防漏堵漏低密度水泥浆技术  

Study on a Low Density Cement Slurry Capable of Preventing and Stopping Mud Losses and the Use of the Slurry

作　　者：田野[1] 马春旭[1] 赵军[1] 陈为行 王义昕 宋维凯[1] TIAN Ye;MA Chunxu;ZHAO Jun;CHEN Weixing;WANG Yixin;SONG Weikai(Oilfield chemicals Division,COSL,Yanjiao,Hebei 065201;Xinjiang Oilfield chemicals Department,COSL,Luntai,Xinjiang 841600)

机构地区：[1]中海油田服务股份有限公司油田化学研究院,河北燕郊065201 [2]中海油田服务股份有限公司新疆油化项目部,新疆轮台841600

出　　处：《钻井液与完井液》2024年第4期515-521,共7页Drilling Fluid & Completion Fluid

基　　金：中海油服公司级项目“低密度水泥浆体系优化研究”(E-23206007)。

摘　　要：跃进3-3XC井完钻井深达9432 m,水平钻进距离超过3400 m,刷新了亚洲最深和超深水平大位移井的纪录。该井地质结构复杂,施工难度大,对水泥浆性能要求高,除了高温、高压外,地层承压能力低,极易发生漏失。针对此类问题,通过研发新型功能性材料,构建了C-Lo PSD(1.30 g/cm^(3))、C-Lite STONE(1.60 g/cm^(3))与C-Hi PSD(1.40 g/cm^(3))三套低密度水泥浆体系,涵盖了中低温、高温等应用条件,并在跃进3-3XC井中成功应用,水泥浆性能满足固井需求。与之前用水泥浆体系相比,混浆效率、流变性、悬浮稳定性、水泥石抗压强度等明显提升。其中,C-Lite STONE(T_(BHC)=75℃/T_(TOC)=30℃)与C-Hi PSD(T_(BHC)=145℃/T_(TOC)=105℃)水泥浆体系在温差分别为45℃和40℃下,顶部48 h抗压强度达到8.1 MPa和14.3 MPa。跃进3-3XC井在施工期间多次遭遇漏失,通过使用自研的新型堵漏材料C-B62和C-B66,成功封堵裂缝,保证了固井施工的顺利进行。The well Yuejin-3-3XC is drilled to a measured depth of 9,432 m,with length of the horizontal section exceeding 3,400 m.This depth and length of horizontal drilling has broken the record of the longest horizontal section in the deepest and ultra-deep horizontal drilling in Asia.The well Yuejin-3-3XC penetrated formations with complex geologic characteristics,and was difficult to drill.Requirements for the properties of cement slurries are high;high temperature,high pressure,low pressure bearing capacity of the formations drilled have all to be considered to avoid losses of the cement slurries.To deal with these difficulties,three low density cement slurries,which are C-Lo PSD(1.30 g/cm^(3)),C-Lite STONE(1.60 g/cm^(3))and C-Hi PSD(1.40 g/cm^(3)),are formulated.These cement slurries can be used in medium-low and high temperature conditions,and have been successfully used in cementing the well Yuejin-3-3XC.Compared with the cement slurries previously used,these three new slurries have mixing efficiency,rheology,suspension stability and compressive strength of set cement that are significantly improved.Among the three cement slurries,the C-Lite STONE(T_(BHC)=75℃/T_(TOC)=30℃)and the C-Hi PSD(T_(BHC)=145℃/T_(TOC)=105℃)have the strengths of the top slurries in 48 h of 81 MPa and 14.3 MPa under the temperature differences of 45℃and 40℃,respectively.During drilling operation,the well Yuejin-3-3XC has encountered several times of mud losses.Use the self-made new lost circulation materials C-B62 and C-B66,the fractures into which the mud was lost were successfully sealed off,ensuring the smooth progress of the cementing operation.

关 键 词：超深井 大位移井 高温低密度水泥浆 粉煤灰 漏失 

分 类 号：TE256.6[石油与天然气工程—油气井工程]