Proppant Migration in Fracture Fractured with Supercritical CO2 Fracturing Fluid
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摘要: 为了优化超临界CO2压裂工艺技术和施工参数，考虑超临界CO2压裂液中支撑剂颗粒之间相互作用，采用欧拉-拉格朗日方法中的多相质点网格方法，建立超临界CO2压裂缝内支撑剂运移数学模型，通过室内水力压裂支撑剂运移物模实验验证模型准确性，进行超临界CO2压裂缝内支撑剂运移规律计算和分析。研究表明：未增黏CO2由于黏度低，携砂效果极差，优化其他参数对携砂效果影响不大；CO2黏度增加到2.5 mPa·s即可有效提高携砂效果，采用超轻支撑剂与细尺寸颗粒组合，携砂效果与增黏到10 mPa·s效果相差不大；优化支撑剂密度比尺寸对携砂效果提高更为明显；增大排量可以提高携砂效果，但排量继续增大，其携砂效果变化较小；流体滤失对CO2携砂效果影响变化不大。该研究为解决CO2携砂性能差的问题提供了技术支撑，对超临界CO2压裂设计优化及现场施工具有重要指导意义。Abstract: In order to optimize the supercritical CO2 fracturing technology and construction parameters, considering the interaction between proppant particles in supercritical CO2 Fracturing Fluid, the multiphase particle grid method in Euler Lagrange method is used to establish the mathematical model of CO2 fracturing proppant migration. The accuracy of the model is verified by indoor hydraulic fracturing proppant migration model experiment, and the supercritical CO2 fracturing proppant migration law is calculated and analyzed. Research shows: Due to the low viscosity of non tackifying CO2, the sand carrying effect is very poor, and the optimization of other parameters has little effect on the sand carrying effect; When the viscosity of CO2 increases to 2.5 mPa·s, the sand carrying effect can be effectively improved. The combination of ultra-light proppant and fine particles has little difference between the sand carrying effect and the viscosity increasing to 10 mPa·s; Optimizing the density ratio of proppant to size can improve the sand carrying effect more obviously; Increasing the displacement can improve the sand carrying effect, but if the displacement continues to increase, the sand carrying effect changes little; Fluid filtration has little effect on CO2 sand-carrying effect. This study provides technical support for solving the problem of poor sand carrying performance of CO2, and has important guiding significance for supercritical CO2 fracturing design optimization and field construction.
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Key words:
- Supercritical carbon dioxide /
- Fracturing /
- Fracture /
- Proppant /
- Migration
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