Mathematical model of fracture complexity indicator in multistage hydraulic fracturing

Feng, Fuping; Wang, Xuanbin; Guo, Boyun; Ai, Chi

doi:10.1016/j.jngse.2016.12.012

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…The observation is consistent with the model prediction given by Feng et al 9 Industry experiences from massive fracturing operation on shale gas/oil wells also confirm this trend. This is explained by the fact that high flow rate creates high flow friction and thus high resistance to flow, reducing the growth rate of long fractures.…”

Section: Discussionsupporting

confidence: 92%

“…This is explained by the fact that high flow rate creates high flow friction and thus high resistance to flow, reducing the growth rate of long fractures. The observation is consistent with the model prediction given by Feng et al 9 Industry experiences from massive fracturing operation on shale gas/oil wells also confirm this trend. The sensitivity analyses also show that use of dilatant fracturing fluids (n > 1) can reduce fracture length and thus increase fracture population for a given amount of fluid volume.…”

Section: Discussionsupporting

confidence: 92%

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An analytical model for describing sequential initiation and simultaneous propagation of multiple fractures in hydraulic fracturing shale oil/gas formations

Xiao

Guo

Zhang

2019

Energy Science & Engineering

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Frac‐driven interactions (FDI) cause sharp declines in gas and oil production rates followed by slow recovery or no recovery. How to minimize the FDI is an open problem for researchers and engineers to solve in the energy industry. An analytical model is presented in this paper for simulating simultaneous propagations of multiple fractures to identify factors affecting FDI. Result of sensitivity analyses with the model indicates that increasing fluid injection rate can depress the growth of long fractures and thus reduce FDI intensity. Using dilatant fracturing fluids can slow down the growth of long fractures and thus reduce the chance of FDI. In order to better apply the model to solving the FDI problem, future research should include determination of the critical fracture width in different types of shale gas/oil formations.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 92%

An analytical model for describing sequential initiation and simultaneous propagation of multiple fractures in hydraulic fracturing shale oil/gas formations

Xiao

Guo

Zhang

2019

Energy Science & Engineering

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“…When the fracture aperture reached a certain threshold without penetrating the quar particles, primarily influenced by the maximum horizontal principal stress, the fracture path underwent alteration. The fluid chose a path with lower energy requirements for further fracturing [55], resulting in the branching and reduction in the overall length of the hydraulic fractures (Figure 6b). When hydraulic fractures approached mica, the weaker mineral mica was directly penetrated by Based on the various fracture patterns observed, it was evident that under the influence of horizontal stress, fractures meandered in their propagation along the Y-axis.…”

Section: The Influence Of Single Mineralmentioning

confidence: 99%

Effect of Non-Uniform Minerals Distribution on Hydraulic Fracture Evolution during Unconventional Geoenergy Exploration

Gao,

Li,

et al. 2023

Processes

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To study the effect of the non-uniform distribution of minerals on the development of microcracks within the rock during hydraulic fracturing, a novel numerical model considering multiple random mineral distributions was designed. The model investigated the impacts of mineral grain size, composition, and spatial arrangement on fracture initiation and propagation. The results indicate that the presence of the hard-phase mineral quartz can alter the propagation path of fractures, and increase the width of hydraulic fractures. In coarse-grained granite, the range of crack deflection is maximized, while in medium-grained granite, it is more prone to forming convoluted elongated cracks. A higher quartz content in granite further contributes to the formation of complex crack networks. Simultaneously, the evolution of granite fractures and variations in breakdown pressure in heterogeneous granite were investigated, considering the influence of core parameters such as fluid injection rate, fracturing fluid viscosity, and horizontal stress difference. The research reveals that a high injection rate promotes straight-line fracture expansion. Moreover, modest fluctuations in fracturing fluid viscosity have minimal effects on fracture morphology. When the fracture development avoids quartz, under the influence of high horizontal stress differential, it clearly turns toward the direction of the maximum principal stress. This study can offer insights into innovative and optimized deep reservoir fracturing techniques.

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“…However, in situations where a significant portion of hydraulic fractures is damaged during well startup, resulting in disconnections of such fractures from the wellbore, having small spacing between perforation clusters still appears to be beneficial because disconnected fractures still may contribute to production through other nondamaged perforation clusters [17]. The issues of fracture complexity, interaction, and disconnection are quite difficult to consider in mathematical modeling because there is a lack of data to explicitly describe their configurations and dynamics [18]. These complication issues are assumed to be negligible in the analysis that follows.…”

Section: Fracturing Designmentioning

confidence: 99%

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Yang

Guo

2019

Energies

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A data-driven workflow approach is presented in this study for optimizing fracture spacing of multifractured horizontal wells (MFHW) in shale oil reservoirs. The workflow employs a simple well productivity model for the initial design of hydraulic fracturing well completions. This provides a transparent approach to the identification of key fracturing parameters affecting well productivity. The workflow uses transient pressure or production data to identify fracture interference. This offers a reliable and cost-effective means for assessment of well production potential in terms of optimization of fracture spacing in the MFHW. Result of a field case study indicated that three wells were drilled in an area with dense natural fractures, and the fracture spacing of MFHW in this area was short enough to effectively drain the stimulated reservoir volume (SRV), while the other three wells were drilled in an area with less natural fractures, and the fracture spacing of MFHW in this area could be shortened to double well productivity.

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Mathematical model of fracture complexity indicator in multistage hydraulic fracturing

Cited by 8 publications

References 21 publications

An analytical model for describing sequential initiation and simultaneous propagation of multiple fractures in hydraulic fracturing shale oil/gas formations

An analytical model for describing sequential initiation and simultaneous propagation of multiple fractures in hydraulic fracturing shale oil/gas formations

Effect of Non-Uniform Minerals Distribution on Hydraulic Fracture Evolution during Unconventional Geoenergy Exploration

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

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