4Cannon E,Watson R A . Review of air and gas drilling[R]. SPE 703,1956.
5Hower W F, McLaughlin C,Ramos J, et al. Water can be controlled in air and gas drilllng[R] SPE 1099,1958.
6Supon S B,Adewumi M A, Fairchild N. Measurement and analysis of the pressure drop in a vertical annulus in a simulated air drilling operation[R]. SPE 170:39,1987.
7Moore C L,Lafave V A. Air and gas drilling[J]. Journal of Pe troleum Technology, 1956,8(2) : 15-16.