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合成一种非离子表面活性剂脂肪酰胺丙基-N,N-二甲基叔胺(SCF-18)作为增稠剂,以NaHCO3为起泡剂,在酸性条件下交联,制得一种微泡沫酸性清洁压裂液。对该体系的性能进行了室内评价,结果表明,质量分数分别为3%SCF-18+0.5%缓蚀剂ATMP+3.6%NH4Cl+1%冰乙酸+0.5%NaHCO3,90℃、170 s-1剪切60min,压裂液的黏度为75 mPa.s,具有较好的耐温耐剪切性;在温度低于70℃时,储能模量远大于耗能模量,黏弹性良好;90℃体系的砂降速度为0.766 1 mm/s,具有很强的携砂能力;加入质量分数5%的原油,40 min即可破胶,破胶液黏度为2.84 mPa.s。通过化学反应形成的CO2微泡沫可以有效地降低压裂液的滤失量,同时可以提高返排率,降低对底层的伤害,改善压裂效果。
Synthesis of a nonionic surfactant fatty amide propyl-N, N-dimethyl tertiary amine (SCF-18) as a thickener to NaHCO3 as a foaming agent, under acidic conditions cross-linked to prepare a Micro-foam acid cleaning fracturing fluid. The performance of the system was evaluated indoor. The results showed that the mass fraction of 3% SCF-18 + 0.5% corrosion inhibitor ATMP + 3.6% NH4Cl + 1% glacial acetic acid + 0.5% NaHCO3, 90 ℃, 170 s-1 The viscosity of the fracturing fluid is 75 mPa.s after shearing for 60 minutes, which has good temperature and shear resistance. When the temperature is lower than 70 ° C, the storage modulus is far greater than the energy dissipation modulus and viscoelasticity is good. 90 ℃ system sand drop rate of 0.766 1 mm / s, has a strong sand carrying capacity; join the mass fraction of 5% of crude oil, 40 min to break plastic, broken gel viscosity of 2.84 mPa.s. The CO2 micro-foam formed by chemical reaction can effectively reduce the fluid loss of the fracturing fluid and meanwhile increase the backflow rate, reduce the damage to the bottom layer and improve the fracturing effect.