粉末丁腈橡胶对固井水泥浆性能的影响

Effect of Powdered Acrylonitrile-butadiene Rubber（PNBR）on the Properties of Cement slurry

蒋 凯

JIANG Kai （CNOOC Inte

为开发适用于复杂井固井的柔性水泥浆体系，研究了粉末丁腈橡胶对固井水泥浆性能的影响，并观察了粉末丁腈橡胶水泥石微观形貌。研究结果表明，粉末丁腈橡胶表面包覆稳定，对水泥浆流变性和稠化时间影响较小，可以降低水泥浆的失水量，改善水泥浆稳定性。养护7 d后，含有3%粉末丁腈橡胶的水泥石试样的抗压强度较空白水泥石下降12.9%，但是其抗折强度和抗冲击强度分别提高了17.3%和19.7%。与空白水泥石相比，含有4%粉末丁腈橡胶的水泥石试样最大应变提高了58.1%，弹性模量下降49%。粉末丁腈橡胶加入到水泥浆中，水泥浆固化后橡胶粉填充在水泥水化产物之间，降低了水泥石脆性，提高了抵抗冲击载荷的能力。粉末丁腈橡胶能用于设计性能优良的柔性水泥浆体系。图11表2参18

In order to develop a flexible cement slurry system used for complex well cementing，the effect of powdered acrylonitrile-butadiene rubber（PNBR）on the properties of oil well cement-based composites was studied，and the micromorphology of cement sample with PNBR was observed. The results showed that surface coating of PNBR was stable，and it could reduce the water loss and improve the stability of cement slurry，while had little effect on the rheology and thickening time. After curing for 7 d，the compressive strength of cement stone with 3% PNBR was 12.9% lower than that of blank cement stone，but the flexural strength and impact strength of the samples was increased by 17.3% and 19.7%，respectively. Compared with the blank cement paste，the maximum strain of cement paste with 4% PNBR was increased by 58.1% and the elastic modulus was reduced by 49%.When PNBR was added to the cement slurry，the rubber powder was filled among the cement hydration products after the cement slurry solidification，which reduced the brittleness of the cement paste and improved the toughness of the cement paste.PNBR can be used to design flexible cement slurry system with excellent performance.

10.19346/j.cnki.1000-4092.2019.04.007