摘要
针对致密砂岩层作为回注层时水质悬浮物颗粒直径确定难,需采用精细过滤而导致处理站投资成本高、运行维护难的特点,开展了含不同悬浮物颗粒粒径的回注水对致密砂岩岩心的渗透率的伤害模拟实验。加砂压裂后的致密砂岩作为回注层,为减低对回注层的伤害而要求回注水中固体悬浮物粒径小于回注层孔喉直径的观点并不全面,回注水对储层的伤害并非随悬浮物粒径增加而呈线性增加的趋势。结合颗粒架桥理论及紧密堆积理论,并充分考虑人工裂缝的影响,提出了固体悬浮物"不进入基质而堆积在表面、滞留于人工裂缝而不堵塞"的新思路,同时配套形成了致密砂岩回注层固体悬浮物粒径的定量计算方法,确立了优化处理工艺技术,为致密砂岩回注层水处理站建设提供参考,从而利于实现降低投资和便于运行管理的目的。
Since the solid particle size is difficult to determine when the tight sandstone reservoir is regarded as the re-injection layer,and the fine filtration technology will lead to the high investment cost and hard maintenance,so the experiment ofcore permeability damage under the condition of reinjecting water with different solid particle size was carried out. After hydraulic fracturing,it is not comprehensive that the solid particle size should be less than the pore throat diameter during reinjection,the damage of reservoir is not linearly increased with the size of solid particle. Based on the particle bridging and packing theory and considering the effect of artificial fracture,the new conception was proposed that solid particle has not entered matrix but accumulated on the surface,which has stayed in but not blocked the artificial fracture. Besides,the method of calculating solid particle size according to tight sandstone rejection layer was provided and the optimized treatment technology was established,which would guide the reinjection water treatment plant construction and help to reduce the investment and realize effective management.
出处
《钻采工艺》
CAS
北大核心
2014年第6期88-91,6,共4页
Drilling & Production Technology
基金
国土资源部"新场气田国家级绿色矿山建设"支撑项目的研究成果
关键词
致密砂岩
地层水
回注
悬浮物
颗粒粒径
Tight sandstone,formation water,reinjection,suspended matter,particle size
