Petroleum engineer international - Vol. 53, No. 3 (Mar. 1981) ; 180 p.

Deep wells, costs at record levels in 1980 / Rich Mcnally -- Drillers topple ultradeep totals -- Deep well map -- Will demand outstrip supply in'81? / Steven D. Moore -- Modern production risers- Part 6 / George W. Morgan -- USSR improves drilling record / L.N. Shadrin -- Hand-held calculators augment optimized drilling programs- Part 4 / Ben Siegel -- Well completions and workovers - Part 12 / L. Douglas Patton -- Straight- hole turbodrilling gains favor in the U.S. / Steven D. Moore -- Charts help avoid vibration problems / Staff Report -- International land rig locator.

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