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中文摘要：
井下磁源作为双水平井随钻磁导向系统的信号源,是该系统的核心部件之一。基于RMRS磁短节的原理,通过增加单位长度上安装的永磁圆柱体个数,设计了长度更短的井下磁源。利用有限差分法,计算分析了井下磁源和RMRS磁短节对底部钻具组合造斜能力的影响,同时通过试验,对比了井下磁源和RMRS磁短节的磁场强度,并且利用有限元软件,计算分析了井下磁源和RMRS磁短节的机械强度。计算和试验结果表明,与RMRS磁短节相比,在保持磁场强度基本相同的情况下,设计的井下磁源减小了对底部钻具组合造斜能力的影响,更有利于对井眼轨迹的控制。该产品的设计对于双水平井钻井技术的现场应用有重要意义。
英文摘要：
As the signal source of magnetic guidance system for drilling twin parallel horizontal wells, downhole magnetic source is one of the core components of the system. Based on the principle of RMRS magnetic suh, a shorter downhole magnetic source is designed by increasing the number of permanent magnets per unit length. The effects of downhole magnetic source and RMRS magnetic sub in the whipstocking capability of bottom hole assembly are calculated using the finite difference method. The magnetic field strength of downhole magnetic source and RMRS magnetic sub was compared by experiment. And, the mechanical strength of downhole magnetic source and RMRS magnetic sub was analysized. The calculated and experimental results show that, compared with RMRS magnetic sub, the designed downhole magnetic source can reduce effects on the whipstocking capability of hottom hole assembly to facilitate eontrol of wellbore trajectory.
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