大庆油田水平井着陆点控制方法研究及其应用

Control method on horizontal well landing point in Daqing Oilfield

水平井着陆点控制过程中,地层倾角对斜深校直后的地层厚度影响较大,既影响标志层的选取,也影响着陆点垂深预测的精准性。为了解决这一问题,以视垂厚度对比模式为核心,建立了大庆油田水平井着陆点控制方法,其核心内容是:通过实钻井的视垂厚度对比模式,地层真实还原后与邻井对比,进行标志层的准确选取并计算出最接近地层真实构造的倾角;通过地层倾角选择合适的预测公式,逐步推算着陆点的垂深;结合随钻录井资料及时判断轨迹着陆,弥补测井曲线的盲区。2017年上半年经过大庆油田36口水平井的实际应用检验可知,该项技术的作用显著,平均入靶成功率达到了97.2%。

During the control of the horizontal well landing point,stratigraphic dip has great influence on the stratum thickness behind the straightening of the inclined depth,which not only influences the selection of the marker bed,but also affects the accuracy of the prediction of the landing point depth.In order to solve this problem,a method of controlling the landing point of horizontal wells in Daqing Oilfield was established with the contrast mode of the apparent vertical thickness as the core.The key content of the method is:through the apparent vertical thickness contrast mode of real drilling,the formation is compared with the neighboring wells after real reduction,selecting the marker bed and calculating the inclination angle,selecting the appropriate prediction formula to gradually calculate the vertical depth of the landing point according to stratigraphic dip calculated by the apparent vertical thickness mode.By combining mud logging data while drilling,the trajectory landing can be determined timely and the dead area of the log can be made up.In the first half of 2017,the application of more than 30 horizontal wells showed that the technology had significant effects and the average target successful rate reached 97.2%.