论文部分内容阅读
液体在低渗岩心中的流动存在惯性流动阻力 ,应用达西稳定流方法测量岩心液体渗透率是不适宜的。根据非达西流动方程和连续性方程的联合求解 ,得到压差变化的对数与时间存在线性关系 ,由直线斜率可以计算岩心的液体渗透率。据此原理开发的压力脉冲测量装置由岩心夹持系统、数据采集与处理系统和压力脉冲系统三部分组成。通过刻度脉冲系统参数和采集岩心上游与下游之间的压差随时间的变化关系 ,经计算软件自动处理后 ,获得岩心液体渗透率值。实测岩心结果表明 :压力脉冲技术测量误差小 ,耗时短 ,适用于 0 .0 1× 10 -3 μm2 ～ 10 0× 10 -3 μm2 渗透率的岩心。
The flow of liquid in low permeability core has inertial flow resistance. It is not suitable to use Darcy steady flow method to measure core liquid permeability. According to the combined solution of non-Darcy flow equation and continuity equation, the logarithm of the pressure drop has a linear relationship with the time. From the slope of the straight line, the liquid permeability of the core can be calculated. The principle of pressure pulse measuring device developed by the core holding system, data acquisition and processing system and the pressure pulse system consists of three parts. By calibrating the pulse system parameters and collecting the pressure difference between the upstream and the downstream of the core over time, the permeability of the core fluid was obtained after the calculation software automatically processed. The measured core results show that the pressure pulse technique has the advantages of small measurement error and short time-consuming, and is suitable for cores with permeability of 0 × 10 -3 μm 2 -1 0 × 10 -3 μm 2.