Stress shadow

Yew, Ching H.

doi:10.1016/b978-0-12-420003-6.00008-2

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…In Test 3, the time for hydraulic fracture to propagate from the perforation cluster position to the bedding plane was approximately 4 s. Similarly, the time for fracture to propagate from the perforation cluster position the boundary of the specimen was about 19 s in Test 3. (5). In this experiment, the simultaneous initiation of multiple fractures could not be observed every time due to the size of the sample.…”

Section: Discussionmentioning

confidence: 77%

“…The strain value maintained a decreasing trend and finally formed a minimum value owing to the strain gauge was subjected to lateral compression by the opening hydraulic fracture. The time for CF-1 to propagate from the perforation cluster to the boundary of the specimen was about 19 s. (5). After the fracture propagated to the boundary of the sample, a stable fracture channel gradually formed.…”

Section: Strain Response Characteristicsmentioning

confidence: 99%

“…In the multi-cluster fracturing of a horizontal well, the fracturing fluid is pumped into the horizontal wellbore at high speed. Then, the fracturing fluid is sequentially injected into different stages to simultaneously activate multiple perforation clusters within one stage, thereby forming several closely spaced hydraulic fractures to maximize reservoir stimulation [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells

Wang

Yang

et al. 2021

Energies

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Competitive propagation of fractures initiated from multiple perforation clusters is universal in hydraulic fracturing of unconventional reservoirs, which largely influences stimulation. However, the propagation mechanism of multi-fractures has not been fully revealed for the lack of a targeted laboratory observation. In this study, a physical simulation experiment system was developed for investigating the initiation and propagation of multi-cluster hydraulic fractures. Different from the traditional hydro-fracking test system, the new one was equipped with a multi-channel shunting module and a strain monitoring system, which could guarantee the full fracture extension at each perforation clusters and measure the internal deformation of specimens, respectively. Several groups of true tri-axial fracturing tests were performed, considering the factors of in situ stress, cluster spacing, pumping rate, and bedding structures. The results showed that initiation of multi-cluster hydraulic fractures within one stage could be simultaneous or successive according to the difference of the breakdown pressure and fracturing fluid injection. For simultaneous initiation, the breakdown pressure of the subsequent fracture was lower than or equal to the value of the previous fracture. Multiple fractures tended to attract and merge. For successive initiation, the breakdown pressures of fractures were gradually increasing. The subsequent fracture tended to intersect with or deviated from the previous fracture. Multiple fractures interaction was aggravated by the decrease of horizontal stress difference, bedding number and cluster spacing, and weakened by the increase of pump rate. The propagation area of multiple fractures increased with the pump rate, decreased with the cluster spacing. The strain response characteristics corresponded with the initiation and propagation of fracture, which was conducive to understanding the process of the fracturing. The test results provide a basis for optimum design of hydraulic fracturing.

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Section: Discussionmentioning

confidence: 77%

Section: Strain Response Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells

Wang

Yang

et al. 2021

Energies

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“…Li et al [33] proposed a limited-entry multi-cluster fracturing method to improve the fracture geometry equilibrium. Cheng et al [34,35] studied the relationship between the stage sequence and the fracture geometry in the multi-stage fracturing of a horizontal well. They indicated that both the alternative fracturing [34] and Texas two-step fracturing techniques [35] could increase the stimulated reservoir volume by improving the fracture geometry equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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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Stress shadow

Cited by 2 publications

References 17 publications

Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells

Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells

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

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