The extended reach well has such chara cteristics as large horizontal displacement,great deviation angle and long open hole interval.

• 大位移井具有长水平位移、大井斜角以及长裸眼段的特点。大位移井钻井过程中摩阻扭矩的预测和控制是成功地钻成大位移井的关键因素之一。