涪陵页岩气田水平井轨迹调整方法

The Method to Adjust Horizontal Well Trajectory in Fuling Shale Gasfield

涪陵页岩气田采用水平井开发,做好水平井轨迹调整工作是保证水平井轨迹在优质页岩层中穿行且轨迹又相对平滑的重要条件。实钻过程中,根据不断变化的地质情况,对水平井轨迹进行及时跟踪调整:依据电性特征确定9个标志点,采用等厚计算法、等海拔计算法和地震预测法等预测方法,综合实钻资料,逐步确定靶点位置;根据实钻资料进行标志层对比,确定钻头位置,适时调整井斜,保证轨迹在目的层穿行。

Horizontal well development is employed in Fuling Shale Gasfield. Horizontal well trajectory adjustment is an important condition for guaranteeing that horizontal well trajectory can go through high-quality shale layer and the trajectory is relatively smooth. In the drilling process, it needs to timely track and adjust horizontal well trajectory according to ever-changing geological conditions: determining 9 mark points according to electrical characteristic, using some prediction methods including uniform thickness calculation, uniform altitude calculation and seismic prediction, synthesizing drilling data to gradually determine the target location, carrying out marker bed comparison based on drilling data to determine the drilling bit position and timely adjusting well deviation to ensure the trajectory going through target layer.