The definition of capacity of screw gerotor mechanism with manufacturing inaccuracies in the formation and deformations of the elastic stator lining
UDC: 621.674
DOI: 10.33285/1999-6934-2022-2(128)-5-12
Authors:
KOVALEVSKIY SERGEY A.
1,2,
BALDENKO FEDOR D.2
1 AMS, Moscow, Russian Federation
2 National University of Oil and Gas "Gubkin University", Moscow, Russian Federation
Keywords: screw gerotor mechanism, progressive cavity pump, capacity per revolution, rotor, stator, elastic stator lining
Annotation:
Recently, progressive cavity pumps (PCP) are becoming more widespread in the oil and gas industry, used in various technological processes in artificial lift of oil production, drilling wells and in environmental projects, the work member of which is a screw gerotor mechanism with an elastic stator lining. In theory and practice, one of the main parameters of the PCP is the capacity per revolution, the determination accuracy of which depends on the estimation of the energy characteristics of the pump and the overall efficiency in the specified operating conditions. In most cases, when calculating the PCP, the standard for positive displacement pump term "capacity per revolution" is used, the value of which confirms to the idealized dimensions of screw members of pump (rotor and stator). The article proposes a refined method for determining the capacity of PCP, based on the entire set of actual geometric parameters of the screw pair with manufacturing inaccuracies in the formation and deformations of the elastic stator lining, which can be used in the design and calculation of pump characteristics. As an example, the calculation of the actual capacity of the PCP along the axes of the forming stator rod and the data from the practice of manufacturing various work members of PCP standard sizes with single-lobe rotor are given. The estimation of the characteristics of PCP for drilling mud circulation systems has been performed.
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