An innovative technology of directional propagation of hydraulic fracture guided by radial holes in fossil hydrogen energy development

Liu, Xiaoqiang; Qu, Zhanqing; Guo, Tiankui; Tian, Qizhong; Lv, Wei; Xie, Zhishuang; Chu, Chunbo

doi:10.1016/j.ijhydene.2018.07.189

Cited by 37 publications

(17 citation statements)

References 11 publications

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“…Here, a model considering multiple factors such as geostress and rock mechanics properties is established by combining XFEM in ABAQUS with fluid-solid coupling, in which the criterion of maximum principal stress is applied to determine the position of rock fracture (fracture initiation), the criterion of maximum energy release rate is applied to judge the fracture damage evolution (fracture propagation morphology), and the fracture propagation in the radial borehole fracturing is studied [24]. The simulation provides a real and visual result, with the reference and guidance value.…”

Section: Geofluidsmentioning

confidence: 99%

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

2019

Geofluids

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The radial borehole fracturing technology has been applied in a certain number of oilfields with good results being achieved. However, the morphology and variation of fracture still require further study. In this paper, the reservoir model based on formation fluid-solid coupling equation is established with the extended finite element method (XFEM) in ABAQUS, and the fracture morphologies in the single-radial borehole, vertical multiradial borehole, and horizontal multiradial borehole are simulated and analyzed with criteria of maximum principal stress and maximum energy release rate as the damage mechanism. Moreover, the accuracy of numerical simulation results is verified with the large-scale true 3D physical simulation experiment. The results show that the induced stress field along the radial borehole during fracturing is the root cause of fracture directional propagation along the radial borehole whose effective guidance distance reaches 40 m. The vertical multiradial borehole can effectively enhance fracture directional propagation and is capable of reducing fracture initiation pressure. In the horizontal multiradial borehole, the major fracture propagating along each radial borehole is formed in the remote-borehole area, and the secondary fracture connecting the neighboring radial boreholes is formed in the near-borehole zone. Coordination of major and secondary fractures can effectively increase the drainage area and reduce the flow resistance in the near-borehole zone. Based on the research on fracture morphology of multiradial borehole fracturing, the scheme of radial borehole arrangement is optimized and verified through numerical simulation of deliverability. The final optimum borehole arrangement scheme is the intersectional angle of 45°between four orthogonal radial boreholes and horizontal maximum principal stress.

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Section: Geofluidsmentioning

confidence: 99%

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

2019

Geofluids

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“…Guo et al [23] analytically studied fracture initiation mechanisms of the hydraulic fracture under the guidance of a row of radial boreholes and demonstrated that radial boreholes have an excellent guidance to hydraulic fracture. Liu et al [24] established a model for radial drilling-fracturing by the ABAQUSextended finite element method and analyzed the influence extent of several factors on the directional propagation of hydraulic fracture based on their stimulation results. Taking the original fracture into account, Guo et al [25] presented the technology of hydraulic refracturing guided by directional boreholes and analytically demonstrated the feasibility of this novel technology.…”

Section: Introductionmentioning

confidence: 99%

“…Lithosphere demonstrated that prefractures have a substantial influence on the hydraulic fracture propagation behavior and geometry. Nevertheless, the present fracture initiation model for radial drilling-fracturing [23][24][25] can only consider the rock matrix failure according to the maximum tensile stress criterion and are inapplicable to the radial drilling-fracturing in shale formations. As natural weak planes, beddings are the locations where fracture tends to initiate, and the neglection of beddings will lead to an inaccurate prediction for fracturing initiation pressure and failure mode in the shale formation.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Model for Fracture Initiation of Radial Drilling-Fracturing in Shale Formations

et al. 2021

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Radial drilling-fracturing, the combination of radial drilling and hydraulic fracturing, can guide fractures toward the target area and effectively enhance the recovery of the low permeable reservoir. In this paper, based on the stress superposition principle, we establish an analytical model to predict fracture initiation pressure (FIP) and the shale failure mode for radial drilling-fracturing applied in shale formations. In contrast with the former studies, this model can additionally consider the failure from shale beddings and is more applicable in the shale reservoir. The model classifies the shale failure into three modes and, respectively, gives the criterion for each failure mode. Then, a series of sensitivity analyses is conducted by examining effects of various parameters. By analyzing the variation characteristic of the initiation pressures required for three failure modes, the main conclusions are as follows. Firstly, matrix failure and shear failure along bedding tend to take place when the azimuth of radial borehole is moderate. Small and large azimuths are favorable for the occurrence of tensile failure along bedding. Secondly, a high ratio of horizontal in situ stress predisposes shale to generate matrix failure, and bedding tensile failure and bedding shear failure are apt to occur when the ratio of horizontal in situ stress is low. Thirdly, with the increasing intersection angle of the radial borehole wall and bedding plane, the failure mode apt to occur changes from bedding tensile failure to bedding shear failure and then to matrix failure. Fourthly, shale prefers to yield bedding shear failure under a small Biot coefficient and generate the other two failure modes when Biot coefficient is large. Fifthly, permeability coefficient virtually has no influence on the failure mode of shale. The research clarifies the fracture initiation characteristics of radial drilling-fracturing in shale formations and provides a reference for the field application of radial drilling-fracturing.

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“…Under pressure relief of the guide holes, hydraulic fractures will directionally propagate along the line of the fracturing boreholes. The more guide holes, the better the effect of directional propagation and the larger the directional propagation range of hydraulic fracturing [23,24,29,30]. Recently, multihole linear directional hydraulic fracturing is proposed by Zhao et al This technology first arranges multiple fracturing holes in a straight line.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Basic Rules of Multihole Linear Codirectional Hydraulic Fracturing

Wang

Zhang

2020

Geofluids

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Directional rupture is one of the most important and common problems in rock breaking engineering. The purpose of directional rock breaking can be effectively realized by using multihole linear codirectional hydraulic fracturing. In this paper, realistic failure process analysis (RFPA) software is used to verify the experimental results of multihole linear codirectional hydraulic fracturing and investigate its basic law. The following results are demonstrated: (1) RFPA software can be very helpful to study the basic law of multihole linear codirectional hydraulic fracturing; (2) the process of multihole linear codirectional hydraulic fracturing can be divided into four stages: water injection boost, fracture initiation, stable fracture propagation, and fracture connection; and (3) multihole linear codirectional hydraulic fractures propagate along the direction of borehole distribution. Multihole codirectional hydraulic fracturing is influenced by the angle between the direction of the hole distribution and maximum principal stress, the difference of the principal stress, and the spacing of the boreholes. The smaller the angle, the difference value of the principal stress, and the hole spacing, the better the multihole codirectional hydraulic fracturing effect.

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An innovative technology of directional propagation of hydraulic fracture guided by radial holes in fossil hydrogen energy development

Cited by 37 publications

References 11 publications

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

An Analytical Model for Fracture Initiation of Radial Drilling-Fracturing in Shale Formations

Numerical Simulation on the Basic Rules of Multihole Linear Codirectional Hydraulic Fracturing

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