油井水泥浆与多功能钻井液泥饼界面离子扩散阻碍机理  

Hindering mechanism of ion diffusion at the interface between oil-well cement slurry and mud cake from multifunctional drilling fluid

作　　者：顾军[1] 李新宏[1] 先花[2] 曾鹏珲[3] 杨易骏[1] 何吉标[1] 温桂平[1] 沈彬亮[3] 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国石化河南油田公司石油工程技术研究院,河南南阳473132 [3]中国石化南方勘探公司井筒技术处,四川成都610041

出　　处：《石油学报》2013年第2期359-365,共7页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.51174180和No.40972103);中国石化石油工程技术先导试验项目(JSG12013)资助

摘　　要：对泥浆转化为水泥浆(MTC)固井液水化离子可扩散进入多功能钻井液泥饼的机理已有研究,但对油井水泥浆水化离子不能扩散运移进入多功能钻井液泥饼的机理尚未清楚。采用离子色谱仪、原子吸收分光光度计和X射线衍射仪,从油井水泥浆与MTC固井液离子组成的差异性入手,对油井水泥水化离子向多功能钻井液泥饼扩散运移的阻碍机理进行了研究。结果表明,油井水泥浆中Ca2+的质量分数远远大于MTC固井液中Ca2+的质量分数,在油井水泥与多功能钻井液泥饼界面生成了CaCO3、CaSO4和Ca(OH)2,而MTC固井液中Na+的质量分数则大于油井水泥浆中Na+的质量分数;Na+可改变泥饼中活性颗粒表面的ζ电位和破坏钻井液有机处理剂表面形成的水膜是MTC固井液中水化离子能扩散运移进入多功能钻井液泥饼的主要原因,而在油井水泥与多功能钻井液泥饼界面生成的CaCO3、CaSO4和Ca(OH)2沉淀堵塞孔道则是油井水泥浆水化离子不能扩散运移进入多功能钻井液泥饼的主要机理。The mechanism that hydration ions in the mud to cement slurry（MTC） cementing fluid can diffuse and migrate into the mud cake from multifunctional drilling fluid has been well researched,while it still remains unclear at present why hydration ions in the oil-well cement can not diffuse into the mud cake from multifunctional drilling fluid.Herein,we examined differences in ion compositions of the oil-well cement and the MTC cementing fluid by means of ion chromatography,atomic absorption spectrophotometer and X-ray diffraction,and investigated thoroughly the hindering mechanism that prevent hydration ions in the oil-well cement from diffusing and migrating into the mud cake from multifunctional drilling fluid.The result indicated that Ca2＋ in the oil-well cement has a mass fraction much higher than that in the MTC cementing fluid and can form CaCO3,CaSO4 and Ca（OH）2 at the interface between the oil-well cement and the mud cake from multifunctional drilling fluid.The mass fraction of Na＋ in the MTC cementing fluid,however,is much higher than that in the oil-well cement,moreover,Na＋ can change the ζ potential on the surface of active particles in the mud cake and destroy the water film formed on the surface of organic additives from drilling fluid,which are the major reasons that make hydration ions in the MTC cementing fluid capable of diffusing and migrating into the mud cake from multifunctional drilling fluid.Whereas,the CaCO3,CaSO4 and Ca（OH）2 formed at the interface of the oil-well cement and the mud cake from multifunctional drilling fluid may precipitate and block apertures,which is attributed to the main hindering mechanism that prevents hydration ions in the oil-well cement from diffusing and migrating into the mud cake from multifunctional drilling fluid.

关 键 词：固井二界面 油井水泥 泥浆转化为水泥浆 多功能钻井液 离子浓度 扩散运移 

分 类 号：TE256[石油与天然气工程—油气井工程]