页岩气油气井水泥研究及生产制备

为探讨超细油井水泥性能和制备工艺，本文通过采用立式多转子气流分级机对油井水泥进行分级和相应工序处理获得7种不同颗粒粒径的油井水泥。利用激光粒度仪、X射线衍射仪、扫描电镜等分别对不同颗粒粒径油井水泥进行颗粒级配、矿物组成、水泥颗粒形貌及水泥石水化产物进行测试，同时测试稠化时间、稠度、流动度、强度等对其性能进行评价。研究结果表明，油井水泥在分级生产过程中出现分相现象；分级粗油井水泥在合适比例混合下可获得合格产品；不同颗粒粒径的油井水泥微观结构和物理性能差别大，随水泥比表面积增大，水泥颗粒间吸附力增强，浆体稠化时间缩短，初稠和水灰比增大，析水率降低，稳定性增加；在合适温度范围内，随温度升高，浆体强度增加，但颗粒过细，强度反而会下降。

Research and production of shale oil and gas well cement

In order to explore the properties and preparation technology of ultra-fine oil well cement, seven kinds of oil well cement with different particle sizes were obtained by classifying oil well cement and corresponding processes with vertical multi rotor air flow classifier. The particle gradation, mineral composition, cement particle morphology and cement hydration products of oil well cement with different particle sizes were tested by laser particle sizer, X-ray diffractometer and scanning electron microscope. At the same time, the thickening time, consistency, fluidity and strength were tested to evaluate its performance. The results show that phase separation occurs in the graded production of oil well cement; Graded crude oil well cement can obtain qualified products when mixed in appropriate proportion; The microstructure and physical properties of oil well cement with different particle sizes vary greatly. With the increase of cement specific surface area, the adsorption force between cement particles increases, the slurry thickening time decreases, the initial thickening and water cement ratio increase, the water precipitation rate decreases and the stability increases; In the appropriate temperature range, the slurry strength increases with the increase of temperature, but the strength will decrease if the particles are too fine.