纠偏轨道设计的初始装置角允许值计算

在实钻过程中,纠偏轨道的设计参数必须满足一定的约束条件,才能设计出满足施工要求的纠偏轨道。以中靶约束为条件,建立了纠偏轨道设计参数的几何模型,推导出了单圆弧纠偏轨道设计参数的计算公式,给出了初始装置角允许取值范围上、下界限值的计算方法。通过算例验证了该算法的合理性和正确性,可将所有满足设计约束条件的初始装置角和井眼曲率绘制成设计参数允许取值范围图。当初始装置角和井眼曲率取值于该图的设计参数允许取值范围内,能够保证待钻设计轨迹满足井身参数的要求。本文的数学推理过程可进一步推广到定向井的圆形或椭圆形靶的情况,只需将圆弧平面与靶窗平面的交线扫过的范围修改成该交线与圆形或椭圆形靶的切点之间的范围。软件开发及其在实钻井眼轨迹监控中的应用表明,设计参数允许取值范围图可减少纠偏轨道设计的盲目性,提高设计质量。

Calculation on Permissible Value of Original Tool Surface Angle in Correcting Trajectory Design

During the process of actual drilling, correcting trajectory constraint condition to meet the ing trajectory design parameters design parameters of single-arc permissible range of the original through operation demands of the correcting design parameters must meet the certain trajectory.Geometric model of the correctis built under the condition of shooting constraint.Calculating formula of the correcting trajectory is derived and computing method for the limit value of tool surface angle is given.Rationality and validity of this method is verified the cases.Permissible value range chart may be mapped hole curvature under the constraint condition.When the value of by all original the original too tool surface angles and borehole curvature is less than the permissible value in this chart,the designed trajectory for drilling may meet the demands of well parameters.Mathematical rational process in this paper may be popularized to the condition of circle or oval target in the directional well only by the range cross the line of intersection between arc plane and target window plane changes into point of tangency range between the line of intersection and circle or oval target.Software development and its applicati chart of permissible value range of the design parameters ry design and improve the quality of the design. on in monitoring drilling well track show that the may make less blindness of the correcting trajectory design and improve the quality of the design.