盐岩地层矿物离子对水泥浆性能的影响规律  

Influence of mineral ions in salt stratum on properties of cement slurry

作　　者：何斌斌 柳华杰[1] 郑若臣 步玉环[1] 殷慧 霍美桦 张军义 马小龙 HE Binbin;LIU Huajie;ZHENG Ruochen;BU Yuhuan;YIN Hui;HUO Meihua;ZHANG Junyi;MA Xiaolong(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;Technology Service Company,SINOPEC Huabei Oilfield Service Corporation,Zhengzhou 450042,China;Research Institute of Oil&Gas Technology,Changqing Oilfield Company,PetroChina,Xi an 710021,China;Well Cementing Company,SINOPEC Zhongyuan Oilfield Service Corporation,Puyang 457001,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中石化华北石油工程有限公司技术服务公司,河南郑州450042 [3]中国石油长庆油田分公司油气工艺研究院,陕西西安710021 [4]中石化中原石油工程有限公司固井公司,河南濮阳457001

出　　处：《中国石油大学学报（自然科学版）》2024年第6期85-94,共10页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51974355);国家青年基金项目(51804332)。

摘　　要：盐岩地层,特别是大段盐岩地层,富含的Na^(+)、Ca^(2+)、Mg 2+等无机盐离子,固井期间通过溶解、扩散进入水泥浆,会诱发水泥浆API性能改变,不利于固井安全和固井质量。以某储气库钻遇的盐岩地层为对象,通过能谱分析盐岩地层的矿物离子类型及含量,明确盐岩地层主要的无机盐种类;试验评价单一无机盐、复合无机盐对固井水泥浆API性能的影响规律。结果表明:单一无机盐会诱发水泥浆的某一项或几项API性能指标不符合标准要求,而复合无机盐对水泥浆各项性能指标均产生不利影响;加入NaCl∶CaSO_(4)∶MgCl_(2)=42∶50∶8(质量比)的复合无机盐,水泥浆稠化时间、流变性能变化最突出,稠化时间降幅达55.0%,稠度系数增加1260.5%;加入NaCl∶CaSO_(4)∶MgCl_(2)=88∶10∶2的复合无机盐,水泥浆滤失量、抗压强度变化最显著,滤失量增加58.2 mL,增幅158.2%,抗压强度损失9.0 MPa,降幅达38.3%;含有一定比例MgCl_(2)的盐岩地层固井,应注重水泥浆稠化时间、流变参数、抗压强度性能的优化;含有一定比例CaSO_(4)的盐岩地层固井,应强化水泥浆滤失量的优化。Salt stratum,especially large thicknesses of salt stratum,are rich in inorganic salt ions such as Na^(+),Ca^(2+),Mg 2+.They can enter the cement slurry through dissolution and diffusion during cementing,which will induce changes in the API performance of the cement slurry,and this is not conducive to cementing safety and quality.Taking the salt stratum drilled in a gas storage as the research object,the types and contents of mineral ions in salt stratum were analyzed by energy spectrum,and the main inorganic salt types in salt rock strata were determined.The influence of single type inorganic salt and composite inorganic salt on the API performance of cementing cement slurry was evaluated by laboratory tests.The test results show that a single type of inorganic salt will cause one or more API performance of the cement slurry to fail to meet the standard requirements,while the composite inorganic salt will cause adverse effects on all performance indexes of the cement slurry.When the composite inorganic salt NaCl∶CaSO_(4)∶MgCl_(2)=42∶50∶8(mass ratio)is added to the cement slurry,the thickening time and rheological property change most significantly,in which the thickening time decreases by 55.0%,and the consistency coefficient increases by 1260.5%.When the composite inorganic salt of NaCl∶CaSO_(4)∶MgCl_(2)=88∶10∶2 is added,the filtration loss and compressive strength change most significantly,in which the filtration loss increases by 58.2 mL,an increase of 158.2%,and the compressive strength loss is 9.0 MPa,a decrease of 38.3%.For salt stratum with a certain proportion of MgCl_(2),the cement slurry should pay attention to the optimization of thickening time,rheological parameters and compressive strength.For salt stratum with a certain proportion of CaSO_(4),cement slurry should strengthen the optimization of filtration.

关 键 词：固井 盐岩地层 水泥浆性能 氯化钠 硫酸钙 氯化镁 

分 类 号：TU528[建筑科学—建筑技术科学]