气顶油藏油气界面移动距离的计算

针对带地层倾角的气顶油藏,利用跟踪质点的拉格朗日法描述油气界面移动的力学特性;借助油气渗流的基本微分方程组,并假设油气界面呈平直线移动,求解气井和油井单独定流量生产时的油气界面移动;将计算模型进行实例计算.结果表明:随着地层压力的降低,油气界面上气相势的下降要比油相势大很多;油井单独生产时,油气界面偏向油井方向移动,而气井单独生产时,油气界面偏向气井方向移动;合理的控制采油采气速度,可以较好地保持油气界面的稳定.

Calculation of Oil-Gas Contact Migration Distance in Gas Cap Reservoir

For gas cap reservoir with strata dip,mechanical property of oil-gas contact movement is described by particle-tracing of Lagrange. With assumption of straight line movement,movement of oil-gas contact is obtained by basic differential equations of oil and gas seepage. Application results show that: With decrease of reservoir pressure,decline of gas phase potential is much greater than oil phase potential; Oil-gas contact intends to move towards oil well as oil rim is only developed; On the contrary,oil-gas contact intends to move towards gas well as gas cap is only developed; Rational control of oil recovery rate and gas recovery rate is beneficial to stabilize oil-gas contact.