致密气藏水力压裂支撑剂运移影响因素数值模拟
Numerical simulation of factors affecting the migration of hydraulic fracturing proppants in tight gas reservoirs
田鸿照 1刘湘子 2陈宗利 3史小军 3李民 3苑秀发3
作者信息
- 1. 中国石油长城钻探地质研究院,辽宁盘锦 124010
- 2. 中国石油辽河油田兴隆台采油厂机动采油大队,辽宁盘锦 124010
- 3. 中国石油长城钻探压裂公司,辽宁盘锦 124010
- 折叠
摘要
致密气藏水力压裂裂缝中支撑剂的铺置形态直接影响裂缝的导流能力,进而影响压后产能.基于欧拉-欧拉方法,建立了CFD流体动力学数值模拟模型,分析了排量、砂比、支撑剂粒径和密度、组合加砂因素对支撑剂运移规律和铺置特征的影响.结果表明,在胍胶压裂液体系中,排量大于 3.5 m3/min、砂比高于 25%后,支撑剂充填高度增长不明显;支撑剂密度对缝内支撑剂分布的影响较小;建议使用较小粒径的支撑剂,同时在组合加砂中适当提高小粒径支撑剂的加砂量,有利于裂缝中砂堤高度均匀,从而形成较大的铺砂面积.研究结果优化了压裂施工参数,为水力压裂加砂设计提供了重要指导.
Abstract
The placement of proppants in hydraulic fracturing fractures of tight gas reser-voirs directly affects the conductivity of the fractures,which in turn affects the post fractur-ing productivity.Based on the Euler-Euler method,a CFD fluid dynamics numerical simu-lation model was established to analyze the effects of displacement,sand ratio,proppant par-ticle size and density,and combined sand addition factors on the transport law and place-ment characteristics of proppants.The results showed that in the guanidine gum fracturing fluid system,the increase in proppant filling height was not significant when the displace-ment was greater than 3.5 m3/min and the sand ratio was higher than 25%.The effect of proppant density on the distribution of proppants within the seam is relatively small.It is recommended to use smaller particle size proppants and increase the amount of sand added to the combination sand,which is beneficial for the uniform height of the sand embankment in the cracks,thus forming a larger sand laying area.The research results optimized the fracturing construction parameters and provided important guidance for the design of hy-draulic fracturing sand addition.
关键词
水力压裂/支撑剂运移/影响因素/数值模拟Key words
hydraulic fracturing/proppant transport/influencing factors/numerical simulation引用本文复制引用
基金项目
中国石油长城钻探工程有限公司科技专项(GWDC2024-01-AJC-08)
出版年
2024
NETL
NSTL
万方数据