Numerical investigation for simultaneous growth of hydraulic fractures in multiple horizontal wells

Chen, Xiyu; Li, Yongming; Zhao, Jinzhou; Xu, Wenjun; Fu, Dongyu

doi:10.1016/j.jngse.2017.12.014

Cited by 36 publications

(26 citation statements)

References 16 publications

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“…Therefore, we divide the fracture of each cluster into two asymmetric fractures. In order to facilitate the study, the model has been properly and reasonably simplified and the following assumptions are made: (a) Natural fractures are vertical fractures, (b) in areas where natural fractures are not present, reservoir rocks are homogeneous, isotropic continuous linear elastic body, and (c) fracturing fluid is regarded as incompressible fluid …”

Section: Physical Modelmentioning

confidence: 99%

“…It is worth noting that the above scholars did not study the propagation of hydraulic fractures in the direction of the fracture height. For hydraulic fractures, the height change during hydraulic fracturing was very obvious, so it is necessary to study the three‐dimensional fracture propagation model. Some scholars , have studied the three‐dimensional fracture propagation, but they have not considered the influence of natural fractures.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation study on three‐dimensional fracture propagation of synchronous fracturing

Liu

Song³

2020

Energy Science & Engineering

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A new three‐dimensional fluid‐solid coupling fracture propagation model of synchronous fracturing was established to study the dynamic propagation process of simultaneous hydraulic fracturing. In this paper, we used an improved three‐dimensional boundary element method and a finite difference method, respectively, for calculating the deformation of the reservoir rock and the flow of the fracturing fluid during the fracturing process. The interaction between hydraulic fractures and nature fractures was also considered. Sensitivity analysis showed that during synchronous fracturing, the fractures between the wells attracted each other and injected with more fluid due to interference between the fractures. Affected by natural fractures, the trajectory of hydraulic fractures was more tortuous. Besides, the width and height of hydraulic fractures captured by natural fractures were reduced. In order to reduce the difference in length between individual fractures, smaller well spacing and larger cluster spacing should be used.

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Section: Physical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation study on three‐dimensional fracture propagation of synchronous fracturing

Liu

Song³

2020

Energy Science & Engineering

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“…However, the efficiency of intensive-stage fracturing technology urgently needs to be improved. Previous studies indicated that some perforation clusters could not create high-conductivity fractures or even initiate fractures [2,4,5]. This phenomenon increases the perforation cost and wastes the reservoir volume.…”

Section: Introductionmentioning

confidence: 99%

“…This effect may decrease the fracture geometry equilibrium. The lower the fracture geometry equilibrium is, the more inadequate the reservoir stimulation [5]. The perforation friction can be optimized by adjusting the perforation diameter and number [5,32,33] to achieve uniform liquid injection into each perforation cluster.…”

Section: Introductionmentioning

confidence: 99%

“…The lower the fracture geometry equilibrium is, the more inadequate the reservoir stimulation [5]. The perforation friction can be optimized by adjusting the perforation diameter and number [5,32,33] to achieve uniform liquid injection into each perforation cluster. Li et al [33] proposed a limited-entry multi-cluster fracturing method to improve the fracture geometry equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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Perforation Optimization of Intensive-Stage Fracturing in a Horizontal Well Using a Coupled 3D-DDM Fracture Model

2021

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Intensive-stage fracturing in horizontal wells is a potentially new technology for reservoir stimulations of deep shale oil and gas. Due to a strong stress interaction among the dense fractures, the fracture geometry and stress field are very complicated, which are the bottlenecks of this technology. Aiming at simulating the intensive-stage fracturing, a coupled three-dimensional (3D) fracture model of multiple-fracture simultaneous propagation is proposed. The dynamic behavior of the fracture propagation and stress field was analyzed using this model. The perforation parameters were optimized for improving the fracture geometry equilibrium. The results showed that the exterior fractures of the multiple fractures penetrated by the horizontal well become the main fractures, while the interior fractures are drastically restrained. The exterior fracture widths increased with increasing injection time, while the interior fracture widths decreased with increasing injection time. An extruded region was created among the multiple fractures, which restrained the propagation of the interior fractures. Only increasing the perforation cluster number did not improve the fracture geometry equilibrium in the intensive-stage fracturing. To improve the fracture geometry equilibrium, we suggest designing more perforation numbers in each perforation cluster and ensuring that both the perforation number and diameter in the interior perforation cluster are greater than those of the exterior ones.

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Pulse injection simulation based on the coupling of transient flow in tubing and fracture propagation in reservoirs

Zhu

Dong

2022

Energy Science & Engineering

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Pulse injection can reduce the maximum operating pressure at the wellhead, which is conducive to solving the operational difficulties caused by the high breakdown pressure. The new injection mode causes a transient fluid flow in the tubing, and it interacts with the initiation and propagation of hydraulic fractures. However, there is still a lack of theoretical models to consider the above factors so that its mechanism cannot be explained. In this study, the transient flow model in the tubing was first established. Subsequently, the fracture propagation model was completed based on particle flow code (PFC). Moreover, the transient flow model was embedded into the PFC simulation software via its code script FISH. Finally, their coupled simulation model was established. Based on this model, the effects of injection flow rates on the fluid pressure in the tubing and the initiation and propagation of hydraulic fractures were discussed. Furthermore, the influence of parameters in the pulse injection scheme on the maximum wellhead pressure was studied by the orthogonal design method. The results show that with the increase of the injection flow rate, the fluid pressurization rate in the tubing and the fracture propagation rate both raise, which also causes a significant increase of the maximum wellhead pressure. Compared with a stable injection mode, pulse injection can evidently reduce the maximum wellhead pressure.The influence degree of each parameter on the maximum wellhead pressure in the pulse scheme is as follows: t 2 > Δq > Δt 4 > Δt 5 > Δt 3 . The research results of this paper have guiding significance for the engineering application and parameter design of pulse injection hydraulic fracturing.

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Numerical investigation for simultaneous growth of hydraulic fractures in multiple horizontal wells

Cited by 36 publications

References 16 publications

Numerical simulation study on three‐dimensional fracture propagation of synchronous fracturing

Numerical simulation study on three‐dimensional fracture propagation of synchronous fracturing

Perforation Optimization of Intensive-Stage Fracturing in a Horizontal Well Using a Coupled 3D-DDM Fracture Model

Pulse injection simulation based on the coupling of transient flow in tubing and fracture propagation in reservoirs

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