一种功能型滑溜水体系开发及应用

为实现1套压裂工作液体系兼具滑溜水与携砂液双重功能及回用高硬度返排液的目的，开发出1套功能型滑溜水体系。该体系由液态功能型降阻剂及调节剂构成，低浓度的功能型降阻剂水溶液可作为滑溜水使用，15 s内即可快速增稠，滑溜水降阻率高达74%；加入调节剂后体系黏度迅速增加，实现高砂比携砂，返排液回用时不受硬度影响，返排液回配携砂比可达24%。在陇东气开深井现场试验1口井，施工全程回用26 118 mg/L的高矿化度返排液配滑溜水及携砂液，入地总液量654 m3，施工成功。 

Development and Application of a Functional Slick Water

To render fracturing fluid with functions of slick water and sand carrying fluid, and to recycle flowed back fracturing fluid having high salinity, a functional slick water has been developed with liquid functional drag reducer and conditioning agents. A water solution of low concentration functional drag reducer can be used as slick water, the water can be quickly viscosified in 15 secs, and the percent drag reduction of the slick water can be as high as 74%. This slick water, after treated with conditioning agents, will be rapidly viscosified and is able to carry more sands. The slick water flowed back for recycling is not affected by its hardness, and sand carrying capacity of the recycled slick water can be as high as 24%. The slick water has been used on a deep natural gas development well in Longdong, and the recycled slick water with salinity of 26,118 mg/L was used to formulate new slick water; totally 654 m3 of the newly formulated slick water was injected into the reservoir formations.