Stress interference and interaction between two fractures during their propagation: insights from SCDA test and XFEM simulation

Wang, Luchao; Duan, K.; Zhang, Qiangyong; Li, Xuejian; Jiang, Rihua; Yang, Zheng

doi:10.1016/j.ijrmms.2023.105431

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…They considered two fracturing construction schemes: sequential and synchronous fracturing. By comparing the analytical solutions with the numerical experimental results, it demonstrated a strong agreement between the two methods (Wang et al, 2023a). Tang et al addressed the issue of mesh distortion in their work based on DDM.…”

Section: Introductionmentioning

confidence: 89%

Investigation into the dynamic change pattern of the stress field during integral fracturing in deep reservoirs

Lv,

Luo

et al. 2023

Front. Energy Res.

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Deep reservoirs have high temperature, high pressure, and high stress. The development of such resources is high cost. Integral fracturing applies one-time well displacement, batch drilling, and batch fracturing. Multiple wells are stimulated with zipper fracturing. It can avoid the interference of the well drilling and fracturing. In this way, the spatial stresses can be utilized to generate the complex fracture network. The dynamic change pattern of the stress field is of great value for the design of integral fracturing. Based on the displacement discontinuity method (DDM) and the fracture mechanics criteria, a whole fracture propagation program is developed to calculate the spatial stress distribution and the whole fracture geometry. The reliability of the program is verified against the classical analytical solutions. Based on the program, this work systematically investigates the effects of the fracture length, the fracturing sequence, the fracture distribution mode, and the injection pressure on the stress field. The main conclusions are as follows: 1) When the fracture half-length is 150 m and the well spacing is 300 m, the staggered fracture distribution mode can ensure uniform fracture propagation and realize the active utilization of inter-well stress field; 2) Compared with the relative fracture distribution mode, the staggered fracture distribution mode is less susceptible to the stress field induced by the adjacent hydraulic fractures, hydraulic fractures tend to propagate along the direction of the maximum horizontal principal stress; 3) The stress field is highly influenced by the in-fracture fluid pressure. The stress interference is stronger with a greater fluid injection pressure and a higher fracture deflection angle will be obtained. It can enhance the fracture propagation resistance and increase the stress value. This work discovers the stress change pattern and lays out a solid foundation for the optimization of the integral fracturing.

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Section: Introductionmentioning

confidence: 89%

Investigation into the dynamic change pattern of the stress field during integral fracturing in deep reservoirs

Lv,

Luo

et al. 2023

Front. Energy Res.

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“…The latter has the advantage of avoiding the decrease in computational convergence caused by mesh refinement due to stress concentration and the ability to simulate fracture propagation direction changes. However, its computational efficiency is not high, and it cannot form intersecting fractures [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Influencing Three-Dimensional Multi-Cluster Hydraulic Fracturing Considering Interlayer Effect

Zhou,

Liu,

Liang

2024

Applied Sciences

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This study establishes a three-dimensional cohesive model of multi-cluster hydraulic fracturing using finite element method (FEM). It fully considers the interaction between the interlayer and the reservoir and analyzes the key factors influencing fracture propagation. The results show that during the initial stage of hydraulic fracturing, the width of the edge fracture is greater than that of the mid fracture, while the situation is reversed for the fracture length. A larger cluster spacing leads to less interaction between fractures, while a greater number of clusters increases the interaction between fractures. With an increase in displacement, the lost fracturing fluid entering the formation enhances the interaction between fractures. An increase in elastic modulus results in a decrease in the width and height of edge fractures but an increase in their length, with little impact on mid fractures. As Poisson’s ratio increases, there is little change in the fracture morphology of edge fractures, while the width and height of mid fractures increase significantly. With an increase in permeability, the influx of fracturing fluid into the interlayer decreases, leading to a reduction in the interaction between fractures. Finally, the study analyzes and discusses the impact of these parameters on the SRV (stimulated reservoir volume) in both the reservoir and the interlayer. These findings provide new insights for hydraulic fracturing and contribute to improving its productivity.

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“…The stress shadow area is determined based on the minimum size of the fractured surface. Consequently, the effect of stress shadow is dominated by the hydraulic fracture height [63,64]. As shown in Fig.…”

mentioning

confidence: 99%

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

Deng,

Yi,

et al. 2024

Preprint

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Diagnostic technique for hydraulic fracture based on the water-hammer pressure have been gradually highlighted owing to their cost effectiveness and simplicity. The present diagnostic models overlook the effects of fluid leak-off and natural fracture, and it is limited in naturally fractured reservoir. In this study, the location and number of hydraulic fractures are first obtained through the enhancement and cepstrum processing of a water-hammer signal. Subsequently, the water-hammer pressure within the wellbore is calculated by solving the continuity and momentum equations for the fluid. Wellbore and hydraulic fractures are considered as a hydraulic system. To estimate the fracture dimension, flow boundary conditions are imposed to the fluid leak-off, interactions between natural and hydraulic fractures, and multifracture stress shadows. Based on the results, (1) the fracturing shut-in method can be appropriately adjusted to avoid large pressure pulsations, which damage well integrity, and to obtain a clear water-hammer signal for fracture diagnosis. (2) As the perforation cluster spacing increases, the fractures on both sides first decrease and then increase, whereas the centre fracture increases consistently. (3) Natural fractures reduce the hydraulic fracture dimensions but facilitate the creation of complex fracture networks; however, this complexity cannot be increased indefinitely. (4) The minimum horizontal stress decreases the fracture dimension and a greater difference in the horizontal stress renders it easier for hydraulic fractures to cross natural fractures to create larger dimensions. (5) The field study demonstrates the practicality of our model, and optimisation measures can be recommended based on the diagnostic results.

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Stress interference and interaction between two fractures during their propagation: insights from SCDA test and XFEM simulation

Cited by 10 publications

References 38 publications

Investigation into the dynamic change pattern of the stress field during integral fracturing in deep reservoirs

Investigation into the dynamic change pattern of the stress field during integral fracturing in deep reservoirs

Analysis of Factors Influencing Three-Dimensional Multi-Cluster Hydraulic Fracturing Considering Interlayer Effect

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

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