This is normal for the use of the drill bit. Increase the evaluation description of the reason for the tripping. The representation methods of cone bits are CM and ZT, while the representation methods of PDC bits are MP and PL. Tripping has a great impact on the evaluation and analysis of whether wholesale injection syringe mould the drill bit can continue to be used and replaced. /E0 means the seal is effective, /F0 means the seal is invalid ( fruitless). The expression method in the IADC-API standard is adopted, and the English abbreviation is used to indicate the seal wear of the sealed bearing drill bit bearing. Therefore, it is recommended that the bearing wear evaluation method item: Increase the description of the evaluation of the service life of the sealed bearing drill bit bearing. In the roller cone bit wear evaluation standard, only the evaluation of the bearing wear life of the non-sealed bearing bit is specified, while for the sealed bearing bit, the evaluation method of the bearing service life degree is not specified. The evaluation description of sealed bearings should be added in the evaluation of bearing wear items.. For example, when the drill bit is used in the later stage, the ROP will decrease and the drilling cost will increase, it is necessary to trip and replace the drill bit. However, in drilling operations, there are many reasons for tripping.The code designation method of the passivation feature and position in the current two standards is not very intuitive, and some Chinese characters are omitted, such as: nozzle falling off, abbreviated as/mouth off: ZT0; the second is the description of cone bit and PDC bit The code designation method is not uniform, such as cone wear and nozzle falling off. They are all in Chinese Pinyin, and the same method is used to represent the same A project, but the results described by the two standards are different, and the IADC-API standard uses WT and LN English abbreviations (weartooth and lostnozzle) to uniformly express the wear and passivation characteristics of roller bit and PDC bit, achieving a simplified and unified purpose
