粉煤灰基地聚合物油井水泥优化配伍及性能研究

Component Optimization and Performance of Geopolymer Oil Well Cement from Fly Ash

为探究粉煤灰基地聚合物用作油井固井完井材料的可行性,采用正交试验法和单因素变量法研究地聚合物体系组分配伍、凝结调控和性能优化,采用等温量热仪和X射线粉末多晶衍射仪(XRD)研究缓凝剂对其反应进程和反应产物的影响。结果表明:地聚合物油井水泥(GOWC)的最佳配比为:碱激发剂当量9%且其模数1.00,缓凝剂种类AMPS-2且其掺量7.5%,水固比0.44;GOWC的8 h和24 h抗压强度均随缓凝剂掺量增大而降低,缓凝剂对GOWC后期强度发展影响较小;GOWC初凝时间随缓凝剂掺量增大先缩短后延长,缓凝剂对GOWC初凝时间具有一定的可调可控作用;水化热和XRD结果也表明,缓凝剂AMPS-2对地聚合物反应起到了延缓作用。

In order to study the feasibility of using geopolymer as new cementing materials, orthogonal test method and single factor variable method were used to optimize their composition and performance, and an isothermal calorimeter and X-ray powder polycrystalline diffractometer(XRD) were used to study the influence of the chosen retarder on the heat of hydration and reaction products.The results show that the optimum mixture ratio of GOWC,alkali equivalent is 9% and alkali activator modulus is 1.00;retarder type is AMPS-2 and its content is 7.5%;water-solid ratio is 0.44.Compressive strength of GOWC at 8 h and 24 h decreases with the increase of the retarder content, and the retarder has little effect on the later strength development of GOWC.The initial setting time of GOWC tends to be shortened and then prolonged with the increase of the retarder content, and the retarder has a certain adjustable and controllable effect on the initial setting time of GOWC.The heat of hydration and XRD results also show that AMPS-2 has an effective slowing down on the geopolymer reaction.