一、井斜原因井斜可定义为:钻头对所钻直井眼的偏移。井眼不是垂直的就是偏斜的,并可向任意方向偏移。打定向井时,需要井斜,而打直井时就不需要井斜(直井中出现狗腿或井斜角过大要影响井底的设计位置)。重要的是要认识到:在这两种情况中,井斜的基本原理是 First, the cause of the deviation Well deviation can be defined as: drill bit on the drilling of straight borehole offset. The borehole is either vertical or skewed and can be offset in any direction. When drilling a directional well, it is necessary to have a wellbore, whereas a wellbore is not required when drilling a vertical well (dogleg or vertical well angle in the vertical well is too large to affect the design position of the bottom of the well). It is important to recognize that in both cases the rationale for well deviation is