Design And Simulation Test Of A Pushing Unit Of Push-the-bit Vertical Drilling System

With the implementation of the national "three deeps and one soil" strategy and the implementation of continental scientific drilling projects,research in the oceans,polar regions,and deep parts of the earth has gradually increased,and the research direction of drilling engineering has gradually expanded into these fields.However,the following problems have also increased,and the problem of well deviation is one of the more common problems in drilling.The traditional passive anti-straightening and straightening measures adopted for vertical drilling,such as pendulum drilling tools and tower drilling tools,will have a greater iMPact on drilling efficiency.The automatic vertical drilling system has effectively solved the practice of sacrificing the weight-onbit for vertical drilling in the traditional anti-straightening and straightening technical measures to a certain extent,and can effectively improve the drilling efficiency and safety to a certain extent.Deep geological drilling,as a key means of deep formation detection,also faces the problem of well deviation.However,since it is only rented and not sold abroad,the domestic is not yet mature,and the existing vertical drilling systems are basically unable to meet the application requirements of deep geological drilling,so there is an urgent need to develop a small diameter coring vertical drilling system.As the main part of the vertical drilling system,the pushing mechanism is particularly important for the reasonable design and performance testing of the pushing mechanism in the early stage of the development of the vertical drilling system.This article innovatively designed the small-diameter core-pushing mechanism using the principle of seal-pushing.The mechanism can meet the needs of small diameter and coring in deep geological drilling.The principle of deflection correction of the deflection mechanism is explained,and the main components are designed and checked.The result of checking and analysis shows that the pushing mechanism can theoretically meet the requirements of underground work.According to its working environment,the force analysis is carried out,and its thrust force and its influencing factors are analyzed,so as to provide a theoretical basis for the subsequent performance test of the thrust mechanism.In order to test the performance of the thrusting mechanism in the early stage of the development of the vertical drilling system,this paper designs a set of testing mechanism for the thrusting mechanism to verify the feasibility of the performance of the thrusting mechanism.The design and description of the main components of the test system are carried out,and the design,selection and verification of each part of the test system are carried out.At the same time,the feasibility of the test system is initially verified.The results show that the system has achieved the design goals This has laid the foundation for the next step of the analysis and evaluation of the push mechanism.At the same time,the test system was used to test the performance of the pushing mechanism,and the correlation curves of pushing force,leakage and response were obtained,and the test results were analyzed.The analysis results show that the pushing mechanism has reached the design goal and can be well applied to deep geological drilling,which has laid a solid foundation for the later development of the vertical drilling system.