铁离子稳定剂SWLY-1的性能评价

Performance Evaluation of a Ferric Ion Stabilizer SWLY-1

酸化作业时,Fe^(3+)容易生成Fe(OH)_3沉淀而造成地层的二次伤害。自制铁离子稳定剂SWLY-1能与铁离子形成稳定的可溶性螯合物。通过室内实验评价了SWLY-1的相关性能。结果表明,SWLY-1对三价铁离子的稳定能力为1435 mg/g;最高可抗150℃高温;在清水、20%盐酸、土酸(12%HCl+6%HF)中的溶解性好,对岩心的渗透伤害率较小;与其他酸液添加剂配伍性良好;SWLY-1与EDTA-2Na、柠檬酸、草酸、乙酸在不同pH值下稳定常数的大小顺序均为:lgK_(SWLY-1)>lgK_(EDTA-2Na)>lgK_(柠檬酸)>lgK_(草酸)>lgK_(乙酸)。

In the operations acidification, the Fe3 ＋ easily forms Fe （OH） 3 precipitation which cause secondary damage of strata. Self-made synthetic ferric ion stabilizer SWLY-1 with ferric ion can form a stable soluble chelate. In this paper, the relative property of SWLY-1 was investigated. The results showed that the ability of stability stable ferric ion of SWLY-1 of 1435 mg/g. The maximum resistance of SWLY-1 to high temperature was of 150℃ and the solubility was good in water, 20% hydrochloric acid, mud acid （12% HCl＋6%HF）.The damage of SWLY-1 on the core permeability was low, and it had good compatibility with other acid additives. With the stability constants at different pH values as evaluation index, several ferric ion stabilizers including SWLY-1, EDTA-2Na, citric acid,oxalic acid and acetic acid,was arranged as follows： SWLY-1〉EDTA-2Na〉citric acid〉oxalic acid 〉 acetic acid.