Application and Analysis of the Synergy between Oil Well Cement Expanding Agents and Oil Well Cement Tougheners
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摘要: 为探索固井水泥增韧剂与膨胀剂协同作用效果,分别选取晶格膨胀剂、发气膨胀剂2种膨胀材料,纤维、碳纳米管(CNTs)2种增韧材料,对不同材料相互协同作用后的水泥浆的膨胀性能、力学性能、孔隙结构、常规性能进行了实验研究,并对不同组合的应用工况进行了分析。研究表明,自由膨胀条件下增韧剂与发气膨胀剂协同膨胀率较高,而在高温高压下,CNTs-膨胀剂组合抑制收缩效果较好;CNTs与晶格膨胀剂联合作用后强度提升最大,基体孔隙度最低,且以微孔为主;而纤维与发气膨胀剂组合的断裂残余强度最高;膨胀剂与增韧剂混合对水泥浆失水量、沉降稳定性有一定的提升,对稠化时间有一定的延迟作用;其中,CNTs与2种膨胀剂组合的浆体动切力较大,触变性较强。研究结果可为不同工况下固井水泥浆设计提供借鉴和指导。Abstract: Two expanding agents and two tougheners were selected to explore the synergy between oil well cement toughener and expanding agent. The expanding agents selected were a lattice expanding agent and a gas expanding agent, the tougheners selected were a fiber and a carbon nanotube (CNT). A cement slurry was treated with these agents whose synergy was investigated. Laboratory study was performed on the expansion performance, mechanical properties, pore structure and regular performance of the cement slurry, and the operating conditions of different combinations of the tougheners and expanding agents were analyzed. It was found from the study that under the condition of free expansion, the toughener and the gas expanding agent had higher synergistic expansion rate. The combination of CNTs and the expanding agents had better contraction inhibition effect at high temperature and high pressure. When CNTs were combined with the lattice expanding agent, the increase in the strength of the set cement was the greatest, the porosity of the cement matrix was the lowest and the pores were mainly micro ones. When the fiber was combined with the gas expanding agent, the crack residue strength was the highest. Combination of the expanding agents and the tougheners to some extent improved the filter loss and the settling stability of the cement slurry and retarded the thickening time of the cement slurry. Of the combination of the four agents studied, the combination of CNTs and the two expanding agents rendered the cement slurry higher yield point and stronger thixotropy. The study can be used as a reference and a guidance for the design of cement slurries used at different work conditions.
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Key words:
- Expanding agents /
- Toughener /
- Carbon nanotube /
- Mechanical property
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