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井斜是在钻井过程中衡量井身质量的重要指标。实践证明,用井斜角或用全井最大井斜度是非常不完善的,甚至不能据以判明井身质量。因此,对井斜的概念现已放弃总井斜度或全井最大井斜3°或5°的说法,而广泛采用包括方位角在内的以“狗腿严重度ε”来表示的方法。也即反映一定长度井段内井斜角与方位角的综合变化,或定长井段首尾两测点间井斜角与方位角的相对变化的方法。为了方便现场,能在钻井过程中及时掌握井身质量情况,我们推导了“狗腿严重度”
Inclinometer is an important indicator of the quality of wellbore during drilling. Practice has proved that the use of well angle or the maximum well inclination with the whole well is very imperfect, and can not even determine the wellbore quality. Thus, the notion of well deviation has now abandoned either the total well slope or the full well deviation of 3 ° or 5 °, while the widely used method, including azimuth, is the “dogleg severity ε”. That is, it reflects the comprehensive change of well inclination and azimuth within a certain length of well section, or the relative change of well angle and azimuth between head and tail of well section. In order to facilitate the scene, in the process of drilling well in a timely manner to grasp the quality of the well, we deduced the “dog leg severity”