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By the use of drilling records taken in oil fields in Japan, the factors affecting penetration rate of a rotary drilling were analysed. Some of the results obtained are as follows: (1) In some fields there is a relationship between load on a bit and penetration rate both for vertical wells and directional wells drilled with a vertical deviation angle of less than 40 degree. (2) In other fields there is no special relationship between bit load and penetration rate. In these fields hydraulicdoi:10.3720/japt.30.130 fatcat:3jlg373mjfdybdz36xwsdmtmlu