井眼轨迹计算及预测模型—分段法

The Calculation and Prediction Model of Wellbore Trajectory-multi - interval Method

基于空间圆弧性质的分段法计算井眼轨迹相对于传统的直线和圆弧类方法而言,不仅具有直线法的易理解性、计算简便性,同时也具备圆弧类方法的较高的计算精度。通过将井眼轨迹离散测点间的弧线划分成尽可能多的逼近直线的小分段,然后将连续的小直线段在各方向上的增量进行叠加计算,即可得到精确的井眼轨迹。在井眼轨迹的三维可视化描述中,分段法可实现轨迹的精细化处理,同时此方法可预测相同钻井措施下的下一段井眼轨迹在各方向上的位移量,从而指导现场钻井作业的高效进行。

Compared with the conventional methods to calculate the wellbore trajectory, Multi - interval Method, based on the properties of arc, is not just as easy to understand and calculate as the traditional linear methods, but also as accurate as the traditional arc methods. By dividing the wellbore trajectory between two adjacent discrete pointsinto short arcs as many as possible, so that the very short arc can be regarded as line. Then calculating the successive connected short lines, and summing up the increments of same direction gotten form every line, so we can get the calculated wellbore trajectory between the two adjacent testing points accurately. Meanwhile, the multi - interval method can achieve refining processing in the 3D visual description of wellbore trajectory, and predict the next wellbore trajectory in the same measure of drilling operation, so that it can help to operate the drilling efficiently in field.