多孔介质中束缚水对凝析油饱和度的影响

EFFECT OF IRREDUCIBLE WATER ON GAS CONDENSATE SATURATION IN POROUS MEDIA

为了更好地开发含水凝析气藏,必须研究在凝析气藏开发过程中束缚水对凝析油饱和度的影响,为此建立了超声波测试高温高压岩心中凝析油饱和度的直接测试和软件模拟方法。对于同样一块岩心在相同压力条件下,采用相同的凝析气样品来进行衰竭实验,多孔介质中凝析油饱和度随束缚水增加而降低;得到衰竭至大气压时残余油饱和度也随束缚水的增加而变小,且两者呈很好的线性关系。理论及实验表明,束缚水对凝析气藏开发的影响不可忽视。

In order to develop watered condensate gas reservoirs more effectively, the effect of irreducible water on gas condensate saturation must be investigated during the recovery process. Therefore, direct ultrasonic test and software simulation method were introduced for measurement of gas condensate saturation in high-temperature and high-pressure cores. Depletion experiment was conducted on the same core using the same condensate gas sample and under the same pressure condition. The result showed gas condensate saturation in porous media reduces with increase of irreducible water saturation; when the pressure depletes to the atmosphere standard, the irreducible oil saturation also decreases with increase of the irreducible water saturation, which shows well their smooth linear relationship. In conclusion, the effect of irreducible water on the development of condensate gas reservoirs is important to be considered.