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.