凝析油气藏稳定测试计算及产能预测方法

PRODUCTION WELL TESTING IN A CONDENSATE RESERVOIR AND THE PREDICTION OF THE WELL CAPACITY

本文通过对相态图、相对渗透率曲线可流动相含油饱和度极小值及生产过程中含油饱和度极大值的分析,证实渤海海陆凝析油气藏在全部压力改变过程中,地层中虽有凝析油析出.但不能形成可流动相。因此,井的无阻流量和合理工作制度,在适当换算之后,可用单相气二项式及指数式进行计算。本文又从实测资料出发分析了二项式和指数式方程,绘制了产能结构曲线,给出了产量、压力校正方法,从而提高了不同压力下产能预测的可靠性。还根据紊流涉及半径计算及粘滞阻力占主导的特征,建立了流动系数与产能的相关关系曲线及经验方程,从而可预测产能和判断新井完善状况。

By a study of the relative permeability,minimum value of the movable oil saturation,and the maxial oil saturation in the production process,this pa- per confirms that in all the condensate reservoirs both onshore and offshore,no movable liquid phase is formed though liquid condensate is formed in the rese- rvoir due to the pressure change in production.Thus,,binomial and exponential expression for a single phase gas flowing gas can be used to give the open flow capacity and proper production rate of the gas well after a certain treatment of the well testing data.In this paper binomial and exponential expressions are analyzed by using actual field to const(?)st production structure curves to give a modification of the production and pressure,and thus the reliability of the pro- duction capacity prediction is improved.Curves correlating Kh/μ and the produ- ction capacity and empirical formulas are established according to main characte- ristics of determination of radius of turbulence and viscous resistance,and thus the production capacity and the skin factor of gas wells can be predicted.