支撑剂在超临界CO2压裂液流化床中的运动研究

摘要/Abstract

摘要：

已知超临界CO₂兼有气体和液体双重特性,为研究井筒中砂粒在超临界CO₂压裂液形成的流化床中的受力以及在力的作用下支撑剂颗粒运移方式,对颗粒与颗粒,颗粒与流体之间的作用力以及流体对颗粒的作用力等进行分析。通过数学模型推导出弹性恢复系数与颗粒聚团浓度的关系,随着弹性恢复系数的增大,颗粒聚团浓度分布越均匀;颗粒聚团浓度变小,颗粒聚团碰撞越剧烈;颗粒沉降越慢,压裂液携砂效果越好。并通过对基于颗粒动力学理论的欧拉—欧拉多相流模型进行数值模拟,来描述颗粒在施工条件下超临界CO₂压裂液的流化床内的流化模型及超临界相与固相颗粒两相分布状态,模拟结果与数学模型一致。

关键词: 支撑剂, 颗粒聚团, 弹性恢复系数, 双欧拉模型, 颗粒沉降

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

中图分类号:

TE357

陈艳秋. 支撑剂在超临界CO₂压裂液流化床中的运动研究[J]. 油气藏评价与开发, 2018, 8(3): 55-60.

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

图/表 5

表1

材料参数选取"

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

表1

图1

图2

图3

图4

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支撑剂在超临界CO₂压裂液流化床中的运动研究

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

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