The top stratum of Puguang 3 well belongs to highly steep structure, and its obliquity is big which result in borehole deviation.

• 普光3井上部地层属于高陡构造,地层倾角大,极易发生井斜,地层可钻性差,蹩跳钻严重,上部地层防斜打直是施工的难点。