钻修井地层孔隙压力预测模型及其应用

PREDICTIVE MODEL AND ITS APPLICATION OF GEOLOGIC PORE RESSURE ON DRILL-REPAIRED WELL

为了能够准确预测钻修井地层孔隙压力,减少井下复杂事故的发生,文中应用渗流力学理论和油藏工程方法,根据待钻修井周围油水井的动静态资料,利用多井作用于任一点(待钻修井)处的地层压力势差为各相关井单独作用于这一点的势差总和原理,建立了地层孔隙压力预测的数学模型,该模型包括稳定流、不稳定流和受断层影响井三种情况。应用该模型对大庆油田杏四、杏五区待钻修井地层孔隙压力进行了预测,结果表明:该方法能准确预测待钻修井处地层孔隙压力,绝对误差为±0.5MPa,吻合程度较好。

Based on the dynamic and static data of oil well and water well about being drill-repaired well in this article, the mathematical model of forecast reservoir pore pressure has been established by using filtration theory and petroleum reservoir engineering method. The model considers three types well affected by steady flow, unstable flow and fault, it can predict reservoir pore pressure with accuracy on drill-repaired well and reduce downhole complicated accident. At the same time, the drill-repaired well’s pore pressure in Xingsi and Xingwu block in Daqing oilfield was predicted by using the model. The results show that this method can predict the pore pressure of drill-repaired well truly and absolute error is ±0.5Mpa, and they are basically inosculated with predictive results.