胡-陈预测模型在凝析气藏开发中的应用

Application of Hu-Chen forecast model to the con-densate gas reservoir development.

凝析气藏具有特殊的热力学性质,当地层压力低于露点压力时,地层中流体将出现相态变化,使凝析油的产量变化复杂,难以采用简便方法加以预测。大量凝析气藏的矿场资料表明,其天然气与凝析油产量变化存在相互关联又相对独立的规律。所以把天然气和凝析油分别作为相对独立的对象进行研究,将预测模型方法引入到凝析气藏油、气可采储量及未来产量预测中。经实例计算的累积产量与预测值的相对误差在5％以内,证实了预测模型在凝析气藏油、气产量和可采储量的预测方面是可行的。

Condensate gas reservoir has special thermodynamic property. When the formation pressure is lower than the dew point pressure, formation fluids will has changes of phase state and complex production variance of gas condensate, which is difficult to forecast by using the simple method. A lot of condensate gas reservoir data show that there are interrelated but relatively independent laws between production variance of natural gas and gas condensate. Hence the natural gas and gas condensate as relatively independent subject were studied and the method of forecast model was introduced into the forecast of recoverable oil-gas reserves and future production in the condensate gas reservoir. The relative error between the actual cumulative production and forecasted figure is within 5%. The feasibility of forecast model for forecasting oil-gas production and recoverable reserves in the condensate gas reservoir was conformed.