Method and apparatus for rotary drill testing |
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| 申请号 | US3782190D | 申请日 | 1972-08-03 | 公开(公告)号 | US3782190A | 公开(公告)日 | 1974-01-01 |
| 申请人 | TEXACO INC; | 发明人 | PITTMAN R; | ||||
| 摘要 | Rotary drilling method and apparatus for indicating incipient roller cone bearing failure of a bit, or similar downhole conditions. Use is made of signals representing the torque being applied and the weight on the bit, both during drilling, while a constant that is proportional to bit diameter is included in determining the ratio of torque to weight times diameter. | ||||||
| 权利要求 | 1. Method for monitoring a rotary drilling parameter to indicate incipient bit roller-cone bearing failure or the like, comprising measuring the surface torque applied to rotate said bit, measuring the weight on said bit during rotation thereof, and dividing said measured torque by said weight in order to determine when the resulting ratio increases non-linearly. 2. Method according to claim 1, wherein said step of weight measurement includes multiplying by the diameter of said bit, and said step of dividing includes the product of said weight times the diameter as the divisor. 3. In rotary drilling a system for determining incipient bit failure, comprising in combination a bit, a rotary table for driving said bit in rotation, means for measuring the surface torque being applied to said bit during drilling, means for measuring the weight on said bit during drilling, and means for dividing said torque measurement by said weight measurement to indicate a parameter dependent upon the resistance to rotation of said bit. 4. In rotary drilling according to claim 3, a system wherein said bit is roller-cone type having roller-cone beaRings and said failure is a roller-cone bearing. 5. In rotary drilling according to claim 4, a system wherein said dividing means comprises electrical analog means. 6. In rotary drilling according to claim 5, a system wherein said dividing means comprises electronic circuit means. |
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