| With the unprecedented increase in demand for oil products at home and abroad as well as the rapid development of oil drilling industry,single screw drilling tools have gradually replaced other types of down hole power drilling tools,and became the down hole power drilling tools that people use most in the process of oil drilling today.Large-size single screw drilling tools could generates high displacement and larger output torque,so it makes the buildup of complex terrain of the cluster wells easy.So Large-size single screw drilling tools gradually draw the attentions of the relevant researchers.The design of the most frequently used outer equidistant molded lines of curtate hypocycloid are elaborated firstly and the selection and calculation of the structure parameter of screw-liner pair are completed.The whole structure design of 244 single screw drilling tools is completed.Single screw drilling tools include bypass-valve assy,drop-proof assy,single screw motor assy,cardan shaft assy and transmission shaft assy.The calculation of structure parameters of single screw drilling tools,the model selection of cardan shaft assy and the calculation of the biggest change Angle are completed.The structure design scheme of each assy is completed and the design drawings of key parts of each assy are gave.The strength check and reliability analysis of the transmission shaft assy and the strength check and fatigue life calculation of the cardan shaft assy are completed.The stator bushing of Single screw drilling tools are made of rubber material,and the rubber stator is easily to failed because of the complicated working environment wiht high temperature and high pressure.It analyses the processing technology of the rubber stator,and finite element analyses the the rubber when it is in different temperature fields and pressure fields,then we will discover the law of the displacement of the internal curve changes of the rubber stator.Study the the law of the displacement of the internal curve changes of the rubber stator when the rubber stator is in the real working environment with a certain interference and certain temperature and certain pressure. |
