Numerical and experimental investigation of the interaction of natural and propagated hydraulic fracture

Fatahi, Hassan; Hossain, Mofazzal; Sarmadivaleh, Mohammad

doi:10.1016/j.jngse.2016.11.054

Cited by 90 publications

(38 citation statements)

References 11 publications

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“…Lee et al (2015) utilized naturally fractured Marcellus shale rocks to conduct unconfined compressive strength (UCS) and SCB tests. Fatahi et al (2017) and Wang et al (2018b) coupled numerical and experimental approach to study propagating HF interaction with pre-existing NF. The authors' experimental results were converted to field scale using numerical methods.…”

Section: Methods Of Approachmentioning

confidence: 99%

“…At low (20°) approach angle, the right side of a propagating dual-winged HF was arrested at NF interface, while the left side of the HF will deflect fluid into the proximate NF after intersection. When the angles between the NF plane and the maximum horizontal stress direction decrease, the HF will get arrested at the NF plane (Wang et al 2018a;Fatahi et al 2017). Olson et al (2012) concluded from a hydrostone block experiment results that oblique HF-NF intersections will lead to arrest or diversion of the propagating HF along the NF interface at sub-orthogonal.…”

Section: Arrest Of Hfmentioning

confidence: 99%

“…When the boundary of crossing exceeds the differential horizontal stress at approach angles greater than 45° (> 45°), the HF will cross the NF after intersection (Zhao et al 2016(Zhao et al , 2019a. In Fatahi et al (2017), results from discrete element method (DEM) and true triaxial stress cell (TTSC) shows that the propagating HF will be more likely to cross the natural fracture as the angles between the NF plane and the maximum horizontal stress direction increases. At orthogonal angle in Cheng et al (2014a), the two (2) HFs crossed the NF plane after intersection due to the elliptical HF tip and alternating lownormal and high-shear stresses by the two propagating HF tips.…”

Section: Hf Crossing the Nfmentioning

confidence: 99%

See 2 more Smart Citations

Interaction between hydraulic fractures and natural fractures: current status and prospective directions

Kolawole

Ispas

2019

J Petrol Explor Prod Technol

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Hydraulic fracturing treatment is one of the most efficient conventional matrix stimulation techniques currently utilized in the petroleum industry. However, due to the spatiotemporal complex nature of fracture propagation in a naturally-and often times systematically fractured media, the influence of natural fractures (NF) and in situ stresses on hydraulic fracture (HF) initiation and propagation within a reservoir during the hydrofracturing process remains an important issue. Over the past 50 years of advances in the understanding of HF-NF interactions, no comprehensive revision of the state of the knowledge exists. Here, we reviewed over 140 scientific articles on investigations of HF-NF interactions, published over the past 50 years. We highlight the most commonly observed HF-NF interactions and their implications for unconventional oil and gas production. Using observational and quantitative analyses, we find that numerical modeling and simulation is the most prominent method of approach, whereas there are less publications on the experimental approach, and analytical method is the least utilized approach. Further, we suggest how HF-NF interactions can be monitored in real time on the field during a pre-frac test. Lastly, based on the results of our literature review, we recommend promising areas of investigation that may provide more profound insights into HF-NF interactions in such a way that can be directly applied to the optimization of fracture-stimulation field operations.

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Section: Methods Of Approachmentioning

confidence: 99%

Section: Arrest Of Hfmentioning

confidence: 99%

Section: Hf Crossing the Nfmentioning

confidence: 99%

See 1 more Smart Citation

Interaction between hydraulic fractures and natural fractures: current status and prospective directions

Kolawole

Ispas

2019

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

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“…For example, Zhang et al 38 combined PFC and FLAC to study the behavior of a hydraulic fracture crossing natural fractures. Fatahi et al 39 investigated the interaction mechanisms of HF and NF by using PFC2D. DEM may be useful for understanding the mechanisms of intersection behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the effect of perforation erosion, Long and Xu 37 formulated a DDM approach to model the simultaneous propagation of multiple hydraulic fractures. Fatahi et al 39 investigated the interaction mechanisms of HF and NF by using PFC2D. However, the crossing criterion may begin to lose effectiveness under complex fracture network condition, because the local stress field varies due to the opening or shear slip of surrounding fractures.…”

mentioning

confidence: 99%

A 2D explicit numerical scheme–based pore pressure cohesive zone model for simulating hydraulic fracture propagation in naturally fractured formation

Liu

Deng

et al. 2019

Energy Science & Engineering

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In this work, a 2D pore pressure cohesive zone model is presented to simulate the hydraulic fracture propagation in naturally fractured formation, in which the fracturing process is governed by a bilinear cohesive zone model equipped with Coulomb's friction law and the fluid flow within the hydraulic fracture is described by the lubrication equation. In this model, fluid leak‐off into rock matrix is ignored and a fully explicit temporal integration scheme is adopted to overcome the convergence issue of conventional implicit scheme (eg, Newton‐Raphson method). The advantage of the proposed model is that it does not require any special crossing criterion to determine the interaction behavior when the hydraulic fracture hits the natural fracture. Implementation of the model was described in detail, and then, the model was verified with well‐known analytical solution of KGD problem and criteria of hydraulic fracture crossing natural fracture. The capability of the proposed model to capture the interaction behavior between hydraulic fracture and natural fracture was demonstrated by the good agreement of the modeling result and analytical solution. Several numerical cases were performed to investigate the impact of key factors on fracture network evolution during hydraulic fracturing treatment. Results show that fracture network is not only governed by the spatial distribution of natural fracture, but also greatly affected by the initial hydraulic aperture of natural fracture and in situ stress contrast.

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Effect of joints on microwave fracturing of the Bukit Timah granite using an open‐ended antenna

Zheng

et al. 2022

Deep Underground Science and Engineering

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Microwave fracturing of rocks before mechanical breakage could improve the performance of mechanical excavators and reduce environmental impacts. Previous research focused on the microwave fracturing of intact rock blocks.By using an open-ended antenna, this paper investigates the effect of pre-existing joints on the microwave fracturing of the Singapore Bukit Timah granite blocks. The results show that the specimens are weakened in the manners of cracking, spalling, melting, or a combination of them. The crack number and the total crack length produced by microwave treatment of jointed rock blocks are slightly smaller than those in the intact rock blocks. The interaction between joints and microwave-induced cracks can be summarized into the following four patterns:(1) microwave-induced cracks become arrested so that the crack propagation is terminated; (2) microwave-induced cracks penetrate the joints and continue to propagate; (3) microwave-induced cracks become deflected along the joints; and (4) microwave-induced cracks propagate forward following the joints. The smaller the approach angle between the microwave-induced crack and the preexisting joint is, the more microwave-induced cracks tend to be arrested at the joint. Increasing the approach angle between the microwave-induced crack and the joint can increase the chance of microwave-induced crack penetrating the joint. The results also show that the smaller the distance is between the microwave radiation point and the joint, the easier it is for microwave-induced cracks to penetrate the joints; otherwise, the microwave-induced crack is more likely to be arrested at the pre-existing joint.

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Numerical and experimental investigation of the interaction of natural and propagated hydraulic fracture

Cited by 90 publications

References 11 publications

Interaction between hydraulic fractures and natural fractures: current status and prospective directions

Interaction between hydraulic fractures and natural fractures: current status and prospective directions

A 2D explicit numerical scheme–based pore pressure cohesive zone model for simulating hydraulic fracture propagation in naturally fractured formation

Effect of joints on microwave fracturing of the Bukit Timah granite using an open‐ended antenna

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