作　　者： (陈长青）; (王显林）; (李毅平）; (张德旺）; (王青林）; (张晓慧）; (李德伟）;

机构地区： 渤海石油装备制造有限公司渤海能克钻杆公司,河北青县062658

出　　处： 《石油矿场机械》 2017年第2期74-77,共4页

摘　　要： 针对煤层气钻井井眼小、曲率大、煤层松散的特点,提出煤层气钻井专用钻杆的设计思路。通过减小接头外径、采用接头与管体等径设计,增大了井眼环空间隙,提升了煤层钻井颗粒的携带能力,提高了井壁稳定性;通过1∶16的锥度设计、非对称牙型角设计、减小螺纹牙高、增大螺纹牙根圆角半径、在双台肩结构基础上增加公接头大端长度,降低了螺纹应力集中,研制出101.6mm高抗扭、高抗疲劳的煤层气钻井专用钻杆。在郑试1平-5H井使用效果良好,在定向造斜和水平钻井过程中均表现优良的使用性能。 Since CBM drilling has the characteris seam, the design nular clearance, of borehole wall idea of CBM drilling special dril improved coal seam drilling parti tics of small hole, big curvature, and 1oo 1 pipe was put forward. It enlarged boreh cles carrying capacity,and improved the s by reducing joint diameter,using the ameter. It reduced the thread of stress concentration metric tooth type angle, decreasing the height PIN cylinder length on the basis of structure pipe was developed with high torque and high drilling special drill pipe was well used in Zhe process of directional deflection and horizonta

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