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

Li, Zhiqiang; Zhang, Qi; Yan, Wende; Huang, Xiaoliang; Xiao, Qi; Mo, Fei; Fang, Feifei

doi:10.1002/ese3.793

Cited by 1 publication

(1 citation statement)

References 65 publications

(89 reference statements)

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“…The similarity between the multifracturing technique and the network fracturing technique is that both make full use of natural weak structural surfaces such as natural fractures and rock bedding . The goal is to increase the multilevel secondary microfractures around the artificial main fractures and finally to form a fracture system in which the artificial main fractures, natural weak structural surfaces, and multilevel secondary microfractures interweave and communicate with each other. , However, there are also fundamental differences between the multifracturing and network fracturing methods. Network fracturing aims to open up the connectivity of the cleats and form curved and coiled microfractures around the main fractures.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

Tian

Cao

et al. 2023

ACS Omega

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The geological conditions of coal reservoirs in China are complex, and the reservoir permeability is generally lower. Multifracturing is an effective method of improving reservoir permeability and coalbed methane (CBM) production. In this study, two types of dynamic loads, CO 2 blasting and a pulse fracturing gun (PF-GUN), were used to conduct multifracturing engineering tests in nine surface CBM wells in the Lu'an mining area in the central and eastern parts of the Qinshui Basin. The curves of pressure versus time of the two dynamic loads were obtained in the laboratory. The prepeak pressurization time of the PF-GUN was 200 ms, and that of the CO 2 blasting was 2.05 ms, which just falls in the optimum pressurization time of multifracturing. The microseismic monitoring results revealed that, in terms of the fracture morphology, both the CO 2 blasting and PF-GUN loads produced multiple sets of fractures in the near-well zone. In the six wells used for the CO 2 blasting tests, an average of three branch fractures were produced outside of the main fracture, and the average angle between the main fracture and the branch fractures exceeded 60°. In the three wells stimulated by PF-GUN, an average of two branch fractures were produced outside of the main fracture, and the average angle between the main fracture and the branch fractures was 25−35°. The multifracture characteristics of the fractures formed via CO 2 blasting were more obvious. However, a coal seam is a multifracture reservoir with a large filtration coefficient; the fracture will not extend after reaching the maximum scale under a certain gas displacement condition. Compared with the traditional hydraulic fracturing technique, the nine wells used in the multifracturing tests exhibited an obvious stimulation effect with an average increase of 51.4% in daily production. The results of this study provide an important technical reference for the efficient development of CBM in low-and ultralowpermeability reservoirs.

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Section: Introductionmentioning

confidence: 99%

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

Tian

Cao

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

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

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 1 publication

References 65 publications

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

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