| Electrical Submersible Progressing Cavity Pump (ESPCP) technology has been used more and more, the technology gradually became the hot spot in the field of oil extraction industry, which attracts more and more researcher on amelioration of ESPCP.ESPCP system consists of six primary parts:down-hole electrical motor, gear reducer, coupling, PCP, frequency converter and protector. The bearing of the coupling is one of the most important components which decide lifespan of the ESPCP system. Under the limitation of some factors such as depth of down-hole, the oil viscosity, in order to improve the lifespan of the ESPCP system. Improve the lifespan and the resistant of bearing capacity in high temperature become the core content of this paper. In this paper, analyzed the reason for the failure of bearing used in production field, and bring in some other different designs from the structure of bearing. The statics analyses of different design were analyzed using finite element analysis software.The author summarized the internal and overseas situation of development about ESPCP system, summarized the main function of the bearing, and analyzed the main factors which shorted the lifespan of the system. Introduce some basic principles and knowledge of finite element analyzed software. Based on the analysis, the author replace the structure of the bearing to conical roller bearing, in order to improve the life of the bearing. Use of finite element analyzed software, assumed Liaohe oilfield production 1500 meters underground conditions, dynamics and finite element statics of the conical roller bearing at 140℃, obtain the distribute of stress-strain and the distortion. Study the relationship between half conical angle of the bearing and number of rollers and the caption of the bearing. Finally arrive the optimal results and get the production practice validation.For bearing of the ESPCP system continue study and improvement design provides ample data, and make a strong theoretical basis.
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