Petroleum engineer international - Vol. 57, No. 4 (Apr. 1985) ; 134 p.

Conoco stops annular gas flow with special cement / Don Stehle -- Gas lift: how to make the most of it, part 1 / Richard F. Keelan -- The independent's role in developing downhole technology / James F. Massey -- New method estimates well-treatment volumes / H.W Bang -- How to apply the new API adjustment for collapse resistance / Phillip D. Pattillo -- What's new ... in downhole tools and technology -- Engineers solve excess water problems in German steam drive areas / R. Mueller.

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