The integrated viscosity- variable acid system, having properties of ‘multi-functions’ and ‘viscosity varying in  three dimensions’, can achieve transformations among acidic slippery water, low viscosity, gelled acid, high viscosity acid functions. The variable viscosity time can be adjusted from 2-8 minutes and the viscosity can be adjusted from 3-255 mPa · s, which completely meet the needs of deep acid fracturing stimulation for 180 ℃ carbonate rock reservoirs.

①Acidizing and acid pressing of carbonate reservoir；

②80-180℃ reservoir；

③Open hole and casing completions；

④Gas and oil Wells；

Advantage

①Compared with conventional acid pressing, acid etching cracks have deeper penetration distance and higher conductivity

②The process of immediate matching and injection saves the construction period

③One kind of system can realize the integration of acid slippery water, low viscosity, medium viscosity and high viscosity into viscoacid

④Reservoir damage is small

Performance

①Acid slippery water, low viscosity acid, gelling acid and crosslinked acid “four liquids in one”

②Slow 95% to achieve deep penetration

③The variable viscosity non-uniform etching is strong, and the conductivity of the conventional acid is increased by 50%

④Broken adhesive viscosity < 3mPa.s, the reservoir damage is small

⑤That is, with the injection, online change sticky acid, construction is simpler