支撑剂在超临界CO2压裂液流化床中的运动研究

Abstract

Abstract:

It is well known that the supercritical CO₂ has the dual characteristic of gas and liquid. In order to study the forces of the sand in the fluidized bed formed by the supercritical CO₂ fracturing fluid and the migration of the proppant particle under the force, we analyzed the acting force between two particles, and the particle and the fluid, and that of the fluid on the particle. Based on the mathematical model, we derived the relation between the elastic restitution coefficient and the agglomeration concentration of particles. With the increasing of the elastic restitution coefficient, the distribution of the agglomeration concentration gets more evenly, the agglomeration concentration decreases, the collision of particles is more intense, the particles settle down more slowly, and the sand migration effect is better. Meanwhile, through the numerical simulation of the double Euler multiphase model based on the particle kinetic theory, we described the fluidization model in the fluidized bed formed by the supercritical CO₂ fracturing fluid in operation, and the two phase distribution of the particle of the supercritical phase and the solid phase. The simulation result is consistent with the mathematical model.

Key words: proppant, agglomeration of particle, elastic restitution coefficient, double Euler model, granular settlement

CLC Number:

TE357

Chen Yanqiu. Study on movement of granules in the fluid bed of supercritical CO₂ fracturing fluid[J].Reservoir Evaluation and Development, 2018, 8(3): 55-60.

Figures/Tables 5

Table 1

Material parameters"

物料	比热容/（ $K ? g - 1 ?$ ℃）	密度/（ $kg ? m - 3$ ）	导热系数/（ $w ? c m - 1 ? K$ ）	黏度/（ $mPa ? s$ ）
超临界CO₂	0.9	300	0.02	0.068
砂粒（SiO₂）	0.23	220	0.27	1.2

Table 1

Fig. 1

Fig. 2

Fig. 3

Fig. 4

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Study on movement of granules in the fluid bed of supercritical CO₂ fracturing fluid

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Study on movement of granules in the fluid bed of supercritical CO2 fracturing fluid

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Study on movement of granules in the fluid bed of supercritical CO₂ fracturing fluid