Russian multilobe PDMs compete against rotary, turbodrills

Multilobe positive displacement motors (PDM) now compete against rotary and turbodrills in Russia's drilling sector, with promising prospects for worldwide applications.This technology, first developed by the Scientific Production Association of Drilling Techniques (VNIIBT, Moscow) in the 1960s and 1970s, incorporates two or more helical bends along the rotor and stator where the transverse cross sections are defined by cycloidal curves. Click here to enlarge imageIn contrast, the more traditional Moineau design employs a single helical bend, geometrically portrayed by a circular rotor cross-section, along the power section. Click here to enlarge imageIn the 1980s and 1990s, VNIIBT...

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