Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Three-Dimensional Experimental and Numerical Investigations on Fracture Initiation and Propagation for Oriented Limited-Entry Perforation and Helical Perforation
https://orcid.org/0000-0002-4998-6259
Abstract The competitive initiation from multiple perforation tunnels and the non-planar propagation near the wellbore for different perforation technologies are not fully understood. Laboratory physical experiment can demonstrate the complex fracture behaviors, but there are many challenges in systematic investigation due to the difficulty in obtaining the spatiotemporal evolution of fracture development during the experimental process, the high cost of lab tests, and that the laboratory results are usually affected by random defects of rock specimens. Therefore, a 3D numerical model of perforated fracturing, which is the same scale as the physical experiments, is proposed as a powerful supplement to laboratory experiment. A verification against laboratory experimental results suggests the fidelity of numerical model. Two perforation technologies including oriented limited-entry (OLE) perforation and helical perforation are explored and compared by true-triaxial physical experiments and numerical simulations. We analyze the impacts of the horizontal stress difference and engineering factors such as the injection rate, number of clusters, perforation diameter, perforation length, and perforation density on the near-wellbore fracture morphology, cluster efficiency, and injection pressure. The results show that multiple planar fractures are created for OLE perforation, whereas various fracture morphologies including planar fractures, spiral fractures, and stepped spiral fractures composed of multiple parallel fractures, are generated for helical perforation. High cluster efficiency is generally achieved by OLE perforation, even up to 100%, which is significantly higher than helical perforation at 50%. Perforation diameter and the number of clusters per stage are the extremely important factors influencing the stimulation effect for OLE perforation. Compared with helical perforation, the extension pressure of OLE perforation is always maintained at a high level, facilitating the simultaneous growth of multiple fractures. Our results provide theoretical guidance for optimal design of operational parameters for perforated completion in geological reservoirs.
Highlights Large-scale true triaxial physical experiments of perforated fracturing, focusing on fracture growth from perforations, are conducted.A 3D numerical model of perforated fracturing is established as a powerful supplement to the laboratory physical experiment.Effects on fracture morphology, cluster efficiency and injection pressure for two perforation technologies are revealed.
Three-Dimensional Experimental and Numerical Investigations on Fracture Initiation and Propagation for Oriented Limited-Entry Perforation and Helical Perforation
https://orcid.org/0000-0002-4998-6259
Abstract The competitive initiation from multiple perforation tunnels and the non-planar propagation near the wellbore for different perforation technologies are not fully understood. Laboratory physical experiment can demonstrate the complex fracture behaviors, but there are many challenges in systematic investigation due to the difficulty in obtaining the spatiotemporal evolution of fracture development during the experimental process, the high cost of lab tests, and that the laboratory results are usually affected by random defects of rock specimens. Therefore, a 3D numerical model of perforated fracturing, which is the same scale as the physical experiments, is proposed as a powerful supplement to laboratory experiment. A verification against laboratory experimental results suggests the fidelity of numerical model. Two perforation technologies including oriented limited-entry (OLE) perforation and helical perforation are explored and compared by true-triaxial physical experiments and numerical simulations. We analyze the impacts of the horizontal stress difference and engineering factors such as the injection rate, number of clusters, perforation diameter, perforation length, and perforation density on the near-wellbore fracture morphology, cluster efficiency, and injection pressure. The results show that multiple planar fractures are created for OLE perforation, whereas various fracture morphologies including planar fractures, spiral fractures, and stepped spiral fractures composed of multiple parallel fractures, are generated for helical perforation. High cluster efficiency is generally achieved by OLE perforation, even up to 100%, which is significantly higher than helical perforation at 50%. Perforation diameter and the number of clusters per stage are the extremely important factors influencing the stimulation effect for OLE perforation. Compared with helical perforation, the extension pressure of OLE perforation is always maintained at a high level, facilitating the simultaneous growth of multiple fractures. Our results provide theoretical guidance for optimal design of operational parameters for perforated completion in geological reservoirs.
Highlights Large-scale true triaxial physical experiments of perforated fracturing, focusing on fracture growth from perforations, are conducted.A 3D numerical model of perforated fracturing is established as a powerful supplement to the laboratory physical experiment.Effects on fracture morphology, cluster efficiency and injection pressure for two perforation technologies are revealed.
Three-Dimensional Experimental and Numerical Investigations on Fracture Initiation and Propagation for Oriented Limited-Entry Perforation and Helical Perforation
https://orcid.org/0000-0002-4998-6259
Abstract The competitive initiation from multiple perforation tunnels and the non-planar propagation near the wellbore for different perforation technologies are not fully understood. Laboratory physical experiment can demonstrate the complex fracture behaviors, but there are many challenges in systematic investigation due to the difficulty in obtaining the spatiotemporal evolution of fracture development during the experimental process, the high cost of lab tests, and that the laboratory results are usually affected by random defects of rock specimens. Therefore, a 3D numerical model of perforated fracturing, which is the same scale as the physical experiments, is proposed as a powerful supplement to laboratory experiment. A verification against laboratory experimental results suggests the fidelity of numerical model. Two perforation technologies including oriented limited-entry (OLE) perforation and helical perforation are explored and compared by true-triaxial physical experiments and numerical simulations. We analyze the impacts of the horizontal stress difference and engineering factors such as the injection rate, number of clusters, perforation diameter, perforation length, and perforation density on the near-wellbore fracture morphology, cluster efficiency, and injection pressure. The results show that multiple planar fractures are created for OLE perforation, whereas various fracture morphologies including planar fractures, spiral fractures, and stepped spiral fractures composed of multiple parallel fractures, are generated for helical perforation. High cluster efficiency is generally achieved by OLE perforation, even up to 100%, which is significantly higher than helical perforation at 50%. Perforation diameter and the number of clusters per stage are the extremely important factors influencing the stimulation effect for OLE perforation. Compared with helical perforation, the extension pressure of OLE perforation is always maintained at a high level, facilitating the simultaneous growth of multiple fractures. Our results provide theoretical guidance for optimal design of operational parameters for perforated completion in geological reservoirs.
Highlights Large-scale true triaxial physical experiments of perforated fracturing, focusing on fracture growth from perforations, are conducted.A 3D numerical model of perforated fracturing is established as a powerful supplement to the laboratory physical experiment.Effects on fracture morphology, cluster efficiency and injection pressure for two perforation technologies are revealed.
Three-Dimensional Experimental and Numerical Investigations on Fracture Initiation and Propagation for Oriented Limited-Entry Perforation and Helical Perforation
Wang, Xiaohua (Autor:in) / Tang, Meirong (Autor:in) / Du, Xianfei (Autor:in) / Zhang, Fengshou (Autor:in) / Hou, Bing (Autor:in) / Tang, Jizhou (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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Hydraulic Fracture Initiation and Propagation from Wellbore with Oriented Perforation
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Effects of Perforation Pollution Zone on Fracture Initiation
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