Research and Performance Analysis of 245 ℃ Ultra-high Temperature Fracturing Liquid

Abstract

AbstractHydraulic fracturing is a key technology in the global revolution in unconventional reservoirs. Fracturing fluid plays an important role in hydraulic fracturing in the artificial transformation of shale reservoirs to increase seepage channels. With the different depth of fracturing fluid entering the underground reservoir, the temperature gradient also changes dramatically, and it is necessary to use cross-linking ritorifient thermodynamics to analyze the effect of temperature on the gentle non-isometric cross-linking process such as fracturing fluid system. For the first time, micro-rheometers were used to study the high temperature polymer fracturing fluid system and simulate its static crosslinking process in underground reservoirs.Aiming at the preparation of high temperature thickener and temperature-resistant fracturing fluid with excellent performance, the new AM/DMAM/AMPS/AA/NVP five-element polymer fracturing fluid system with temperature resistance of 245 ℃ was prepared, and the effect of monomer concentration, polymer pH, trigger usage and polymerization temperature on the properties of the gel after reaction was examined, and the polymer structure was analyzed by infrared spectroscopic analysis of the polymer structure. The results showed that: through a single-factor analysis of polymerization conditions, it was determined that the synthesis conditions of AM/DMAM/AMPS/AA/NVP five-element polymer thickener were: the concentration of polymeric monomer aqueous solution was 30 wt, the polymerization pH was between 7 and 8, the polymerpedization pH was 8, the trigger (NH4) 2S2O8 and NaHSO4 ratio was 1:1, and the trigger was triggered The total mass of the monomer is 0.2 wt, the polymeric suitable temperature is between 10 ℃ and 20 ℃, the compound has been proved to have a typical five-unit polymerization characteristic peak, which is consistent with the designed molecular structure, and the temperature-resistant shear curve proves that the five-element polymer is suitable for use as a thickener of the ultra-high temperature fracturing liquid system of 245 ℃.KeywordsPolymersHigh-temperature fracturing fluidsRheological and stimulation