Effect of Magnesia Whisker on Mechanical Property of Set Cement
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摘要: 为提高油井水泥石强度,选用镁质晶须MBW为增强剂,研究了MBW在不同掺量下对水泥浆体的基本性能及水泥石力学性能的影响,并通过XRD、MIP及SEM等表征方法进行了探讨。结果表明,油井水泥中掺入1%~5%的镁质晶须后,其浆体密度及凝结时间基本不变;流动度随晶须掺量的增加而降低,通过加入减阻剂USZ来改善;水泥石的抗压强度、抗折强度随晶须掺量的增加得到明显提高,当晶须掺量为4%时,80℃下水泥石1、3、7和28 d抗压强度比净浆水泥石分别提高8.3%、15.4%、21.5%和18.8%,抗折强度分别提高9.4%、19.4%、13.1%和0.3%。镁质晶须属于惰性微填料,可填充水泥石内部的有害孔隙,增加水泥石密实度,同时作为微纤维,在水泥石内部通过桥连、拔出、剥离、折断等作用机制起到对水泥石增强增韧的双重功效。Abstract: Study was conducted on the effect of MBW, a magnesia whisker, on the basic performance of cement slurry and the mechanical property of the set cement, with the aid of XRD, MIP and SEM. It was shown that addition of 1%-5% MBW into oil well cement slurry generally had no effect on the density and thickening time of the slurry. The mobility of the slurry, however, was reduced with the addition of MBW, but can be improved by the treatment with USZ, a drag reducer. With the addition of MBW, the compressive strength and flexural strength of the set cement were apparently enhanced. At 80℃, the 1 d, 3 d, 7 d and 28 d compressive strengths of a cement slurry treated with 4% MBW were 8.3%, 15.4%, 21.5% and 18.8% higher than that of the base cement slurry, respectively; the 1 d, 3 d, 7 d and 28 d flexural strength of the cement slurry (containing 4% MBW), on the other hand, were 9.4%, 19.4%, 13.1% and 0.3% higher than that of the base cement slurry. MBW is an inert additive, which fills in the detrimental pores in set cement, hence improving the tightness thereof. As a kind of micro fiber, MBW plays a role in hardening and toughening set cement through bridging, pulling, stripping and breaking.
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Key words:
- Well cementing /
- Magnesia whisker /
- Set cement /
- Mechanical property
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