低pH值钻井液用除钙剂  

Study on Calcium Removers for Low pH Drilling Fluids

作　　者：孙明波[1] 杨泽宁[1] 高晓辉[1] 

机构地区：[1]中国石油大学(华东)石油工程学院

出　　处：《钻井液与完井液》2013年第2期15-17,90,共3页Drilling Fluid & Completion Fluid

摘　　要：CaCO3和CaSiO3的溶解度受pH值影响较大,在钻井液pH值较低时,传统的除钙剂Na2CO3和Na2SiO3的除钙效果较差。针对pH值较低的钻井液体系,优选了新型除钙剂。实验发现,CaC2O4的溶解度受pH值影响较小,且溶解度较低;Na2C2O4在低pH值淡水钻井液中表现出良好的除钙效果,而K2C2O4在低pH值淡水钻井液和盐水钻井液中均表现出良好的除钙效果。因此,在低pH值淡水体系中可选用Na2C2O4作除钙剂,在低pH值盐水体系中可选用K2C2O4作除钙剂。The solubility of CaCO3 and CaSiO3 are influenced by pH heavily that the normal calcium removers Na2CO3 and Na2Si03 can not remove it effectively in low pH condition.In this paper,novel calcium removers are optimized,and the experimental results show that,CaC2O4 has low solubility and it is not influenced by pH obviously.Na2C2O4 can be used for fresh water drilling fluid system,and K2C2O4,can be used both for fresh water and brine drilling fluid systems.

关 键 词：钻井液 除钙剂 草酸盐 络合物 PH值 

分 类 号：TE254.4[石油与天然气工程—油气井工程]