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| 1 | Suspension mechanism and application of sand-suspended slurry for coalmine fire prevention显示文摘North and west China has abundant coal resources, however, such resources make these regions prone to serious mine fire disasters. Although the copious sand and fly ash resources found in these areas can be used as fire-fighting materials, conventional grouting is expensive because of water shortage and loess particles. A new compound material(i.e., a sand-suspended colloid), which comprises a mineral inorganic gel and an organic polymer, is developed in the current study to improve the quality of sand injection and reduce water wastage when grouting. The new material can steadily suspend the sand, through the addition of a small amount of colloid yielding steady sand-suspended slurry. The process of producing the slurry is convenient and quick, overcoming the shortage of sand-suspending thickeners which need heat and are difficult to produce. The space work model based on the theory of the double-electric layer is established to study the suspended mechanism of the solid particles in the sand-suspended colloid.The dispersion effect of the sand-suspended colloid is demonstrated by the incorporation of the electrostatic effect by the double-electric layer and the steric hindrance effect on the sand particles, ensuring the stability of the colloid system and the steady suspension of sand particles in the sand-suspended colloid.Mechanical analysis indicates that the sand is suspended steadily under the condition that the rock sand particles stress on the lower part of the fluid is less than the yield stress of the colloid. Finally, the fireprevention technology of sand suspension was applied and tested in the Daliuta Coal Mine, achieving successful results. | Xu Yongliang Wang Lanyun Chu Tingxiang Liang Donglin | 2014 | International Journal of Mining Science and Technology2014，24，5： | 5 |
| 2 | 高温高压含O2溴盐完井液中13Cr不锈钢的腐蚀行为研究显示文摘随着越来越复杂开发工艺的应用,油气田现场服役环境也变得更加复杂苛刻,一些现场操作环节(如井下回注CO2、回注采出水、药剂加注、环空注氮、管道试压、维修操作等)不可避免会将O2引入井下环境。O2的混入会导致井下管材发生不可预期的腐蚀风险,尤其对以13Cr不锈钢为代表的耐蚀油套管材,潜在局部腐蚀风险很高。针对溴盐完井液中O2混入导致井下管材腐蚀风险加剧的问题,采用高温高压腐蚀模拟实验,结合扫描电镜、能谱分析等微观表征手段,研究了高温高压含O2环境下不同浓度溴盐完井液中普通13Cr和超级13Cr两种典型不锈钢油套管材的腐蚀行为及机理。结果表明:在高温高压含O2溴盐完井液环境下,两种13Cr不锈钢的腐蚀速率均较高,尤其局部腐蚀速率;参照NACE PR-0775标准,普通13Cr在1.01 g/cm^3浓度的溴盐溶液中就已经属于严重腐蚀,并且随着溴盐质量浓度的升高,腐蚀程度不断加剧,在浓度为1.10 g/cm^3达到极严重腐蚀;当溴盐质量浓度达到1.40 g/cm^3时,两种材料的最大局部腐蚀速率均已超过5 mm/a;微观形貌分析结果表明,溴盐完井液中O2混入对13Cr不锈钢管材的耐蚀性能具有显著影响,这主要是由于O2混入降低了材料表面钝化膜的稳定性,点蚀萌生于材料基体表面致密富Cr钝化膜的破损处,向基体深部发展,蚀坑周边区域有大量腐蚀产物堆积,蚀坑与周边区域存在局部的电偶效应,进一步加速蚀坑的发展。 | 朱金阳 张玉楠 郑子易 许立宁 | 2020 | 工程科学与技术2020，52，5： | 4 |
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