12][13][14]. Some studies have focused on the distribution of fluids in the reservoir and their influence on the formation of hydraulic fracture networks.…”

Section: Introductionmentioning

confidence: 99%

Study on the Interaction Propagation Mechanism of Inter-Cluster Fractures under Different Fracturing Sequences

Cai,

Zhao,

et al. 2024

Processes

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Horizontal-well multi-cluster fracturing is one of the most important techniques for increasing the recovery rate in unconventional oil and gas reservoir development. However, under the influence of complex induced stress fields, the mechanism of interaction and propagation of fractures within each segment remains unclear. In this study, based on rock fracture criteria, combined with the boundary element displacement discontinuity method, a two-dimensional numerical simulation model of hydraulic fracturing crack propagation in a planar plane was established. Using this model, the interaction and propagation process of inter-cluster fractures under different fracturing sequences within horizontal well segments and the mechanism of induced stress field effects were analyzed. The influence mechanism of cluster spacing, fracture design length, and fracture internal pressure on the propagation morphology of inter-cluster fractures was also investigated. The research results indicate that, when using the alternating fracturing method, it is advisable to appropriately increase the cluster spacing to weaken the inhibitory effect of induced stress around the fractures created by prior fracturing on subsequent fracturing. Compared to the alternating fracturing method, the propagation morphology of fractures under the symmetrical fracturing method is more complex. At smaller cluster spacing, fractures created by prior fracturing are more susceptible to being captured by fractures from subsequent fracturing. The findings of this study provide reliable theoretical support for the optimization design of fracturing sequences and fracturing processes in horizontal well segments.

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An adaptive phase field approach to 3D internal crack growth in rocks

Xu,

Heap

et al. 2024

Computers and Geotechnics

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Simulation and optimization of fracture pattern in temporary plugging fracturing of horizontal shale gas wells

Cited by 9 publications

References 46 publications

Research on the Law of Crack Propagation in Oil Well Fracturing Process

Research on the Law of Crack Propagation in Oil Well Fracturing Process

Study on the Interaction Propagation Mechanism of Inter-Cluster Fractures under Different Fracturing Sequences

An adaptive phase field approach to 3D internal crack growth in rocks

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