Interaction between Induced Hydraulic Fracture and Pre-Existing Natural Fracture in a Poro-elastic Environment: Effect of Pore Pressure Change and the Orientation of Natural Fracture

Rahman, Mohammad Mustafizur; Aghighi, Mohammad Ali; Rahman, Sheik S.; Ravoof, Shaik Abdul

doi:10.2118/122574-ms

Cited by 29 publications

(8 citation statements)

References 14 publications

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“…For naturally fractured formations under reservoir conditions, natural fractures are narrow apertures which are around 10 -5 to 10 -3 m wide and have high length/width ratios (>1000:1) [1].Typically natural fractures are partially or completely sealed but this does not mean that they can be ignored while designing well completion processes since they act as planes of weakness reactivated during hydraulic fracturing treatments that improves the efficiency of stimulation [2]. The problem of hydraulic and natural fracture interaction has been widely investigated both experimentally [3,4,5,6,7,8] and numerically [9,10,11,12,13,14,15,16,17,18]. Many field experiments also demonstrated that a propagating hydraulic fracture encountering natural fractures may lead to arrest of fracture propagation, fluid flow into natural fracture, creation of multiple fractures and fracture offsets [19,20,21,22] which will result in a reduced fracture width.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic and Natural Fracture Interaction: Numerical Modeling or Artificial Intelligence?

Keshavarzi¹,

Jahanbakhshi²

2013

Effective and Sustainable Hydraulic Fracturing

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Hydraulic fracturing of naturally fractured reservoirs is a critical issue for petroleum industry, as fractures can have complex growth patterns when propagating in systems of natural fractures. Hydraulic and natural fracture interaction may lead to significant diversion of hydraulic fracture paths due to intersection with natural fractures which causes difficulties in proppant transport and eventually job failure. In this study, a comparison has been made between numerical modeling and artificial intelligence to investigate hydraulic and natural frcature interaction. First of all an eXtended Finite Element Method XFEM model has been developed to account for hydraulic fracture propagation and interaction with natural fracture in naturally fractured reservoirs including fractures intersection criteria into the model. It is assumed that fractures are propagating in an elastic medium under plane strain and quasi-static conditions. Comparison of the numerical and experimental studies results has shown good agreement. Secondly, a feed-forward with back-propagation artificial neural network approach has been developed to predict hydraulic fracture path crossing/turning into natural fracture due to interaction with natural fracture based on experimental studies. Effective parameters in hydraulic and natural fracture interaction such as in situ horizontal differential stress, angle of approach, interfacial coefficient of friction, young's modulus of the rock and flow rate of fracturing fluid are the inputs and hydraulic fracturing path crossing/turning into natural fracture is the output of the developed artificial neural network. The results have shown high potentiality of the developed artificial neural network approach to predict hydraulic fracturing path due to interaction with natural fracture. Finally, both of the approaches have been examined by a set of experimental study data and the results have been compared. It is clearly observed that both of them yield promising results

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Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic and Natural Fracture Interaction: Numerical Modeling or Artificial Intelligence?

Keshavarzi¹,

Jahanbakhshi²

2013

Effective and Sustainable Hydraulic Fracturing

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“…(3) Constitutive equation (Rahman et al, 2009) The stress and strain of elastic material are linearly related:…”

Section: Deformation Field Equationmentioning

confidence: 99%

Numerical simulation of horizontal well network fracturing in glutenite reservoir

Qi¹,

Li²,

Li³

et al. 2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Hydraulic fracturing is an economically effective technology developing the glutenite reservoirs, which have far stronger heterogeneity than the conventional sandstone reservoir. According to the field production experience of Shengli Oilfield, horizontal-well fracturing is more likely to develop a complex fractured network, which improves the stimulated volume of reservoir effectively. But the clear mechanism of horizontal-well hydraulic fracture propagation in the glutenite reservoirs is still not obtained, thus it is difficult to effectively carry out the design of fracturing plan. Based on the characteristics of the glutenite reservoirs, a coupled Flow-Stress-Damage (FSD) model of hydraulic fracture propagation is established. The numerical simulation of fracturing expansion in the horizontal well of the glutenite reservoir is conducted. It is shown that a square mesh-like fracture network is developed near the horizontal well in the reservoir with lower stress difference, in which fracture is more prone to propagate along the direction of the minimum principal stress as well. High fracturing fluids injection displacement and high fracturing fluid viscosity lead to the rise of static pressure of the fracture, which results in the rise of fracture complexity, and greater probability to deflect when encountering gravels. As the perforation density increases, the micro-fractures generated at each perforation gather together faster, and the range of the stimulated reservoir is also relatively large. For reservoirs with high gravel content, the complexity of fracture network and the effect of fracture communication are obviously increased, and the range of fracture deflection is relatively large. In the case of the same gravel distribution, the higher the tensile strength of the gravel, the greater fracture tortuosity and diversion was observed. In this paper, a simulation method of horizontal well fracture network propagation in the reservoirs is introduced, and the result provides the theoretical support for fracture network morphology prediction and plan design of hydraulic fracturing in the glutenite reservoir.

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“…In recent years, many researchers began to study the effects of natural fractures on hydraulic fracture propagation using the numerical simulation method, [9][10][11][12][13] and proposed mathematical models to simulate the fracture network propagation. Based on a discrete element numerical simulation and experimental test, Fatahi et al 14 considered that under the condition of a high approach angle, a hydraulic fracture easily passes through a natural fracture,in addition, the filling material in the fracture has a significant effect on the fracture propagation behavior.…”

Section: Introductionmentioning

confidence: 99%

New algorithm to simulate fracture network propagation using stationary and moving coordinates in naturally fractured reservoirs

Zhang

Yan

et al. 2020

Energy Science & Engineering

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Interaction between Induced Hydraulic Fracture and Pre-Existing Natural Fracture in a Poro-elastic Environment: Effect of Pore Pressure Change and the Orientation of Natural Fracture

Cited by 29 publications

References 14 publications

Investigation of Hydraulic and Natural Fracture Interaction: Numerical Modeling or Artificial Intelligence?

Investigation of Hydraulic and Natural Fracture Interaction: Numerical Modeling or Artificial Intelligence?

Numerical simulation of horizontal well network fracturing in glutenite reservoir

New algorithm to simulate fracture network propagation using stationary and moving coordinates in naturally fractured reservoirs

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