Improved Understanding of Fracturing Tight-Shale Gas Formations

Bai, M.

doi:10.2118/140968-ms

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…The method employs a staged coupling scheme, explicitly [52] solving the mechanical governing equation and implicitly [53][54][55][56] solving the fracture fluid flow equation, enhancing both simulation efficiency and stability. The fluid pressures are not equal in the structure and network fields, (p e n c1 ̸ = p i n c1 .…”

Section: Coupling Strategymentioning

confidence: 99%

Numerical Analysis of the Stress Shadow Effects in Multistage Hydrofracturing Considering Natural Fracture and Leak-Off Effect

Song,

Qiao,

Chen

et al. 2024

Water

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As a critical technological approach, multistage fracturing is frequently used to boost gas recovery in compact hydrocarbon reservoirs. Determining an ideal cluster distance that effectively integrates pre-existing natural fractures in the deposit creates a fracture network conducive to gas movement. Fracturing fluid leak-off also impacts water resources. In our study, we use a versatile finite element–discrete element method that improves the auto-refinement of the grid and the detection of multiple fracture movements to model staged fracturing in naturally fractured reservoirs. This computational model illustrates the interaction between hydraulic fractures and pre-existing fractures and employs the nonlinear Carter leak-off criterion to portray fluid leakage and the impacts of hydromechanical coupling during multistage fracturing. Numerical results show that sequential fracturing exhibits the maximum length in unfractured and naturally fractured models, and the leak-off volume of parallel fracturing is the smallest. Our study proposes an innovative technique for identifying and optimizing the spacing of fracturing clusters in unconventional reservoirs.

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Section: Coupling Strategymentioning

confidence: 99%

Numerical Analysis of the Stress Shadow Effects in Multistage Hydrofracturing Considering Natural Fracture and Leak-Off Effect

Song,

Qiao,

Chen

et al. 2024

Water

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“…It has been commonly observed in the petroleum industry that significant leakoff occurs during the process of hydraulic fracturing [16]. The amount of fracturing fluid that gets into the reservoir depends on the properties of formation and fracturing fluid.…”

Section: Leakoffmentioning

confidence: 99%

“…Fig 16. Fracture representation with three types of elements: fractured element, fracture front element and non-fractured element…”

mentioning

confidence: 99%

A Review of Hydraulic Fracturing Simulation

Chen

Dias

Sun

et al. 2021

Arch Computat Methods Eng

126

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Along with horizontal drilling techniques, multi-stage hydraulic fracturing has improved shale gas production significantly in past decades. In order to understand the mechanism of hydraulic fracturing and improve treatment designs, it is critical to conduct modelling to predict stimulated fractures. In this paper, related physical processes in hydraulic fracturing are firstly discussed and their effects on hydraulic fracturing processes are analysed. Then historical and state of the art numerical models for hydraulic fracturing are reviewed, to highlight the pros and cons of different numerical methods. Next, commercially available software for hydraulic fracturing design are discussed and key features are summarised. Finally, we draw conclusions from the previous discussions in relation to physics, method and applications and provide recommendations for further research.

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“…However, recovery of hydrocarbons in tight reservoirs has proven extremely difficult due to their low permeability. As a result, a horizontal drilling and hydraulic fracturing tandem has become a dominant means of modifying reservoir permeability to such a level that oil and gas can be produced without severe inflow difficulties (Bai 2011). Hydraulic fracturing generates a fracture network, which provides a conduit for open communication between the wellbore and reservoir rock, as well as for higher pressure drawdown and a larger area for gas desorption (Ding, Li et al 2012, King 2012.…”

Section: Introductionmentioning

confidence: 99%

A Workflow for Multi-Scale Modeling and Simulation of Transport Phenomena in Woodford Shale Rock Matrix

Goral¹,

Mišković²

2015

Unconventional Resources Technology Conference

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One of the most significant challenges facing the development of shale oil and gas resources worldwide is an inadequate understanding of complex flow and transport processes within shale reservoirs. For that reason, a proper understanding of the multi-scale transport phenomena within these highly heterogeneous formations is crucial from both scientific and economic perspective.Because anisotropy of shale rock exists across multiple scales, determining changes in pores distribution has proven to be difficult. Recent studies have indicated that shale rock pores significantly vary in number, size (from nano-, through micro-and meso-, to macro-pores), and kind (organic and inorganic). Thus far, the role of pore network and, more specifically, what pores contribute the most to the hydrocarbons storage or the production process, is not well understood and remains largely unknown. Hence, it is vital to address the need for understanding of how well different pores are connected and how they create possible flow pathways for the hydrocarbons migration.Here we present a comprehensive modeling and simulation framework for Woodford shale rock that links and correlates two most important parameters for characterizing flow in shale rock reservoirs: porosity and permeability. First, multi-scale 3D models are reconstructed from FIB-SEM, nano-and micro-XRM images of the Woodford shale rock specimen. Through this process, the mineralogy, porosity, and pore size distribution of the sample are obtained. Second, newly created 3D representations of the shale rock matrix are used as an input to the direct and indirect CFD solvers to simulate fluid flow and determine the shale rock permeability. Visualization of the resulting models revealed the full detail of the shale rock geometry and mineralogical composition.This work provides a guidance for reconstruction of realistic geometries, as well as a template for many different simulation studies relevant to unconventional reservoir characterization.

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Improved Understanding of Fracturing Tight-Shale Gas Formations

Cited by 9 publications

References 2 publications

Numerical Analysis of the Stress Shadow Effects in Multistage Hydrofracturing Considering Natural Fracture and Leak-Off Effect

Numerical Analysis of the Stress Shadow Effects in Multistage Hydrofracturing Considering Natural Fracture and Leak-Off Effect

A Review of Hydraulic Fracturing Simulation

A Workflow for Multi-Scale Modeling and Simulation of Transport Phenomena in Woodford Shale Rock Matrix

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