盐酸液稠化剂SC-1的研制

Preparation of Viscosifier SC-1 for Hydrochloric Acid

以煤油为分散介质,油水相体积比1∶2,水相中单体质量分数40%,AM、DMDAAC、AMPS三单体质量比4∶1∶1,通过反相乳液聚合制得了三元共聚物W/O乳状液,直接用作盐酸的稠化剂,其代号为SC-1。20%盐酸中SC-1加量由1%增至4%时,酸液黏度(30℃,170 1/s)由42 mPa.s增至94 mPa.s。SC-1加量为2.5%时,盐酸质量分数由15%增至28%,酸液黏度由89 mPa.s降至72 mPa.s。2.5%SC-1增稠的20%盐酸,加入0.3%CaCl2、0.2%Mg-Cl2或3.5%NaCl后在室温放置7天,酸液物态无异常;在60℃或90℃密闭放置4小时后,黏度保持率为91.9%或88.9%;与大理石的反应持续40小时后的质量分数大于5%。SC-1与多种常用酸液添加剂配伍。研制了含缓蚀剂、铁离子稳定剂、破乳剂、助排剂、黏土稳定剂的2.5%SC-1增稠的20%盐酸液。图1表3参8。

A tercopolymer W/O emulsion is prepared from monomers AM, DMDAAC, and AMPS in mass ratio 4：1：1 by inverse phase emulsion polymerization with oil （kerosene） to water phase volume ratio 1：2 and total mass fraction （MF） of monomers in water phase 40% and, notated as SC-1, used as such for vlseosifying hydrochloric acid. The viscosity （at 170 1/s and 3012 ） of gelled 20 % hydrochloric acid increases from 42 to 94 mPa· s when the SC-1 dosage increases from 1% to 4 % ; the viscosity of 2.5 % SC- 1 gelled acid decreased from 89 to 72 mPa·s when the MF of the gelled acid increases from 15% to 28%. For 2.5% SC-1 gelled 20% hydrochloric acid, no abnormaly is observed when the acid with 0.3% CaCL2, 0.2% MgCl2 or 3,5% NaCl added has stood at room temperature over 7 days; 91.9% or 88.9% initial viscosity is maintained after the acid has aged in dosed containers at 6012 or 9012 in 4 hrs; the MF of the spent acid is 〉5% after the acid has reacted with marble continuously over 40 hrs. SC-1 is compatible with various commonly used acid additives. A reeept of 2.5% SC-1 gelled 20% hydrochloric aeidizing fluid is presented with corrosion inhibitor, iron ion and day stabilizers, demulsifier, and baekflow aid added.