阻止层间连通的水泥鞘完整性与静态凝胶强度 (SGS) 密切相关。API 标准 65-2 非常重视临界凝胶强度期 (CGSP) 测量，该测量从临界静态凝胶强度 (CSGS) 达到时开始，到达到 500 磅力/100 平方英尺时结束。业界公认的测量SGS发展的三种方法是连续和间歇旋转，其次是超声波测量。完整的论文中提出了一项基于实验室的研究，比较了这些测量方法。
连续旋转装置。用于直接SGS测量的连续旋转装置配备有能够维持模拟实际固井条件的设定温度和压力的压力容器。通过连续运动产生的桨阻力通过相关性被转换并测量为 SGS。
间歇旋转 SGS 装置。该装置使待评估的水泥浆在受控温度和压力的压力容器内处于静态状态。
Cement-sheath integrity preventing interzonal communication is closely related to static gel strength (SGS). API Standard 65-2 puts importance on the critical gel strength period (CGSP) measurement, which begins when the critical static gel strength (CSGS) is developed and ends when 500 lbf/100 ft2 is attained. The three methods accepted in the industry to measure SGS development are continuous and intermittent rotation, followed by ultrasonic measurement. A laboratory-based study is presented in the complete paper that compares these measurement methods.
Continuous-Rotation Device. The continuous-rotation device used for direct SGS measurement is equipped with a pressure vessel capable of maintaining the set temperature and pressure that simulates actual cementing conditions. The paddle drag created by the continuous movement is converted and measured as SGS by means of correlation.
Intermittent-Rotation SGS Device. This device keeps the cement slurry to be evaluated in a static condition inside a pressure vessel at controlled temperature and pressure.
