Research on the influence of silica fume on the long-term strength development of lightweight cementOA
Silica fume(SF)is commonly added to lightweight cement slurry(LWCS)to enhance strength and stability due to its nanoscale properties.However,the long-term strength development of SF-modified cement remains unclear.This study explores the effect of SF on the long-term strength of LWCS cured at 75℃,90℃,and 105℃,using compressive strength tests and microstructural analyses(XRD,SEM,EDS,TGA).SF initially improves strength through pozzolanic reactions,but over time,the C-S-H gel formed during hydration becomes more porous and looser.The addition of SF promotes the transformation of the C-S-H gel from a high Ca/Si ratio to a lower one,with rapid CH consumption accelerating porosity development.This weakens the bond between cement and hollow glass microspheres(HGMs),causing microcracks from stress differentials.These changes lead to internal bond deterioration and up to 56.76%strength reduction.While SF enhances early strength,it negatively affects long-term strength,raising the risk of cementing failure in oil and gas wells.Future research should focus on addressing long-term strength decline at higher temperatures and identifying alternative materials to mitigate this issue.
Haodong Li;Chengwen Wang;Dingye Li;Wenjian Yue;Feng Zhao;Yuanbo Xia
School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,ChinaNational Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China Key Laboratory of Unconventional Oil and Gas Development,Ministry of Education,Qingdao 266580,ChinaDepartment of Chemical Engineering&Analytical Science,The University of Manchester,Oxford Rd,Manchester M139PL,United KingdomSchool of Petroleum Engineering,China University of Petroleum,Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum,Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China
能源科技
Lightweight cementStrength developmentSilica fumeMicromechanicsLong-time curing
《Petroleum》 2026 (1)
P.69-79,11
supported by Project of Basic Science Center of National Natural Science Foundation of China(No.52288101)State Key Laboratory of Offshore Natural Gas Hyrates project“Investigation of Response Pattern of Fiber Optic Monitoring for Integrity of Well Bore for Hydrate Formation Cementing”(No.CCL2024RCPS0170RSN)the National Natural Science Foundation of China(No.52074329)CNOOC Project(2022FS-04)Project of the Fundamental Research Funds for the Central Universities(No.23CX05001A).
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