Stress interference calculation model and its application in volume stimulation of horizontal wells

Xu, Yizhuang; Chen, Ming; Wu, Qi; Li, Deqi; Yang, Nengyu; Weng, Dingwei; Guan, Bowen

doi:10.1016/s1876-3804(16)30101-x

Cited by 32 publications

(9 citation statements)

References 16 publications

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“…The issue on the stress interference in the process of multistage hydraulic fracturing has been studied in many papers. − However, quite a few of them were performed through numerical simulations such as the boundary element method , or displacement discontinuity method. , In this article, a novel injection wellbore, with three clusters of perforations welded on it, was manufactured to model horizontal well multistage fracturing in the laboratory. The perforations facilitated the oriented initiation rather than random and uneven fracturing in open sections adopted in some studies .…”

Section: Discussionmentioning

confidence: 99%

Study on the Interference Law of Staged Fracturing Crack Propagation in Horizontal Wells of Tight Reservoirs

Gai

Nie²,

et al. 2020

ACS Omega

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Horizontal well multistage fracturing technology is a high-efficiency method for tight oil and gas production, which increases the contact area between the wellbore and stratum by forming multiple transverse hydraulic fractures (HFs). The stress interference caused by the created HFs will affect the propagation geometries of the subsequent HFs, and then affect the overall fracturing treatment performance. In order to study the distribution of HFs and law of interference among multiple fractures during horizontal well multistage fracturing in tight reservoirs, in this paper, the effects of horizontal stress difference, perforation spacing, and net pressure in the created fracture on the initiation and propagation of multiple cracks were specially studied through large-scale hydraulic fracturing experiments and numerical simulation. The results showed that under high horizontal stress difference, multiple HFs with small spacing tended to coalesce at a place where the length has extended to a certain level. It was also found that the initiation pressures of HFs within subsequent stages increase with the rise of net pressure in created HFs, which causes the subsequent fractures to deviate from the direction perpendicular to the horizontal wellbore and then to gradually deflect toward it. Moreover, the ratio of fracture spacing to fracture height, and the net pressure are the key parameters to determine the deflection degree of HFs for multistage fracturing. In addition, the deflection degree of subsequent HFs was expected to enhance with the decreasing ratio of fracture spacing to fracture height and increasing net pressure in created HFs. It was useful for mitigating stress interference to lengthen the stage spacing, control the fracture height, and reduce the net pressure. The research results have a reference value for the optimal design of the fracture spacing for multistage fracturing.

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Section: Discussionmentioning

confidence: 99%

Study on the Interference Law of Staged Fracturing Crack Propagation in Horizontal Wells of Tight Reservoirs

Gai

Nie²,

et al. 2020

ACS Omega

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“…With this technique, large amounts of fracturing fluid are sequentially injected into different stages to simultaneously initiate multiple perforation clusters within one stage, creating dozens of hydraulic fractures (HFs) along the horizontal segment to maximize access to productive zones (Yew and Weng, 2015). However, monitoring during fracturing has found that the actual stimulated volume is much smaller than that interpreted via microseismic mapping (Xu et al, 2016), implying that considerable areas between two fractures may not be effectively stimulated. Xiong et al (2020) developed the small cluster and stage spacings to further increase the area of fracture surfaces in reservoirs.…”

Section: Introductionmentioning

confidence: 97%

Optimization of volume fracturing technology for shallow bow horizontal well in a tight sandstone oil reservoir

Gao

Cheng²,

Wang³

et al. 2023

Front. Energy Res.

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The physical property of Chang 6 reservoir in Yanchang oilfield is poor, and the heterogeneity is strong. Multistage fracturing of horizontal wells is easy to form only one large horizontal fracture, but it is difficult to control the fracture height and length. The new mining method of “bow horizontal well + multistage horizontal joint” can effectively increase the multistage horizontal joint’s spatial position, which improves the drainage area and stimulation efficiency of oil wells. Due to the reservoir’s low permeability and strong heterogeneity, the single well mode of “bow horizontal well + multistage horizontal fracture” cannot effectively produce Chang 6 reservoir. To improve the production degree of the g 6 reservoir, the fracture model is established using equivalent conductivity and the multigrid method. The pressure response functions of horizontal wells and volume fracturing horizontal wells are established by using the source function, and the relationship between reservoir permeability and starting pressure gradient in the block is calculated. On this basis, the reservoir productivity equation of the block is established, which provides a basis for optimizing the fracturing design parameters of horizontal wells. It is proposed that the flow unit should be considered in the design of fracturing parameters of horizontal fractures, the number of fractures should comprehensively consider whether the fractures can make each flow unit be used, and have large controlled reserves, and the scale of fracturing should comprehensively consider the output and cost. The fracture network model is established by using equivalent conductivity and multi-gridthod, and the volume fracturing design parameters of horizontal wells are optimized, considering the seepage characteristics of the flow unit. The fracturing design parameters of the horizontal section are further defined, which provides a theoretical basis for the efficient development of shallow tight reservoirs.

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“…When fractures are evenly distributed in a three-cluster configuration, the dominant influence resides with the external fractures, prompting the central fractures to propagate linearly. Conversely, if the spacing between the three-cluster fractures varies, the irregularity in the propagation of multiple fractures becomes more prominent (Yun et al 2016). Krzaczek et al (Krzaczek et al 2020) integrated the discrete element method (DEM) with computational fluid dynamics (CFD) to create a numerical model for assessing the response of fluid-induced fractures in rock formations.…”

Section: Introductionmentioning

confidence: 99%

An XFEM-based CZM Numerical Strategy for Modeling Hydraulic Fracture Propagation under Different Fracturing Schemes

Zhang,

Chen,

Wang

2023

J. Phys.: Conf. Ser.

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Segmented and cluster fracturing can improve the efficiency of volume stimulation in shale reservoirs and reduce construction costs. It is important to clarify the propagation characteristics of hydraulic fractures and stress interference under different fracturing techniques to optimize the process of clustered and staged fracturing. For this purpose, we have developed a 2D XFEM-based CZM hydraulic fracturing model. The capability of this model was validated by analytical solutions and then used to study the propagation paths of hydraulic fractures and the characteristics of stress interference under simultaneous fracturing, sequential fracturing, zipper fracturing and multi-cluster fracturing. The results show that in simultaneous fracturing, the middle cluster is compressed by the external position clusters, and the opening width of hydraulic fractures is reduced. In sequential fracturing, the fracture that first initiates create an additional stress field that inhibits the propagation distance of subsequent fractures and the propagation path of hydraulic fractures is also affected in the stress shadow region. Zipper fracturing can effectively alleviate stress interference between multiple fractures, and internal fractures can also propagate a certain distance. In multi-cluster fracturing, the fluid rate into the internal fractures may be limited, and fracture propagation is also limited by stress interference. Therefore, it is necessary to optimize the parameters of clusters to ensure that all clusters can initiate fractures normally. The research results are important for the parameter optimization of clustered and staged fracturing, especially for well factory fracturing mode.

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Stress interference calculation model and its application in volume stimulation of horizontal wells

Cited by 32 publications

References 16 publications

Study on the Interference Law of Staged Fracturing Crack Propagation in Horizontal Wells of Tight Reservoirs

Study on the Interference Law of Staged Fracturing Crack Propagation in Horizontal Wells of Tight Reservoirs

Optimization of volume fracturing technology for shallow bow horizontal well in a tight sandstone oil reservoir

An XFEM-based CZM Numerical Strategy for Modeling Hydraulic Fracture Propagation under Different Fracturing Schemes

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