页岩气的钻井和开采过程中会产生大量的水基钻井岩屑。在这项研究中,使用WDC粉末作为不同质量分数(0,10%,30%,和50%)制备水泥砂浆。机械性能,吸水,然后研究了砂浆的重金属浸出以及相应的微观结构。结果表明,在WDC混合砂浆中形成了更高的孔隙率。例如,对照试样的孔隙率为16.7%,虽然孔隙率增加到20.6%,21.4%,混合10%的砂浆为25.0%,30%,和50%WDC,分别。因此,随着WDC替代率的增加,砂浆的力学性能下降,吸水率增加。例如,与10%和30%WDC混合的砂浆的抗压强度从对照试样的33.11MPa下降到29.33MPa和21.48MPa,分别。然而,根据中国标准(JGJ/T98-2010),混合砂浆仍满足M20强度等级。与50%WDC混合的砂浆的抗压强度为11.33MPa,然后满足M10强度等级。淋溶试验表明,按中国标准(GB3838-2002),掺加30%WDC以下砂浆的渗滤液水质仍为一级;掺加50%WDC砂浆的渗滤液水质为三级。which,然而,不会对环境造成安全问题。
Huge amount of water-based drilling cuttings (WDC) is generated during the drilling and exploitation of shale gas. In this study, WDC powder was used as a replacement of cement at different mass fraction (0, 10%, 30%, and 50%) to prepare cement mortars. The mechanical properties, water absorption, and heavy metals
leaching of the mortars were then investigated along with the corresponding microstructures. The results showed that a higher porosity was formed within the WDC-blended mortars. For instance, the porosity of the control specimen was 16.7%, while the porosity increased to 20.6%, 21.4%, and 25.0% for the mortars blended with 10%, 30%, and 50% WDC, respectively. Therefore, the mechanical properties of the mortars decreased and their water absorption increased with the increase of WDC replacement ratio. For example, the compressive strength of the mortars blended with 10% and 30% WDC decreased from 33.11 MPa of the control specimen to 29.33 MPa and 21.48 MPa, respectively. Nevertheless, the blended mortars still satisfied the M20 strength grade according to the Chinese standard (JGJ/T 98-2010). The compressive strength of the mortar blended with 50% WDC was 11.33 MPa and then satisfied the M10 strength grade. The
leaching test indicated that the water quality of leachates from the mortars blended with lower than 30% WDC remained as Grade I according to the Chinese standard (GB 3838-2002); the water quality of leachate from the mortar blended with 50% WDC was classified as Grade III, which, however, would not cause a safety issue to the environment.