BH-VDT3000垂直钻井系统研制与现场试验

Development and Field Test of BH-VDT 3000 Vertical Drilling System

  • 摘要: 自动垂直钻井系统是直井防斜打快专用系统和高端钻井装备。针对BH-VDT3000垂直钻井系统研制过程中遇到的技术问题,利用平衡趋势造斜率预测方法分析了影响BH-VDT3000垂直钻井系统纠斜能力的因素及影响规律,系统分析了BH-VDT3000第一代样机现场试验失败的原因,给出了其第二代样机的结构、钻具组合及钻进参数优化方案,并进行了现场试验。理论研究及现场试验结果表明,推靠式垂直钻井系统的钻头侧向力指向井眼低边,有利于纠斜,钻头转角指向高边,不利于纠斜,选择钻具组合与钻井参数(含推靠力)时需要平衡二者对钻进趋势的影响,否则会失去纠斜能力;BH-VDT3000垂直钻井系统直径小、刚度低,若采用与大尺寸垂直钻井系统相同的钻具组合,极有可能失去纠斜能力;整体缩短导向头长度、导向翼肋与稳定器之间距离有助于提升中等尺寸垂直钻井系统的井斜控制能力。

     

    Abstract: Automatic vertical drilling system (VDS) is a special system and high-end drilling equipment for fast vertical drilling. In view of the technical problems encountered in the development of BH-VDT 3000 of Bohai Drilling Company, the influence factors and rules of the straightening capability are predicted and analyzed by the prediction method of equilibrium trend build-up rate. The reasons to the field test failure of the first prototype are comprehensively analyzed, and then the optimization scheme of the structure, bottom-hole assembly (BHA) and drilling parameters of the second prototype and its field test results are presented. The research results have shown that the bit lateral force of the push-back vertical drilling system points to the low side of the borehole (it is conducive to straightening) and the bit tilt angle points to the high side (it is unfavorable to straightening). Their influences on the drilling trend should be balanced when selecting the BHA and drilling parameters (including the push force), otherwise the straightening capability will be lost. Because the VDT 3000 has a small diameter and small stiffness, if the same BHA of large size VDT tool is used, it is very likely to lose the straightening capability. In this case, the greater the push force, the faster the inclination increase. Shortening the length of the VDT tool and the distance between the steerable rib and the upper stabilizer can improve the straightening capability of the medium-size vertical drilling system.

     

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