Integrated optimization of fracture parameters for subdivision cutting fractured horizontal wells in shale oil reservoirs

Deng, Hong‐Wen; Sheng, Guanglong; Zhao, Hui; Meng, Fankun; Zhang, Haoyi; Ma, Jinxing; Gong, Jie; Ruan, Jiayu

doi:10.1016/j.petrol.2022.110205

Cited by 31 publications

(14 citation statements)

References 16 publications

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“…When the Knudsen number is between 0.001 and 0.1, the gas nanopore transmission mechanism is slippage flow, the collision frequency between gas molecules and wall increases gradually, and the nonslippage condition breaks down. Then, it is found that satisfactory results can be obtained by modifying the slip boundary conditions [36][37][38][39][40][41][42][43][44][45][46].…”

Section: Nanoconfined Bulk-gas Flowmentioning

confidence: 99%

Effect of Pore Geometry on Nanoconfined Bulk-Gas Flow Behavior

Zhang

2022

Geofluids

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In order to improve energy consumption structure in Guizhou province, China, the efficient development of shale gas becomes more and more important. However, the theoretical understanding, towards microscopic gas flow mechanism, is still weak and insufficient. Although many models have been established, one part of them fails to cover all flow mechanisms, and the other part contains several fitting parameters. Moreover, nanopores can be divided into circular pore and slit pore in accordance with pore geometry. For cylindrical nanopores, by fully comparing with the existed models, a new bulk-gas transport model is proposed by weight superposition of slip flow and Knudsen diffusion, in which weight factors are obtained by Wu’s model and Knudsen’s model, respectively. For slit pores, an analytical equation for bulk-gas flow is proposed as well, which is free of any fitting parameters. The reliability of the proposed models has been clarified. The impacts of reservoir pressure, pore scale, and gas flow mechanism on bulk-gas flow behavior in process of shale gas development are analyzed. It is found that gas transport capacity of slit nanopores is significantly higher than that of cylindrical nanopores at the same pore scale. For slit nanopores, the larger the aspect ratio, the stronger bulk-gas transmission capacity. As the established models are free of fitting parameters and can be applied into the entire K n range with sufficient accuracy, the research will greatly benefit shale gas development.

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Section: Nanoconfined Bulk-gas Flowmentioning

confidence: 99%

Effect of Pore Geometry on Nanoconfined Bulk-Gas Flow Behavior

Zhang

2022

Geofluids

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“…Supercritical CO 2 can reduce the rupture pressure of rocks. Since supercritical CO 2 has good diffusion and permeability, supercritical CO 2 fracturing reduces the effective stress of surrounding rock by increasing pore pressure, which makes the initiation pressure lower than hydraulic fracturing (Tudor et al, 1994;Ito, 2008;Zou et al, 2018;Deng et al, 2022), as shown in Figure 1C. Ding et al (2018) analyzed the fracturing mechanism of supercritical CO 2 fracturing based on the rock fracture criterion of linear elastic model.…”

Section: Reducing Initiation Pressurementioning

confidence: 99%

Analysis of the influence of CO2 pre-injection during hydraulic fracturing on enhanced oil recovery in shale reservoirs

et al. 2022

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“…Mineral joint fractures are resulted from the breaking of mineral joints (mica, feldspar, etc.) along the joint surface after the release of compressive stress or differential compaction [22]. Joint fractures in Mica, feldspar, and certain fibrous mineral or sheet microfractures are typically observed (Figure 5(a)).…”

Section: Reservoir Types and Featuresmentioning

confidence: 99%

Storage Properties of the Shale Reservoir of the Lower Keluke Formation in the Shihuigou Area: Implications for the Controlling Factors

Zhang

2022

Geofluids

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In this study, the characteristics of shale gas reservoirs of the lower part of the Keluke Formation in the Shihuigou area were investigated by using thin sections, scanning electron microscopy (SEM), and isothermal adsorption, combined with geochemical experimental analysis. Consequently, the controlling factors of the adsorption capability and gas content of the studied shale reservoir are explored. The results show that the shale reservoir space of the Keluke Formation is dominated by pores and fractures. The pores are divided into intergranular pores, intragranular pores, and dissolved pores. The pore volume of medium pores is higher than that of micropores, but the specific surface area of the medium pores is lower than that of micropores. The pore size distribution of medium pores has a feature of single peak, while the distribution of micropores is multipeaked. The results of physical properties and field gas adsorption indicate that the reservoir quality and gas content of the lower part of the Keluke Formation are good. Meanwhile, the total organic content (TOC) has a positive relationship with the methane adsorption. However, the field gas adsorption does not have a clear relationship with TOC and methane adsorption, but a positive correlation with clay mineral content. Therefore, the present study concludes that the natural gas in the shale reservoir of the lower part of the Keluke Formation is predominantly accumulated in form of free gas, and the concentration of free gas is higher than that of the adsorbed gas.

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Integrated optimization of fracture parameters for subdivision cutting fractured horizontal wells in shale oil reservoirs

Cited by 31 publications

References 16 publications

Effect of Pore Geometry on Nanoconfined Bulk-Gas Flow Behavior

Effect of Pore Geometry on Nanoconfined Bulk-Gas Flow Behavior

Analysis of the influence of CO2 pre-injection during hydraulic fracturing on enhanced oil recovery in shale reservoirs

Storage Properties of the Shale Reservoir of the Lower Keluke Formation in the Shihuigou Area: Implications for the Controlling Factors

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