CO_2腐蚀油井水泥石的深度及其对性能的影响  

Corrosive Depth and Effect on Oil Well Cement Stone by CO_2

作　　者：张聪[1] 张景富[1] 乔宏宇[1] 彭邦洲[1] 

机构地区：[1]东北石油大学

出　　处：《钻井液与完井液》2010年第6期49-51,共3页Drilling Fluid & Completion Fluid

基　　金：国家大学生创新性实验计划项目"深井防腐蚀水泥浆体系实验评价与优选"(091022003)

摘　　要：利用显微镜等仪器检测了CO2对油井水泥石的腐蚀深度,研究了CO2对水泥石的腐蚀深度及其对工程性能的影响。结果表明,水泥石的腐蚀深度随温度、CO2分压及腐蚀时间的增加而增加,可以依据腐蚀深度分别与温度、CO2分压及腐蚀时间之间存在的函数关系建立腐蚀深度计算模型;腐蚀深度可作为评价腐蚀程度的指标,利用腐蚀深度计算模型可对水泥石长期受腐蚀程度进行评价和预测;组成不同的水泥浆,水泥石腐蚀深度、强度降低率及渗透率增量不同,强度降低率及渗透率增量与腐蚀深度间的变化趋势也不同;改善体系组成提高体系初始强度及抗渗透能力能提高水泥石的抗腐蚀能力。设计出了适用于大庆油田120～150℃的深井固井用水泥浆配方。Corrosive depth of oil well cement stone by CO2 was measured and the corrosive effect on the engineering properties of that was studied as well.Laboratory experiments showed that the corrosive depth increased with the temperature the deferential pressure of CO2 and the corrosion time.The corrosive depth calculation model was established based on the linear relationship,square root and logarithm,which was related with corrosive depth temperature CO2 deferential pressure and corrosion time.The corrosive depth can be used to evaluate the degree of cement corrosion by CO2,and the corrosive depth calculation model also can be used to evaluate and predict the corrosive gradation of oil well cement stone.For different composition of cement slurries,there were different numerical values in corrosive depth,compressive strength drop rate and permeability increment.And the change trend of compressive strength drop rate and permeability increment with corrosive depth was also different.Moreover,the anti-corrosion performance of cement could be enhanced by increasing original compressive strength and antipermeating performance.The formula of deep well cementing slurry in 120-150 ℃ was obtained in Daqing oil field.

关 键 词：油井水泥 二氧化碳腐蚀 腐蚀深度 抗压强度 渗透率 

分 类 号：TE256.9[石油与天然气工程—油气井工程]