摘要
MTA凝饼形成剂在低温环境中出现的析晶现象给MTA方法的推广和应用提出了新的挑战,充分认识MTA凝饼形成剂的低温稳定性能具有重要的理论意义和使用价值。通过单因素析晶对比试验可知,温度降低是溶质析晶出现的主要原因。通过离子色谱(IC)测试分析析晶前后阴离子浓度(主要是Cl-、NO3-、SO42-)的变化,确定析出的晶体为十水硫酸钠。研究发现,GA-ⅠA溶液中同时存在同离子效应和氢键作用,其中同离子效应不利于硫酸钠溶液的稳定,而氢键作用则可以促进硫酸钠溶液的稳定,在一定条件下,两者相互作用处于一个动态平衡,共同影响MTA凝饼形成剂的低温稳定性能。
The crystallization phenomenon of the MTA （mud cake to agglomerated cake） ag-glomerated cake forming agent at low temperature brings a new challenge to the popularization and application of MTA method .It is of great theoretical significance and use value to fully un-derstand its stability performance at low temperature .The result of single factor comparative ex-periment showed that temperature decreasing was the main reason for the phenomenon of solute crystallization .The changes of anion concentration （such as Cl - ,NO3 - ,SO42 -） before and after crystallization were analyzed by ion chromatography （IC） ,and the precipitated crystal was deter-mined as sodium sulfate decahydrate .The research result showed that common-ion effect and hy-drogen bonding coexist in GA-ⅠA solution .Common-ion effect was unfavorable to the stability of sodium sulfate solution ,while hydrogen bonding was opposite .In certain condition ,interac-tion between them was in dynamic equilibrium ,which influenced simultaneously and mutually the stability performance of the MTA agglomerated cake forming agent at low temperature .
出处
《石油与天然气化工》
CAS
CSCD
2014年第1期67-72,共6页
Chemical engineering of oil & gas
基金
国家自然科学基金项目"钻井液/水泥浆不变条件下固井二界面泥饼固化机理与交联机制"(51174180)
关键词
固井二界面
凝饼形成剂
溶质析晶
同离子效应
氢键作用
cement-formation interface,the agglomerated cake forming agent,solute crystalli-zation,common-ion effect,hydrogen bonding
