压裂凝析气井产能影响因素模拟分析

SIMULATION ANALYSIS OF PRODUCTIVITY-AFFECTING FACTORS FOR FRACTURED CONDENSATE WELLS

凝析油气藏与常规油气藏的重要区别在于其生产过程的相态变化特性,富含凝析油的重组分的凝析量远远大于轻组分,压裂后在裂缝周围地带也会产生凝析油的析出现象。文章应用油气相的渗流模型,结合相平衡、初始条件和定压边界条件,以简化的组分模型为基础,使用IMPES数值计算得到了预测凝析油气藏压裂前后生产动态的数值计算方法,并以东濮凹陷QK气田某生产井为例给出了压裂后凝析液、天然气产能变化规律。最后,结合组分、裂缝长度变化,综合分析了引起产能变化的原因。

It is the major difference between condensate reservoirs and the average reservoirs the phase behavior variation of condensate reservoirs will happen in the process of exploitation. The condensate volume of the heavy components with rich condensate oil is much more than that of light components. The condensate oil will also separate out a-round the fractures after fracturing. With the oil/gas phase percolation model, integrating the phase balance, the initial conditions, and the boundary conditions with constant pressure, based on the simplified component model, the numerical calculation method is developed by IMPES numerical calculation to predict the production performance before/after fracturing for condensate reservoirs. Taking some production well of QK Garfield in Dongpu sag as example, the productivity changing law is found for condensate liquid and natural gas after fracturing. In the end, integrating the variation of components and fracture length, the reasons causing productivity change are analyzed comprehensively.