王建军, 张绍槐, 狄勤丰. 塞平-1井所用单弯螺杆动力钻具自锁现象分析[J]. 石油钻采工艺, 1995, 17(2): 12-16. DOI: 10.3969/j.issn.1000-7393.1995.02.003
引用本文: 王建军, 张绍槐, 狄勤丰. 塞平-1井所用单弯螺杆动力钻具自锁现象分析[J]. 石油钻采工艺, 1995, 17(2): 12-16. DOI: 10.3969/j.issn.1000-7393.1995.02.003
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Wang Jianjun, Zhang Shaohuai, Di Qinfeng. ANALYZING SELF-LOCKING PHENOMENON OF PDM(POSITIVE DISPLALEMENT MOTOR) WITH BENT SUB IN SAIPING 1 WELL[J]. Oil Drilling & Production Technology, 1995, 17(2): 12-16. DOI: 10.3969/j.issn.1000-7393.1995.02.003
Citation: Wang Jianjun, Zhang Shaohuai, Di Qinfeng. ANALYZING SELF-LOCKING PHENOMENON OF PDM(POSITIVE DISPLALEMENT MOTOR) WITH BENT SUB IN SAIPING 1 WELL[J]. Oil Drilling & Production Technology, 1995, 17(2): 12-16. DOI: 10.3969/j.issn.1000-7393.1995.02.003
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塞平-1井所用单弯螺杆动力钻具自锁现象分析

ANALYZING SELF-LOCKING PHENOMENON OF PDM(POSITIVE DISPLALEMENT MOTOR) WITH BENT SUB IN SAIPING 1 WELL

    摘要
  • 摘要: 塞平-1并用1.25°单弯螺杆动力钻具造斜时,发生钻头加不上钻压的现象。通过理论分析,认为是扶正器自锁造成的。所谓扶正器自锁,就是扶正器相对的上下缘同时接触井壁,使所加的钻石完全被摩阻所抵消。扶正器在井眼内是否会发生自锁,主要取决于扶正器母线与井眼轴线的夹角是否大于自锁角。自锁角的大小主要取决于井眼直径、扶正器直径和长度。根据分析,缩短了扶正器长度,使扶正器外径以球状小斜角向本体过渡,结果克服了自锁,消除了钻头加不上钻压的现象,使塞平-1井顺利完成。

     

    Abstract: The one of troubles met during drilling Saiping 1 well is that the weight can’t forced on bit when using PDM with bent sub of 1.25 degree. Through theoretical analysis,it is believe that stabilizrs self-locking occurred during building up. The self-locking effect made the bit of weght was compietely off peted by friction and drag. The self-locking effect depend on the angle between the generatin llne of stabilizer and the akial line of borehole, if that angle larger than self - locking angle which depending on diameter of borehole and stabilirers and stabilizer’s length, According to the analyzing results, improving stabilizer’s profile and shorting its length made the self - locking effect be overcomed.

     

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