考虑不同完井方式的高速非达西效应评价方法

研究表明，不仅在高产气井，在某些高产挥发性油藏以及其他储层条件下都有可能产生高速非达西渗流。目前常用的高速非达西渗流判别理论公式与解析公式均以裸眼完井为起点，未考虑实际生产中完井方式的影响。因此，在基于二项式的产能方程的基础上，考虑射孔完井对泄流面积的影响，推导出射孔条件下的高速非达西产能方程，并结合国外某高产井评价完井方式对其高速非达西效应的影响。结果表明，当孔密超过25 孔/m 时射孔完井的泄流面积大于对应的裸眼井，高速非达西效应相应减弱。因此在评价实际生产井近井地带的高速非达西效应时，必须考虑完井方式的影响。

Fast assessment methods for non-Darcy effect of wells completed in different ways

Previous research results show high-speed non-Darcy flow can occur in high-productivity gas wells, high-productivity volatile oil reservoirs and under various other reservoir conditions. Conventional theoretical equations and analytic formulas for high-speed non-Darcy flow are based on open-hole completion without considering the impact of actual completion mode in actual production. The newly developed productivity equation based on binomial expression takes the impact of perforation completion on drainage area into consideration in deriving high-speed non-Darcy productivity equation. Data from one high-productivity well overseas was used to assess the impact of completion on high-speed non-Darcy effect. The research results show perforation completion may generate higher drainage area when the perforation density is over 25 holes/m. Under such circumstance, high-speed non-Darcy effect is less intensive. In conclusion, the impact of completion mode shall be considered during assessment of high-speed non-Darcy effect in near-well zone of actual producers.