提高油井水泥石抗CO_2腐蚀外掺料的性能  

Research on the Performance of An Additive to CO_2 Corrosion Resistance in Oil Well Cement

作　　者：张亮[1] 姚晓[1] 罗霄[1] 毛敬勋[2] 王顺利[2] 张嵇南[2] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]吉林石油集团有限公司钻井工艺研究院,吉林松原138000

出　　处：《石油钻探技术》2010年第4期15-18,共4页Petroleum Drilling Techniques

基　　金：国家高技术研究发展计划("863"计划)项目"低渗透油气藏复杂井用非水泥基固井材料研究"(编号:2006AA06Z225)资助

摘　　要：为提高油井水泥石抗CO2腐蚀的能力,进而提高油气藏开采质量和油井开采寿命,开发了抗CO2腐蚀外掺料F1。通过测试水泥石腐蚀前后抗压强度、渗透率、孔结构(MIP法测定)等性能及分析水泥石样品微观形貌和其腐蚀产物,评价了掺入F1水泥石的抗腐蚀性能。结果表明:在CO2分压2 MPa、150℃腐蚀介质中养护28d,掺入抗CO2腐蚀外掺料F1能够明显提高水泥石的抗CO2腐蚀性能。主要表现为:水泥石试块腐蚀后的抗压强度较未腐蚀水泥石试块有所提高;与原浆加砂水泥石相比,水泥石总孔隙率明显降低,且孔径分布趋于无害孔化(<50 nm);水泥石在7 MPa驱替压力下的水驱渗透率为0(原浆加砂水泥石的渗透率为0.91×10-3μm2)。F1的掺入使水泥石生成结构稳定的铝取代的雪硅钙石,有利于水泥石抗CO2腐蚀能力的提高。In order to improve oil well cement＇s CO2 corrosion resistance,service quality and life of reservoir,a corrosion-resistant mixture F1 was developed.By testing compressive strength,permeability and pore structure（method of mercury intrusion pore measurement,MIP） before and after the corrosion,and by analyzing the micro-structure and corrosive products,the cement performance of anti-corrosion was evaluated after adding F1.Results showed that adding F1 can effectively improve the anti-corrosion ability of cement in the environment with CO2 partial pressure of 2 MPa and being kept in 150℃ for 28 days.The compressive strength of cement with F1 is higher than that of non-corrosion sample.The total porosity of cement by adding F1 is reduced compared with the cement by adding sand.The pore sizes are mainly in the harmless pore size（50 μm）.The permeability at pressure of 7 MPa is 0（the permeability of cement with adding sand to the initial slurry is 0.91×10^-3 μm^2）.Therefore,adding F1 to cement has produced a tobermorite containing aluminium element with a stable structure to improve the anti-corrosion ability of cement in CO2 environment.

关 键 词：固井 油井水泥 掺料水泥 二氧化碳腐蚀 抗腐蚀性 

分 类 号：TE256.6[石油与天然气工程—油气井工程]