大庆第一口聚驱水平井的储层深度预测

Prediction on Reservoir Depth of the First Polymer Flooding Horizontal Well in Daqing

南1-2-平25井在大庆油田是第一口挖潜厚油层顶部剩余油的聚驱水平生产井,在全国也属首例。该井轨迹设计中为提高避水厚度水平段在油层顶面穿行,水平井目的层油层顶面深度预测精度要求高。设计研究得出:目的油层的预测指标,是轨迹设计中的水平段所历经砂体的三维参数,关键参数是目的油层的顶面深度。通过井斜校正法和岩心分析法,预测出目的油层顶面深度的参数,形成了一套水平井轨迹设计的储层预测方法。指出直井储层发育的预测精度、直井储层深度的测量方法、补心海拔的测量时间、井斜方位的算法等,直接影响水平井目的油层的预测精度。同时给出了南1-2-平25井的储层预测实例。

Well N1-2 P25 is the first polymer flooding horizontal producer which produces the remaining oil in the top part of thick oil zone both in Daqing Oil Field and in China.The horizontal section is designed on the top face of the reservoir in order to increase the water avoidance thickness.The top surface depth of the target zone must be accurately predicted.The study shows that the prediction indexes of the target oil zone are the 3D parameters of the sandbodies penetrated by the horizontal section.The key parameter is the top surface depth of the target oil zone.Through hole deviation correction method and core analysis method,the parameter of top surface depth of oil zone is predicted,forming a set of reservoir prediction method for horizontal well trace design.This paper indicates that prediction accuracy of reservoir development,measurement method for reservoir depth of vertical wells,measuring time of bushing elevation and algorithm of hole deviation azimuth can directly affect the prediction accuracy of the target zone of horizontal well.Meanwhile,it gives a case study on the reservoir prediction of Well N1-2-P25.