【摘要】：根據(jù)地層性質(zhì)合理選擇或設(shè)計PDC鉆頭可以顯著提高鉆井效率。為指導(dǎo)PDC鉆頭合理選型及個性化設(shè)計,選取21只試驗鉆頭,在6種不同可鉆性級別的巖石上進(jìn)行鉆進(jìn)試驗,研究了在鉆進(jìn)不同可鉆性級別的巖石中切削齒尺寸、后傾角、布齒密度的合理取值問題。結(jié)果表明:(1)當(dāng)巖石可鉆性級別小于Ⅲ時,破巖效率隨切削齒尺寸的增大而增大;(2)當(dāng)巖石可鉆性級別大于Ⅲ時,16 mm切削齒的破巖效率最高;(3)切削齒尺寸對破巖效率產(chǎn)生不同影響規(guī)律的巖石可鉆性級值分界點(diǎn)為3.11;(4)在6種不同可鉆性級別的巖石中,隨切削齒后傾角增大,破巖效率均呈線性規(guī)律降低,但隨著巖石可鉆性級別的增大,后傾角對破巖效率的影響程度降低;(5)在不同可鉆性級別的巖石中,隨著布齒密度增大,破巖效率均呈冪函數(shù)規(guī)律降低。該研究成果為按巖石可鉆性級別合理選擇PDC鉆頭提供了依據(jù)。
[Abstract]:Reasonable selection or design of PDC bit according to formation properties can significantly improve drilling efficiency. In order to guide the reasonable selection and individualized design of PDC bit, 21 test bits were selected to carry out drilling tests on 6 kinds of rock with different drillability grades, and the cutting tooth size and backdip angle in rocks with different drillability grades were studied. The reasonable value of the density of distribution teeth. The results show that: (1) when the rock drillability level is less than 鈪，

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