非达西流对凝析气藏的伤害

DAMAGE OF NONDARCY FLOW ON CONDEN-SATE RESERVOIRS

反凝析污染对凝析气井的伤害是凝析气藏开发中遇到的一个非常重要的问题,它将降低凝析气井产能,导致凝析油采收率的下降。而影响凝析气藏开发的另一项主要因素是非达西流,它将造成凝析气藏近井地区的凝析油析出、孔道堵塞、渗透率降低。文章针对上述两大问题进行了深入的研究,给出了利用实验定量测定反凝析污染程度的方法;同时结合某具体凝析气田数据,使用油藏工程方法研究了紊流对其影响的程度,利用数值模拟方法模拟了在不同紊流系数下该凝析气田开发方案。通过指标对比分析,得出了气井的非达西效应对凝析气藏开发效果的影响程度和定量研究反凝析污染和非达西流影响程度的方法,为合理开发凝折气藏提供了理论参考。

The damage of retrograde condensate pollution on condensate gas wells is a very important problem while condensate reservoirs are developed, which will decrease the productivity of the condensate gas wells and cause the recovery factor of condensate oil decreasing. Another major factor to influence condensate reservoir developing is non-Darcy flow, which will make the condensate oil precipitating, the porous channel plugging,and the permeability decreasing in the zones near the wells of condensate reservoirs. Deeply studying the above 2 problems, the article proposes the method to measure the level of retrograde condensate pollution by experiments quantitatively. Also, with the real data of someone condensate gas field, the reservoir engineering method is used to study the influence of turbulent flow on the condensate gas field,and the numeral simulation method is used to simulate the developing programs of the condensate gas field under different turbulence coefficients. With indexes comparing, the influence of non-Darcy's effect of gas wells on the developing results of condensate reservoirs is determined, and the quantitative study method of the influence of retrograde condensate pollution and non-Darcy's flow is obtained. It provides the theoretic reference for reasonable development of condensate reservoirs.