Shaffer Inc. recently completed construction of a multimillion dollar subsea drilling system for Caspmorneftegas, an operating company in the Republic of Azerbaijan. The subsea stack will be installed on the semisubmersible drilling rig Shelf 7 currently under construction in Astrakan in the Soviet Union. Shelf 7 will drill wells in the Caspian Sea, one of the most prolific production areas in the Soviet Union. The main components of the 42-ft tall equipment stack are two 18 3/4-in., 10,000-psi, double-ram Shaffer model SL blowout preventers (BOPs); two 18 3/4-in., 5,000-psi Spherical BOPS; the connectors; and the flexjoint (Fig. 1). ...

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