Mahmoud Ahmed Abdulhamid, Elkatatny Salaheldin, Ahmed Abdulmalek, Gajbhiye Rahul
College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia.
Materials (Basel). 2019 May 5;12(9):1452. doi: 10.3390/ma12091452.
High-temperature conditions drastically compromise the physical properties of cement, especially, its strengths. In this work, the influence of adding nanoclay (NC) particles to Saudi class G oil well cement (OWC) strength retrogression resistance under high-temperature condition (300 °C) is evaluated. Six cement slurries with different concentrations of silica flour (SF) and NC were prepared and tested under conditions of 38 °C and 300 °C for different time periods (7 and 28 days) of curing. The changes in the cement matrix compressive and tensile strengths, permeability, loss in the absorbed water, and the cement slurry rheology were evaluated as a function of NC content and temperature, the changes in the structure of the cement surfaces were investigated through the optical microscope. The results revealed that the use of NC (up to 3% by weight of cement (BWOC)) can prevent the OWC deterioration under extremely high-temperature conditions. Incorporating more than 3% of NC severely damaged the cement matrix microstructure due to the agglomeration of the nanoparticles. Incorporation of NC particles increased all the cement slurry rheological properties.
高温条件会严重损害水泥的物理性能，尤其是其强度。在这项工作中，评估了在高温条件（300°C）下向沙特G级油井水泥（OWC）中添加纳米粘土（NC）颗粒对其强度抗衰退性能的影响。制备了六种含有不同浓度硅粉（SF）和NC的水泥浆，并在38°C和300°C条件下进行了不同养护时间段（7天和28天）的测试。评估了水泥基体抗压强度和抗拉强度、渗透率、吸水量损失以及水泥浆流变学随NC含量和温度的变化情况，通过光学显微镜研究了水泥表面结构的变化。结果表明，使用NC（最高占水泥重量的3%（BWOC））可以防止OWC在极高温度条件下劣化。掺入超过3%的NC会因纳米颗粒的团聚而严重破坏水泥基体微观结构。掺入NC颗粒提高了所有水泥浆的流变性能。
