国内变黏滑溜水研究进展及在川渝非常规气藏的应用.

This paper summarizes the latest progress of variable viscosity slick water technology in China, analyzes the application of variable viscosity slick water in unconventional gas reservoirs in Sichuan and Chongqing, and puts forward the development direction of variable viscosity slick water. The variable viscosity slick water realizes the real-time switching of low, medium and high viscosity liquids by adjusting the concentration of drag reducer and / or introducing cross-linking agent. The research of drag reducer focuses on the synthesis and performance evaluation of polyacrylamide containing AMPS or SSS salt-tolerant groups and hydrophobic associating polymer, to meet the needs of preparing fracturing flow-back fluid mixing and change viscosity. The research on the performance of variable viscosity slick water mainly focuses on the influence law of viscosity on sand carrying performance, fracture morphology and drag reduction performance, but it is not yet determined what viscosity is suitable for what reservoir. The application of variable viscosity slick water in unconventional gas reservoirs in Sichuan and Chongqing was successful. The overall viscosity in tight gas is higher than that in shale gas, and the sand carrying capacity in deep shale gas needs to be further enhanced. Hydrophobically associating polymer drag reducer and solid drag reducer are the development direction of variable viscosity slick water. It is expected to solve the problems of high frictional resistance of high viscosity liquid and potential environmental risks of emulsion drag reducer. This paper has certain guiding significance for the research and application of variable viscosity slick water. [ABSTRACT FROM AUTHOR]