本文探讨了由适当比例的普通油井水泥、矾土水泥、石膏和膨润土组成的油井膨胀水泥,在不同水热条件下的物理力学性能、膨胀性能和不透水性能,及其影响因素。相分析证明,提高水热温度以及延长水热处理时间,均能加速一硫酸盐型水化硫铝酸钙的形成。最后,讨论了水泥石膨胀的产生。 This paper discusses the physical and mechanical properties, swelling properties and water impermeability of oil well expansion cements composed of appropriate proportions of ordinary well cement, alumina cement, gypsum and bentonite, and their influencing factors under different hydrothermal conditions. Phase analysis shows that increasing the hydrothermal temperature and prolonging the hydrothermal treatment time can all accelerate the formation of a sulfate-type hydrated calcium sulphoaluminate. Finally, the development of cement stone expansion was discussed.