PDC-孕镶块混合齿钻头同轨布齿出露高差试验优选

发布时间：2019-01-18 10:39

【摘要】：PDC-孕镶块混合齿钻头具有破岩效率高和使用寿命长的双重优点。设计了一种前排PDC齿与后排孕镶块同轨布置的混合齿钻头进行破岩实验,探究PDC齿和孕镶块不同出露高差对破岩效率的影响,并与常规双排齿PDC钻头进行了对比。试验结果表明,当前后排齿出露高差小于1 mm时,双排齿PDC钻头破岩效率高于混合齿钻头破岩效率;当出露高差大于1 mm时,混合齿钻头破岩效率高于双排齿PDC钻头。用经过出露高差优选的全尺寸混合齿钻头和常规PDC钻头进行现场试验,结果表明混合齿钻头的平均机械钻速比常规PDC钻头的平均机械钻速提升了41.9%,单只进尺提高了36.9%。混合钻头取得了较好的现场试验效果,并为PDC-孕镶块混合齿钻头的设计提供了充分的依据。
[Abstract]:PDC- pregnancy insert mixed tooth bit has the dual advantages of high rock breaking efficiency and long service life. In this paper, a mixed tooth bit with the same rail arrangement of the front row PDC teeth and the back row pregnancy insert block is designed to carry out rock breaking experiments. The influence of the different outburst height difference between the PDC teeth and the pregnant insert block on the rock breaking efficiency is investigated, and the comparison with the conventional double row tooth PDC bit is carried out. The test results show that the rock breaking efficiency of double-row PDC bit is higher than that of mixed tooth bit when the height difference of back row tooth is less than 1 mm, and the rock breaking efficiency of mixed tooth bit is higher than that of double-row PDC bit when the height difference is more than 1 mm. Field tests were carried out with full-size mixed tooth bit and conventional PDC bit, which were selected by optimum selection of exposed height difference. The results show that the average mechanical drilling speed of mixed tooth bit is 41.9 higher than that of conventional PDC bit. A single ruler increases the size by 36.9. The hybrid bit has obtained better field test results and provided sufficient basis for the design of PDC- pregnancy insert bit.
【作者单位】：中国石油大学石油工程学院;
【基金】：国家重大专项(“十三五”计划项目)“海上油气田关键工程技术”,子课题“岩石研磨性评价及钻头磨损方程研究”(编号:2016ZX05033-004-006) 国家级大学生创新训练资助项目
【分类号】：TE921.1

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