Simulation of fracture propagation and optimization of ball-sealer in-stage diversion under the effect of heterogeneous stress field

Zhou, Taofa; Chen, Ming; Zhang, Shicheng; Li, Yuanzhao; Li, Fengxia; Zhang, Chi

doi:10.1016/j.ngib.2020.09.010

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…Recently, numerous researchers have delved into fracture propagation patterns in TPSF. Numeric simulation techniques, including the finite-element method (FEM), extended finite-element method (XFEM), boundary element method (BEM), displacement discontinuity method, and discrete element method (DEM), are important tools for assessing both the size of fractures and the effectiveness of fracturing performance. − Using the BEM, Zhou et al developed a temporary plugging model to simulate the fracture propagation and diversion in horizontal wells, in which the effect of induced stress and initial stress field were taken into consideration. Wang et al established an XFEM model to investigate the refracture morphology during near-wellbore temporary plugging refracturing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fracture Propagation during Temporary Plugging Staged Fracturing in Tight-Oil Horizontal Wells

Li,

Zhu,

Hua

et al. 2024

ACS Omega

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Fracture propagation with temporary plugging hydraulic fracturing in tight-oil reservoirs is simulated in this study. The research considers dynamic fluid redistribution, with stress differences among multiple fractures. The fracture morphology during temporary plugging staged fracturing (TPSF) is investigated by using a user-defined perforation element combined with a pore-pressure finite-element model. The precision of the integrated model is verified by using the standard finite-element approach. Then, case studies are presented to investigate the influence of cluster spacing, horizontal stress difference coefficients (SDC), injection rates, and barrier tensile strengths. The simulation results show that central cluster fractures are hampered by side-cluster fractures, while TPSF can alleviate the effect and lead to a more uniform propagation of all fractures. Stress interference weakens as cluster spacing increases, and propagation patterns are minimally influenced once spacing reaches 40 m. Higher injection rates can improve the injection pressure, enlarging fracture width, and potentially increasing the risk of fracture penetration. Barrier tensile strength and horizontal SDC can modify fracture geometries and determine the penetration behavior of multiple fractures.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fracture Propagation during Temporary Plugging Staged Fracturing in Tight-Oil Horizontal Wells

Li,

Zhu,

Hua

et al. 2024

ACS Omega

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“…Therefore, the effect of stress shadow should be weakened, or the increased resistance caused by stress shadow should be balanced, to promote a uniform flow distribution between fractures. Quite a few technologies have been proposed to promote uniform fracture propagation, such as limited-entry fracturing, temporary plugging fracturing, and fracture optimization [19][20][21]. Wu et al [22] investigated multi-fracture propagation and found that reducing the perforation number and adjusting non-uniform cluster spacing could effectively improve the unevenness of the fracture propagation using the displacement discontinuity method (DDM).…”

Section: Introductionmentioning

confidence: 99%

Multi-Fracture Propagation Considering Perforation Erosion with Respect to Multi-Stage Fracturing in Shale Reservoirs

Tan,

Xie,

et al. 2024

Energies

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Shale gas is considered a crucial global energy source. Hydraulic fracturing with multiple fractures in horizontal wells has been a crucial method for stimulating shale gas. During multi-stage fracturing, the fracture propagation is non-uniform, and fractures cannot be induced in some clusters due to the influence of stress shadow. To improve the multi-fracture propagation performance, technologies such as limited-entry fracturing are employed. However, perforation erosion limits the effect of the application of these technologies. In this paper, a two-dimensional numerical model that considers perforation erosion is established based on the finite element method. Then, the multi-fracture propagation, taking into account the impact of perforation erosion, is studied under different parameters. The results suggest that perforation erosion leads to a reduction in the perforation friction and exacerbates the uneven propagation of the fractures. The effects of erosion on multi-fracture propagation are heightened with a small perforation diameter and perforation number. However, reducing the perforation number and perforation diameter remains an effective method for promoting uniform fracture propagation. As the cluster spacing is increased, the effects of erosion on multi-fracture propagation are aggravated because of the weakened stress shadow effect. Furthermore, for a given volume of fracturing fluid, although a higher injection rate is associated with a shorter injection time, the effects of erosion on the multi-fracture propagation are more severe at a high injection rate.

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“…A continuous decline in conventional oil reserves has led to increasing attention to unconventional oil resources (Awan et al, 2021), especially shale oil, due to its vast number of resources and considerable production rate after fracturing (Zhou et al, 2020a;Zhou et al, 2020b). The output of shale oil in the United States has reached 60% of the total output of crude oil (Dong et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Oil Occurrence States in Shale Mixed Inorganic Matter Nanopores

et al. 2022

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In present paper, the mineral and fluid compositions of shale oil from the Songliao Basin are analyzed systematically using core samples, X-ray diffractometer (XRD), and gas chromatography (GC). The effects of shale mineral composition, pore size, temperature, and pressure on the mass density of the adsorbed layers are then studied utilizing molecular dynamics simulation. The results show that illite and quartz are predominant in the micro petrological components of the shale, and nC19 is the main carbon peak. The fluid consists primarily of n-alkane molecules, and nC19 is found to be representative of the shale oil composition. Moreover, the adsorbing effect of quartz-illite mixed wall is between that of a pure mineral wall (illite and quartz), indicating that the selection of a mixed wall is similar to the actual shale composition. If the pores are inorganic, the minimum pore size of only adsorption oil is smaller than the organic pores. The critical adsorption point of shale oil in inorganic pores is less than 3.2 nm. Furthermore, compared to pressure, the temperature has a more significant effect on fluid adsorption due to the correlation with the kinetic energy of alkane molecules. This research shows the oil occurrence status in inorganic matter nanopore with a mixed solid wall, and provides theoretical support for shale oil exploration.

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Simulation of fracture propagation and optimization of ball-sealer in-stage diversion under the effect of heterogeneous stress field

Cited by 8 publications

References 9 publications

Numerical Simulation of Fracture Propagation during Temporary Plugging Staged Fracturing in Tight-Oil Horizontal Wells

Numerical Simulation of Fracture Propagation during Temporary Plugging Staged Fracturing in Tight-Oil Horizontal Wells

Multi-Fracture Propagation Considering Perforation Erosion with Respect to Multi-Stage Fracturing in Shale Reservoirs

Oil Occurrence States in Shale Mixed Inorganic Matter Nanopores

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