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连续油管可展开侧钻系统的一个主要优点在于,它可以在有限的井筒条件下在套管上磨铣窗口。造斜器可以在不压井条件下展开,而不需要移动完井设备,因此省去修井机和加重压井液。该侧钻系统可以在电力线或者连续油管上展开,因此更适合于有限的井筒路径,且可以在井下开窗。本文全面论述了采用连续油管和电力线提升方式实现套管开窗的新的造斜系统。同时列举了在使用连续油管进行造斜器定位和使用连续油管修井电动机进行开窗磨铣方面具有代表性的两个实例,在实例中对一般工序和工具选择标准进行了说明。两个实例表明:利用连续油管铣鞋和电动机进行套管开窗可以节省钻机费用;利用不压井修井方法进行造斜器定位具有较好的经济性。
One of the major advantages of a coiled tubing deployable sidetracking system is that it mills the window on the sleeve under limited wellbore conditions. The whipstock can be deployed under no-kill conditions without the need to move the completion equipment, thus eliminating the need for workover rigs and heavier kill fluids. The sidetracking system can be deployed on power lines or coiled tubing and is therefore more suitable for a limited borehole path and can be windowed downhole. This paper presents a comprehensive discussion of a new crook system that uses coiled tubing and power line lift to achieve casing windowing. Also listed are two examples of co-ordinate positioning of cots using coiled tubing and window-dressing with coiled tubing workover motors. Examples of common process and tool selection criteria are described. Two examples show that the cost of drilling rig can be saved by using the coiled tubing milling shoe and the motor for casing window opening. It is more economical to use whipstocking method to make the whipstocking position.