发明名称 |
ROLLER-TYPE DRILLING BIT |
摘要 |
FIELD: mining industry. SUBSTANCE: this drilling bit is used for secondary opening of productive beds with going out of producing pipe strings of earlier drilled bore-holes, and it also used for acquiring curvature at drilling slant bore-holes. Roller-type drilling bit has rock-crushing teeth. Cutting edge of teeth 15 in peripheral rim of main cone of rolling cutter protrudes in radial direction above surface of inverted cone 10 of rolling cutters by value lying within interval of l<SB>1</SB> = 0.01-0.03 of drilling bit diameter D. Edge of teeth 15 protrudes above cutting edge of teeth of inverted cone by value of l<SB>3</SB> = 0.01-0.03 D. Edge of teeth 15 protrudes above lip 2 of lug by value of l<SB>q</SB> = 0.02-0.05 D. Axes of teeth 15 at moment of contact with rock create angle with bit axis within interval of alpha = 45-75 deg. Aforesaid embodiment of roller-type drilling bit improves efficiency of bit operation in initiating drilling of bore-holes from earlier drilled bore-holes and at acquiring curvature in drilling slant bore-holes. EFFECT: higher efficiency. 1 dwg
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申请公布号 |
RU2130109(C1) |
申请公布日期 |
1999.05.10 |
申请号 |
RU19970112578 |
申请日期 |
1997.07.22 |
申请人 |
BRAZHENTSEV VLADIMIR PAVLOVICH;BRAZHENTSEV ANDREJ VLADIMIROVICH;KUSOV ANDREJ EVGEN'EVICH;BRAZHENTSEV SERGEJ VLADIMIROVICH |
发明人 |
BRAZHENTSEV VLADIMIR PAVLOVICH;BRAZHENTSEV ANDREJ VLADIMIROVICH;KUSOV ANDREJ EVGEN'EVICH;BRAZHENTSEV SERGEJ VLADIMIROVICH |
分类号 |
E21B10/16;(IPC1-7):E21B10/16 |
主分类号 |
E21B10/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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