Dcd Inc.

Aquatic Company

Rudolf S Alikin

Alexey G Messer

Yaroslaw S Gavrilov

Ludvig A Raihert

Abeksandr N Sorokin

Takov A Edelman

Mikhail A Gelfgat

David J Indrupskiy

Boris S Vygodskiy

Alexander M Podrazhanskiy

Sergej P Krivonenkov

An aluminum riser assembly has a plurality of riser joints connectable together to form a riser string. When upper and lower joints are assembled, clamps support auxiliary pipes for carrying hydraulic lines. A drive rotates a sleeve rotatably supported on the upper joint, and the sleeve rotates a union nut rotatably disposed on the upper joint. As the union nut rotates, it moves axially along the riser joint and threads onto the lower joint. The union nut is tightened until it engages an external collar to complete the coupling between the upper and lower riser joints. The entire process can then be repeated for additional upper riser joints to make up a riser string.

Aluminum riser assembly

A polycentric reamer having a body thrust unit and reaming unit is especially useful for locally reaming a borehole beneath a casing string. By asymmetrically positioning a reaming unit within a body formed from non-coaxial mated cylinders, superior results are achieved. These results include minimizing wear on the casing string.

Polycentric reamer

Growing community of inventors

Moscow, Russia

Rudolf S Alikin