Mechanism and performance of a lithium chloride accelerator
- 期刊名字:石油科学(英文版)
- 文件大小:
- 论文作者:Wang Chengwen,Wang Ruihe,Cheng
- 作者单位:School of Petroleum Engineering,Department of Drilling Strategy and Planning,Drilling Engineering and Technology Corp.
- 更新时间:2023-02-26
- 下载次数:次
To address present concerns about thickening time and high early-strength in deepwater cementing at low temperatures when using conventional accelerators,a new type of set-accelerating admixture comprising of lithium chloride,aluminium hydroxide and alkaline metal chlorides,named as LS-A,was studied in this paper.Mechanism analysis and performance tests show that the accelerator LS-A accelerated the hydration of tri- and dicalcium silicates (C3S and C2S) at low-temperatures by speeding up the breakdown of the protective hydration film and shortening the hydration induction period.Therefore,LS-A could shorten the low-temperature thickening time and the transition time of critical gel strength from 48 to 240 Pa of the Class-G cement slurry,and improve the early compressive strength of set cement at low-temperatures.It exhibited better performance than calcium chloride and had no effect on the type of hydration products,which remain the same as those of neat Class-G cement,i.e.the calcium silicate gel,Ca(OH)2 crystals and a small amount of ettringite AFt crystals.LS-A provides an effective way to guarantee the safety of cementing operations,and to solve the problems of low temperature and shallow water/gas flowing faced in deepwater cementing.
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