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定义储能模量G′值 >0 .1Pa而≤ 1.0Pa的凝胶为弱凝胶 ,以G′值代表弱凝胶的强度。稳定的弱凝胶的G′值在角频率 0 .0 3— 2 .0rad/s范围内基本不变。详尽介绍了可用于 2 0 - 5 0℃低温油藏调驱的聚合物水基弱凝胶RNJ L的形成、配方和性能。在 30— 40℃ ,pH值 6— 8条件下 ,用矿化度 <10 0 0 0mg/L的水配制的 30 0— 12 0 0mg/LHPAM(M >5 .0× 10 6)、30 0— 5 0 0mg/L酚醛复合体RE(交联剂 )、5 0— 75 0mg/L交联助剂AN水溶液均能形成稳定的弱凝胶。成胶时间随AN、RE及HPAM浓度的增加而减小 ,弱凝胶强度 (模量G′)随HPAM浓度的增加而增大 ,随RE和AN浓度的增加通过极大值。RNJ L的成胶时间 (几小时到几天 )的控制可通过组分浓度的变化而不必借助pH值的调节。成胶温度超过 5 0℃时弱凝胶的G′值下降。在 30℃和 45℃下进行的长期稳定性测试结果表明 ,所测定的溶液成胶时间是初凝时间 ,完成凝胶化反应需要 3— 7天 ,G′值达到最高值约需要 30天 ,RNJ L弱凝胶可稳定存在至少 1年。
A gel with a storage modulus G ’value of> 0.1 Pa and <1.0 Pa is defined as a weak gel, with the G’ value representing the strength of the weak gel. The stable G ’value of the weak gel is essentially constant over the angular frequency range of 0 .0 3- 2 .0 rad / s. The formation, formulation and properties of polymer water-based weak gel RNJ L, which can be used in the control of low temperature reservoir at 20-50 ℃, are introduced in detail. 30 0-1200mg / LHPAM (M> 5.0 × 10 6) and 30 0 (30.0mg / L) were prepared from water with salinity <10 000 mg / L at 30-40 ℃ and pH 6-8 - 50 0mg / L phenolic complex RE (crosslinking agent), 5 0-75 0mg / L AN crosslinking agent aqueous solution can form a stable weak gel. The gel time decreased with the increase of AN, RE and HPAM concentration. The weak gel strength (modulus G ’) increased with the increase of HPAM concentration and reached the maximum value with the increase of RE and AN concentration. RNJ L gel time (hours to days) can be controlled by the concentration of components without the help of pH adjustment. The G ’value of weak gel decreased when the gelation temperature exceeded 50 ℃. Long-term stability tests at 30 ° C and 45 ° C showed that the gel time of the solution was the initial setting time and the gel reaction took 3-7 days. The G ’value reached the highest value for about 30 days, RNJ L weak gel can be stable for at least 1 year.