«Onshore and offshore oil and gas well construction»

Increasing the energy characteristics of the screw positive displacement motor (PDM) due to stator teeth reinforcement by metal inserts

UDC: 621.3.043.2-043.84:622.243.92.05
DOI: 10.33285/0130-3872-2022-1(349)-29-34

Authors:

¹ Perm National Research Polytechnic University, Perm, Russia

Keywords: screw positive displacement (PDM) motor, gerotor mechanism, reinforced stator, insert, rubber, bending stiffness, energy characteristic, pressure, technology

Annotation:

The article considers the design features and manufacturing technology of the main unit of the screw positive displacement motor (PDM) – a multi-way screw gerotor mechanism, which is a planetary gear transmission of internal cycloidal gearing with a difference in the number of the stator and rotor teeth equal to one. It is shown that a large deformation of rubber, insufficient bending stiffness of the stator rubber teeth lead to flushing fluid leakage and PDM energy characteristics decrease. Large cyclic deformations of rubber teeth that occur during the PDM operation, poor thermal conductivity of rubber lead to its overheating, decrease of physical-mechanical properties and PDM torque and power. It is shown that it is possible to increase the energy characteristics of the screw positive displacement (PDM) motor by reinforcing the stator rubber teeth. Three options for the stator teeth reinforcement, such as the use of the monolithic stator body with internal helical teeth, installation of a thin-walled hydro-stamped shell and metal insertsin the stator housing, are considered. The most preferred method of the stator reinforcement is to install metal inserts in the stator housing. The design and manufacturing technology of the stator, reinforced by metal inserts for PDM in the size of 240 mm, have been developed, the geometric parameters of the gerotor mechanism and the indicators of the PDM power characteristics have been selected and calculated. It has been proved that the use of the gerotor mechanism new design will increase the energy characteristics of the screw positive displacement (PDM) motor by 20 %.

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