Flow field simulation of supercritical carbon dioxide jet: Comparison and sensitivity analysis*

Wang, Haizhu; Li, Gensheng; Tian, Shouceng; Cheng, Yuxiong; He, Zhen-guo; Yu, Shui-jie

doi:10.1016/s1001-6058(15)60474-7

Cited by 31 publications

(9 citation statements)

References 7 publications

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“…Obviously, force applied against intermolecular attraction is equal to the increase in potential energy. The sum of molecular attraction on both sides of the section for 1 mol of the Van der Waals gas is a/v 2 , and the force against it for 1 mol of Van der Waals gas is shown in Equation (15),…”

Section: ) Sc-comentioning

confidence: 99%

Numerical Investigation of Rock Breaking Mechanism With Supercritical Carbon Dioxide Jet by SPH-FEM Approach

Yang

2019

IEEE Access

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As a novel technology in the field of petroleum exploitation, rock breaking with supercritical carbon dioxide (SC-CO 2 ) has considerable social and economic benefits. To investigate the rock breaking mechanism under SC-CO 2 jet impacting in terms of mass and energy conservation, a fluid-solid coupling numerical model was established using smoothed particle hydrodynamics (SPH) method coupled with the finite element method (FEM). Jet movement feature and the stress distribution rule of impact target were obtained. Moreover, the space-time evolution of erosion cavity and failure process of elements were analyzed. The numerical research results are as follows: (1) the hybrid algorithm of SPH-FEM was effective for obtaining the numerical representation of rock breaking process under SC-CO 2 jet impacting, and the simulation results were in good agreement with the experimental data. (2) The asymmetrical distribution characteristics of monitored points caused the erosion cavity to deviate from the geometrical center of the target face. (3) Soft rock under SC-CO 2 jet impacting presented two failure forms: erosion and exfoliation. (4) The process of rock breaking with SC-CO 2 jet was as follows: when the jet came into contact with the target plane, the pressure stress on the mating face and shear stress on the contact edge dominated the evolution of initial compression-shear failure zone. Thereafter, the high diffusivity-driven SC-CO 2 penetrated into tiny cracks or pores near the failure zone, and strong air wedge effect caused tensile failure. With continuous high-speed impacting, the initial failure zone extended to a larger primary failure zone. Moreover, a few discrete failure zones were formed due to the high uncertainties of particles' motion trajectories, which mutually contributed to the main failure zone, and the erosion cavity was formed. When the jet became steady, quasi-static action was applied to the rock sample, and the erosion range expanded continuously.INDEX TERMS Jet impingement, numerical representation, rock fragmentation, supercritical carbon dioxide.

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Section: ) Sc-comentioning

confidence: 99%

Numerical Investigation of Rock Breaking Mechanism With Supercritical Carbon Dioxide Jet by SPH-FEM Approach

Yang

2019

IEEE Access

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“…Kim and Toshio (1992) were the first to simulate the heat transfer of a laminar sc-CO 2 impinging jet. Wang et al. (2015) simulated the flow field of an sc-CO 2 jet using computational fluid dynamics (CFD) and found that sc-CO 2 jets can produce higher velocities and pressures than water jets under the same conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic simulation of the oscillation characteristics of supercritical carbon dioxide impacting jets

Zhang

Tang

et al. 2018

Journal of Vibration and Control

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A numerical model was established to investigate the dynamic oscillation characteristics of supercritical carbon dioxide (sc-CO2) impacting jets. The jet hydrodynamics, heat transfer, and physical properties of sc-CO2 fluid were incorporated into the model. The coupling of multiple fields with large velocity and pressure gradients was achieved using a modified SIMPLE segmentation algorithm. Laboratory experiments validated the reliability of the numerical model by detecting dynamic changes in the pressure on the centerline of the sc-CO2 impacting jet. Analysis of the flow field showed single or double high-speed sc-CO2 mass structures for the sc-CO2 impacting jet, revealing the generation mechanism of the impacting oscillation frequency and the mechanism of improved rock-breaking efficiency by sc-CO2 jet. The oscillation frequency equation was obtained through a quantitative treatment of the velocity and motion area of the sc-CO2 mass. Finally, the equation and simulation results were used to analyze the influences of the target distance, inlet pressure and temperature on the sc-CO2 jet oscillation characteristics. The results showed that the oscillation frequency and amplitude first increased and then decreased with increases in the target distance. The oscillation frequency and amplitude both increased with increasing inlet pressure; the oscillation frequency increased slowly with increasing temperature.

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“…5 He et al investigated the pressurization effect during supercritical CO 2 jet fracturing and studied the properties and parametric influences of the supercritical CO 2 jet; their work demonstrated that supercritical CO 2 jetting has a higher impact pressure and velocity than a water jet under the same conditions. 6,7 Jiang et al studied the mechanism of shale microstructure change via supercritical CO 2 treatment and found that supercritical CO 2 can extract more organic matter from the pores and fractures in shale, increasing the number of shale gas seepage channels and enhancing connectivity. 8 Skurtveit et al investigated the basic mechanisms involved in the CO 2 breakthrough process.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the effect of natural microcracks on the supercritical CO₂ fracturing crack network of shale rock based on bonded particle models

Peng

Wang

et al. 2017

Num Anal Meth Geomechanics

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Summary The problem of predicting the geometric structure of induced fractures is highly complex and significant in the fracturing stimulation of rock reservoirs. In the traditional continuous fracturing models, the mechanical properties of reservoir rock are input as macroscopic quantities. These models neglect the microcracks and discontinuous characteristics of rock, which are important factors influencing the geometric structure of the induced fractures. In this paper, we simulate supercritical CO2 fracturing based on the bonded particle model to investigate the effect of original natural microcracks on the induced‐fracture network distribution. The microcracks are simulated explicitly as broken bonds that form and coalesce into macroscopic fractures in the supercritical CO2 fracturing process. A calculation method for the distribution uniformity index (DUI) is proposed. The influence of the total number and DUI of initial microcracks on the mechanical properties of the rock sample is studied. The DUI of the induced fractures of supercritical CO2 fracturing and hydraulic fracturing for different DUIs of initial microcracks are compared, holding other conditions constant. The sensitivity of the DUI of the induced fractures to that of initial natural microcracks under different horizontal stress ratios is also probed. The numerical results indicate that the distribution of induced fractures of supercritical CO2 fracturing is more uniform than that of common hydraulic fracturing when the horizontal stress ratio is small.

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Flow field simulation of supercritical carbon dioxide jet: Comparison and sensitivity analysis*

Cited by 31 publications

References 7 publications

Numerical Investigation of Rock Breaking Mechanism With Supercritical Carbon Dioxide Jet by SPH-FEM Approach

Numerical Investigation of Rock Breaking Mechanism With Supercritical Carbon Dioxide Jet by SPH-FEM Approach

Dynamic simulation of the oscillation characteristics of supercritical carbon dioxide impacting jets

Numerical analysis of the effect of natural microcracks on the supercritical CO₂ fracturing crack network of shale rock based on bonded particle models

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Flow field simulation of supercritical carbon dioxide jet: Comparison and sensitivity analysis*

Cited by 31 publications

References 7 publications

Numerical Investigation of Rock Breaking Mechanism With Supercritical Carbon Dioxide Jet by SPH-FEM Approach

Numerical Investigation of Rock Breaking Mechanism With Supercritical Carbon Dioxide Jet by SPH-FEM Approach

Dynamic simulation of the oscillation characteristics of supercritical carbon dioxide impacting jets

Numerical analysis of the effect of natural microcracks on the supercritical CO2 fracturing crack network of shale rock based on bonded particle models

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Numerical analysis of the effect of natural microcracks on the supercritical CO₂ fracturing crack network of shale rock based on bonded particle models