Experiments and analysis on the influence of multiple closed cemented natural fractures on hydraulic fracture propagation in a tight sandstone reservoir

Zhang, Jun; Li, Yuwei; Pan, Yishan; Wang, Xiangyang; Yan, Maosen; Shi, Xiaodong; Zhou, Xiaojin; Li, Huili

doi:10.1016/j.enggeo.2020.105981

Cited by 87 publications

(22 citation statements)

References 54 publications

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“…The types of hydraulic fractures generated by staged fracturing vary from simple to complex, as shown in Figure 2. They are simple fractures, complex fractures, and fracture clusters (Fisher et al, 2004), among which the fracture cluster model is more consistent with the distribution of fracture network in the formation after hydraulic fracturing (Li et al, 2017;Li et al, 2018;Xie et al, 2020;Zhang et al, 2021a;Zhang et al, 2021b).…”

Section: Numerical Simulation Modelmentioning

confidence: 60%

Parameter Optimization of Segmental Multicluster Fractured Horizontal Wells in Extremely Rich Gas Condensate Shale Reservoirs

Wei¹,

Wang²,

Rumin³

et al. 2021

Front. Earth Sci.

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For economic and efficient development of extremely high-condensate shale gas reservoirs, a numerical model of segmental multicluster fractured horizontal well was established considering the effect of condensate and desorption, and the optimization of fracturing segments, fracturing clusters, half-length of main fracture, fracture permeability, fracture mesh density, and fracture distribution patterns were studied. It is indicated that the horizontal well whose design length is 2,700 m performs best when it has 43 fracturing segments with three clusters in each segment and the fracture permeability is 300 mD. The production capacity of horizontal wells is positively linearly correlated with the half-length of fractures. Increasing fracture half-length would be an effective way to produce condensate oil near wellbore. An effective fractured area can be constructed to remarkably improve productivity when the half-length of the fracture is 50 m and the number of secondary fractures is four in each segment. On the basis of reasonable fracture parameters, the staggered type distribution pattern is beneficial to the efficient development of shale gas-condensate reservoirs because of its large reconstruction volume, far pressure wave, small fracture interference, and small precipitation range of condensate.

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Section: Numerical Simulation Modelmentioning

confidence: 60%

Parameter Optimization of Segmental Multicluster Fractured Horizontal Wells in Extremely Rich Gas Condensate Shale Reservoirs

Wei¹,

Wang²,

Rumin³

et al. 2021

Front. Earth Sci.

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“…The mechanical stratigraphy controlled the fracture nucleation, propagation, and geometry [41][42][43][44][45]. Fractures usually initiated (nucleate) in relatively brittle formations and terminated at the interface between brittle and ductile formations [46]. Fracture spacing statistics in the outcrops confirm that the fracture spacing and fracture density are correlated with the mechanical layer thickness (Figure 4).…”

Section: Geofluidsmentioning

confidence: 82%

Quantitative Prediction of Natural Fractures in Shale Oil Reservoirs

et al. 2021

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Natural fractures are the key factors controlling the enrichment of shale oil. It is of great significance to clarify the distribution of natural fractures to guide the selection of sweet spots for shale oil. Taking the Qing-1 Member shale oil reservoir in the northern Songliao Basin, China as an example, a new method considering the factors affecting fracture distribution was proposed to quantitatively predict the structural fractures. And the effect of natural fractures on shale oil enrichment was discussed. Firstly, the types and characteristics of fractures in shale oil reservoirs are characterized by using core and outcrop data. Combined with the experimental analysis, the influences of fault, mechanical stratigraphy, mineral composition and content, TOC, and overpressure on fracture intensity were clarified. Then, the number and density of fractures are quantitatively predicted according to the power-law distribution of fault length. Next, geomechanical simulation and fracture prediction were carried out on the model which was established with comprehensive consideration of the influencing factors of fracture distribution. Finally, the fracture distribution is evaluated comprehensively based on above prediction. The prediction results in this work are consistent with the core measurements.

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“…Deformation of the formation will occur because of CO 2 injection. Considering the existence of shale the bedding plane, natural fractures, and faults [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53], the deformation behavior and the effect on fluid transport will be extremely complicated. The reactivation potential of faults does exist, Lithosphere which may provide a leak path for CO 2 to escape the storage formation [54][55][56].…”

Section: Discussionmentioning

confidence: 99%

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

Yan

et al. 2021

Lithosphere

Self Cite

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Recently, CO2 geological sequestration combined with enhancing deep saline water/brine recovery is regarded as a potential strategic choice for reduction of CO2 emissions. This technology not only achieves the relatively secure storage of CO2 which was captured during industrial processes but also can enhance the recovery of water for drinking, industrial, and agricultural utilization. However, the impact of CO2-water-rock reactions on the shale reservoir in the system is unclear and the sealing performance of mudstone caprock has not been investigated. For analyzing the mechanism of mineral alteration in the shale reservoir, a three-dimensional injection-production model in the double-fractured horizontal well pattern is established according to actual parameters of shale and mudstone layers. In addition, mineral alteration was characterized and caprock sealing performance was also assessed. Numerical results showed that the presence of CO2 can lead to the dissolution of k-feldspar, oligoclase, chlorite, and dolomite and the precipitation of clay minerals such as kaolinite, illite, and smectite (Ca-smectite and Na-smectite). Due to positive ion released by dissolved primary minerals, the precipitation of secondary carbonate occurs including ankerite and dawsonite, which induces the mineral sequestration capacity of the shale reservoir. The amount of CO2 sequestration by mineral is 51430.96 t after 200 years, which equals 23.47% of the total injection (219145.34 t). Besides, the height of the sealing gas column is used for evaluating the sealing performance of the shale-mudstone interface. Results show that the height of the sealing gas column at the interface above the injection well is lower but the maximum value of CO2 gas saturation is only 0.00037 after 200 years. The height of the sealing gas column at the interface is greater than 800 m, which can be classified as level II and guarantee the security of the CO2 storage. The analysis results provide reliable guidance and reference for the site selection of CO2 geological sequestration.

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Experiments and analysis on the influence of multiple closed cemented natural fractures on hydraulic fracture propagation in a tight sandstone reservoir

Cited by 87 publications

References 54 publications

Parameter Optimization of Segmental Multicluster Fractured Horizontal Wells in Extremely Rich Gas Condensate Shale Reservoirs

Parameter Optimization of Segmental Multicluster Fractured Horizontal Wells in Extremely Rich Gas Condensate Shale Reservoirs

Quantitative Prediction of Natural Fractures in Shale Oil Reservoirs

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

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