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以丙烯酰胺、丙烯酸和2-丙烯酰胺-2-甲基丙磺酸(AMPS)三元共聚物(PSAM)为稠化剂,乳酸锆为交联剂开发出一种海水基耐高温压裂液,考察了PSAM的水解度、相对分子质量、AMPS含量、稠化剂和交联剂的浓度、配比等因素对冻胶形成及耐温耐剪切性能的影响,通过测试不同条件下冻胶的储能模量(G’)随时间的变化,研究了Ca~(2+)浓度和AMPS含量对交联动力学的影响。交联动力学的研究表明,随AMPS含量加大,PSAM交联速度降低,达到交联平衡所需时间延长,随Ca~(2+)浓度增高,交联反应速度越快,冻胶初始强度越高;耐温性能测试表明,当稠化剂中羧酸基含量与交联剂中锆离子含量之比n(—COOH)/n(Zr~(4+))≈1时,体系的耐温耐剪切性能最优,高含量AMPS提升压裂液的耐温耐剪切性能。在优化稠化剂结构条件下,稠化剂质量分数为0.6%、交联剂质量分数为0.3%配制的海水基压裂液,在150℃、170 s~(-1)下剪切120 min后,黏度保持在150 m Pa·s以上,耐温耐剪切性能优秀。
A kind of seawater-based high temperature resistant fracturing fluid was developed by using acrylamide, PSMA as acrylamide and 2-acrylamide-2-methylpropane sulfonic acid (AMPS) as thickener and zirconium lactate as crosslinking agent The effects of PSAM degree of hydrolysis, relative molecular mass, AMPS content, concentration of thickener and crosslinking agent, formulation and other factors on gel formation and temperature-resistant and shear-resistant properties were investigated. (G ’) with time, the effects of Ca 2+ concentration and AMPS content on the crosslinking kinetics were investigated. The study of crosslinking kinetics shows that with the increase of AMPS content, the cross-linking speed of PSAM is reduced and the time required to reach the cross-linking balance is prolonged. With the increase of Ca 2+ concentration, the cross-linking reaction rate is faster and the initial strength of jelly glue High temperature resistance test showed that when the ratio of carboxylic acid groups in the thickener to zirconium ion content in crosslinker n (-COOH) / n (Zr ~ (4 +)) ≈1, the system temperature Shear resistance of the best, high content AMPS fracturing fluid to enhance the temperature resistance to shear resistance. Under the condition of optimized thickener structure, the seawater-based fracturing fluid with 0.6% mass ratio of thickener and 0.3% crosslinker was sheared for 120 min at 150 ℃ and 170 s ~ (-1) After the viscosity is maintained at 150 mPa · s or more, excellent resistance to temperature and shear properties.