Evolution mechanism of optical fiber strain induced by multi-fracture growth during fracturing in horizontal wells

Chen, Ming; Guo, Tiankui; Xu, Yizhuang; Qu, Zhanqing; Zhang, Shicheng; Zhou, Taofa; WANG, Yunpeng

doi:10.1016/s1876-3804(22)60017-x

Cited by 13 publications

(4 citation statements)

References 23 publications

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“…The purpose of multifracturing is to form multiple main radial fractures around the wellbore and then to extend microfractures from the multiple main fractures. 12,13 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. 13 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.…”

Section: Introductionmentioning

confidence: 99%

“…The core of network fracturing technology is a horizontal well and multistage fracturing. − The basic theory is to use multistage fracturing to form stress interference in the reservoir. − Through bending and expansion of the fractures formed via fracturing, the primary fractures in the reservoir are connected to the maximum extent possible, thus increasing the permeability and conductivity of the reservoir. The purpose of multifracturing is to form multiple main radial fractures around the wellbore and then to extend microfractures from the multiple main fractures. , …”

Section: Introductionmentioning

confidence: 99%

“…The purpose of multifracturing is to form multiple main radial fractures around the wellbore and then to extend microfractures from the multiple main fractures. 12 , 13 …”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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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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“…Currently, there are two main techniques for characterizing hydraulic fractures: direct observation and indirect observation. Direct observation techniques include microseismic observation [10,11], fiber-optic temperature/strain observation [12,13], and downhole imaging observation [14]. Among them, microseismic observation can only provide probable locations of rock shearing activity, and the accuracy of determining hydraulic fracture size is not high enough.…”

mentioning

confidence: 99%

Simulation Method and Feature Analysis of Shutdown Pressure Evolution During Multi-Cluster Fracturing Stimulation

He,

Zou,

et al. 2024

ENERGY

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Multistage multi-cluster hydraulic fracturing has enabled the economic exploitation of shale reservoirs, but the interpretation of hydraulic fracture parameters is challenging. The pressure signals after pump shutdown are influenced by hydraulic fractures, which can reflect the geometric features of hydraulic fracture. The shutdown pressure can be used to interpret the hydraulic fracture parameters in a real-time and cost-effective manner. In this paper, a mathematical model for shutdown pressure evolution is developed considering the effects of wellbore friction, perforation friction and fluid loss in fractures. An efficient numerical simulation method is established by using the method of characteristics. Based on this method, the impacts of fracture half-length, fracture height, opened cluster and perforation number, and filtration coefficient on the evolution of shutdown pressure are analyzed. The results indicate that a larger fracture half-length may hasten the decay of shutdown pressure, while a larger fracture height can slow down the decay of shutdown pressure. A smaller number of opened clusters and perforations can significantly increase the perforation friction and decrease the overall level of shutdown pressure. A larger filtration coefficient may accelerate the fluid filtration in the fracture and hasten the drop of the shutdown pressure. The simulation method of shutdown pressure, as well as the analysis results, has important implications for the interpretation of hydraulic fracture parameters.

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Study on Fracturing Time and Quantitative Method of Polymer Flooding

Hou

2024

Springer Series in Geomechanics and Geoengineering

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Evolution mechanism of optical fiber strain induced by multi-fracture growth during fracturing in horizontal wells

Cited by 13 publications

References 23 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

Simulation Method and Feature Analysis of Shutdown Pressure Evolution During Multi-Cluster Fracturing Stimulation

Study on Fracturing Time and Quantitative Method of Polymer Flooding

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