一种新型超深水低温早强剂
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摘要
近年来,中海油在中国南海已经开发了多口超深水井,水深最深超过2000 m,极端的低温环境对水泥石的强度发展提出了严峻的挑战。针对超深水的固井技术难题,开发出了新型超深水低温早强剂ACC与NS,并对其低温下的增强性能展开了研究。结果表明,ACC与NS的最佳加量分别为8%和3%;在3～15℃的低温下,ACC与NS能提高水泥石的24 h和48 h抗压强度;在15℃下,采用水化热分析仪和超声波强度分析仪对水泥浆进行24 h不间断监测,与空白样和原有早强剂相比,ACC和NS能够使水泥水化放热量和水化反应速率明显增加,水泥石强度发展速率得到明显地提升,同时静胶凝强度过渡时间明显缩短。该新型早强剂ACC与NS已经在中国南海WN-XX井进行了现场应用,效果良好。
CNOOC has in recent years drilled several ultra-deep water wells in South Sea of China, the deepest water depth has been more than 2,000 m. Extremely low temperature has imposed serious challenges to the strength of set cement. Two new low temperature early strength agents, ACC and NS, have been developed to deal with well cementing challenges in deep water drilling. Studies on the effects of ACC and NS on the early strength of cement slurry at low temperatures showed that the optimum concentrations of ACC and NS was 8% and 3%, respectively. At low temperatures between 3 ℃ and 15 ℃, ACC and NS can improve the 24-hour and 48-hour compressive strengths of set cement. Continual monitoring of cement slurries for 24 hours at 15 ℃ using hydration heat analyzer and ultrasonic strength analyzer showed that, compared with blank sample cement slurry and original early strength additives, addition of ACC and NS obviously increased the amount of heat of hydration and hydration reaction rate of cement. The rate at which the strength of the set cement was developing was obviously increased, while the transition time of the gel strength of the cement slurry was obviously shortened. ACC and NS have been used satisfactorily on the well WN-XX in China's South Sea.
CNOOC has in recent years drilled several ultra-deep water wells in South Sea of China, the deepest water depth has been more than 2,000 m. Extremely low temperature has imposed serious challenges to the strength of set cement. Two new low temperature early strength agents, ACC and NS, have been developed to deal with well cementing challenges in deep water drilling. Studies on the effects of ACC and NS on the early strength of cement slurry at low temperatures showed that the optimum concentrations of ACC and NS was 8% and 3%, respectively. At low temperatures between 3 ℃ and 15 ℃, ACC and NS can improve the 24-hour and 48-hour compressive strengths of set cement. Continual monitoring of cement slurries for 24 hours at 15 ℃ using hydration heat analyzer and ultrasonic strength analyzer showed that, compared with blank sample cement slurry and original early strength additives, addition of ACC and NS obviously increased the amount of heat of hydration and hydration reaction rate of cement. The rate at which the strength of the set cement was developing was obviously increased, while the transition time of the gel strength of the cement slurry was obviously shortened. ACC and NS have been used satisfactorily on the well WN-XX in China's South Sea.
引文
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[3]廖易波,冉瑞平,范鹏,等.深水PC-LoCEM水泥浆体系在LH16-1-1井的应[J].山东工业技术,2013(9):22-24.LIAO Yibo,RAN Ruiping,FAN Peng,et al.Application of deepwater PC-LoCEM cement slurry system in well LH16-1-1[J].Shangdong Industrial Technology,2013(9):22-24.
[4]NELSON B ERIK,GUILLOT DOMINIQUE.Well cementing[M].Schlumberger,2006:50-54.
[5]孙晓杰,余纲,郑会锴,等.AMPS水泥浆体系低温促凝剂的研究[J].钻井液与完井液,2016,33(1):84-87.SUN Xiaojie,YU Gang,ZHENG Huikai,et al.Study on low temperature accelerator for cement slurry[J].Drilling Fluid&Completion Fluid,2016,33(1):84-87.
[6]王同友,符军放,赵琥.纳米级水化硅酸钙晶种作为油井水泥促凝剂的研究[J].钻井液与完井液,2017,34(3):68-71.WANG Tongyou,FU Junfang,ZHAO Hu.Study on nano calcium silicate hydrate used as oil well cement accelerator[J].Drilling Fluid&Completion Fluid,2017,34(3):68-71.
[7]王政,杨英姿,李家和.水化硅酸钙晶种的制备及对水泥强度的影响[J].材料科学与工艺,2007,15(6)789-791.WANG Zheng,YANG Yingzi,LI Jiahe.Preparation of C-S-H-Phase nuclei and its effects on compressive strength of cement[J].Materials Science&Technology,2007,15(6):789-791.
[8]李献民,谭金海,雷成慧.三乙醇胺在混凝土工程中的应用[J].电力建设,1995(2):40-41.LI Xianmin,TAN Jinhai,LEI Chenghui.Application of triethanolamine in concrete work[J].Electric Power Construction,1995(2):40-41.
[9]HARUEHANSAPONG S,PULNGERN T,CHUCHEEPSAKUL S.Effect of the particle size of nanosilica on the compressive strength and the optimum replacement content of cement mortar containing nanoSiO2[J].Constr Building Mater,2014,50(2):471.
[10]张丰,白银,蔡跃波,等.混凝土低温早强剂研究现状[J].材料导报,2017(21):106-113.ZHANG Feng,BAI Yin,CAI Yuebo,et al.Research status of low temperature early strength agents for concrete[J].Materials Review,2017(21):106-113.
[11]耿建卫.一种低温早强低密度水泥浆[J].钻井液与完井液,2017,34(4):65-68.GENG Jianwei.Study and application of low temperature early strength low density cement slurry[J].Drilling Fluid&Completion Fluid,2017,34(4):65-68.