HFC475
双弧形冠部，渐开线布齿，内外金刚石保径，一种是水道设置在内保径处，使径齿获得充分冷却和清洗；另一种是密闭水道设置，减少泥浆对岩芯的侵蚀，适用于软到中硬地层，是适用性较广的取心钻头之一。
The bit is featured with arc crown profile, evaluate cutter placement, diamond ID&OD gage, and Surface-discharge wateways or set-on-ID-gage fluid course which ensures good cooling and cleaning of cutters on gage. It allows to be used in a wide bariety of formations, especially in soft of medium hard ones.
钻头尺寸（in） BIT SIZE(in) | 钻头参数SPECIFICATION |
液流面积（in²） TFA（in²） | 保径长度（mm） GAGE LENGTH(mm) | 取心筒尺寸（in） API CONNECTION(in) |
5-1/2 | 0.30-0.80 | 30 | 4-1/2×2-5/8 |
6 | 0.30-0.80 | 30 | 4-3/4×2-5/8 |
8-1/2 | 0.6-1.20 | 45 | 6-3/4×4 |
推荐钻井参数MENDED OPERRATION PARAMETERS |
排量HYDRAULIC FLOWRATE | 转速RITATION SPEED | 钻压WIGHT ON BIT |
(1/s) | (gpm) | (rpm) | (KN) | (Klbs) |
10-15 | 160-240 | 60-500 | 45-90 | 10-20 |
10-15 | 160-240 | 60-500 | 45-90 | 10-20 |
22-35 | 350-550 | 60-500 | 75-120 | 15-25 |
