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丛式井钻进时直井段不能完全打直,造成造斜点处井斜方位角偏离较远。如果在造斜点处直接朝着目标方位定向造斜,受井眼惯性的影响,井底不能及时靠近设计线,从而使丛式井防碰问题更加严重。为此,从整个平台的安全角度出发,结合“三维绕障”方向计算模型,确定了初始定向工具面的安全范围,同时结合BZ34-4WP平台讨论了定向工具面不在确定的范围内时对井眼轨迹控制的影响。分析结果表明,考虑平台槽口整体安全情况和直井段轨迹数据以及目标井斜方位后,确定出初始定向工具面角的安全范围更为科学。
When drilling a cluster well, the straight section can not be completely straightened when drilling, resulting in deviation of the well inclination angle at the point of manufacture. If the beveling point is directly directed towards the target azimuth, it will be affected by the hole inertia and the bottom hole can not be close to the design line in time, so that the anti-collision of cluster wells is more serious. Therefore, from the point of view of the whole platform safety, combined with the calculation model of “three-dimensional bypass” direction, the safety range of the initial orientation tool surface is determined. At the same time, when the orientation tool surface is not in the definite range in combination with the BZ34-4WP platform Impact on well trajectory control. The analysis results show that it is more scientific to determine the safety margin of the initial orientation tool face after considering the overall safety situation of the platform notch and the data of the straight well trajectory and the oblique orientation of the target well.